JP2008104073A - VoIP system - Google Patents

Abstract

When a VoIP terminal having a wireless function moves while making a call between a home network having a home device and an outside network having a public wireless device, the call is continued before and after the movement.
SOLUTION: H. O. When the terminal 1 moves under the public wireless device 5, the registration is transmitted to the call control device 4. The call control device 4 sends the H.264 to the home device 3. O. Send notifications. The in-home device 3 is H.264. O. H. O. Send implementation instructions. H. O. The rear terminal is H.264. O. When the execution instruction is received, the H. O. A switching call connection signal is transmitted to the terminal 2. H. O. The terminal 2 switches the call path before the handover to the call path after the handover established by the switching call connection signal. H. O. The terminal 2 is connected to the H.264 via the home device 3. O. A disconnect request signal is transmitted to the previous terminal, and the call path before the handover is disconnected.
[Selection] Figure 1

Description

  The present invention relates to a VoIP system.

In recent years, IP telephone terminals (VoIP terminals) using VoIP (Voice over IP) technology for packetizing voice and transmitting it on an IP (Internet Protocol) network have become widespread, and in-house VoIP terminators are installed in user premises. However, an IP telephone service has begun to be provided by installing a VoIP terminal under the subordinate. Furthermore, it is equivalent to a conventional analog cordless phone by using a home VoIP terminal device (home device) with a wireless LAN (Local Area Network) access point function and a wireless LAN compatible VoIP terminal (WiFi phone) with a wireless LAN function. It can be used. On the other hand, if the network using a public wireless LAN is expanded, it is possible to take a WiFi phone used at home and use it like a mobile phone within the radio wave range of a wireless LAN access point. It is conceivable to use the WiFi phone while moving. In this case, moving between the wireless LAN access points inside and outside the house while making a call (handover), the layer 3 (IP layer) network is different between the home network and the public wireless LAN network. The IP address is changed. In addition, a WiFi phone that has been using the IP phone service via the home device in the home uses the IP phone service in cooperation with the network side call control device directly outside the home. Therefore, if you move between a home device and a public wireless LAN access point, the call will be temporarily disconnected without being handed over, so you must manually send the call again after registering with the home device or call control device. To resume the call.
On the other hand, Patent Document 1 does not provide a control device for handover between a network side (call control device) and a base station when handing over between base stations using a PHS (Personal Handyphone System). Describes the function of the base station as means for realizing handover. Patent Document 2 proposes a technique for realizing seamless handover even when a VoIP terminal moves while making a call between networks that do not use a home device. In Patent Document 2, when performing a handover, a call partner terminal multicasts (or broadcasts) a voice packet to a neighboring base station, thereby realizing a handover with few interruptions.
Japanese Patent Laid-Open No. 11-252611 JP 2004-56336 A

  As described above, in a conventional WiFi phone, when a user moves from a home device to a public wireless LAN access point or from a public wireless LAN access point to a home device, the call is temporarily disconnected. There was a problem that. Therefore, even in such a case, it has been desired to perform handover seamlessly without interrupting the call. However, the above-described techniques of Patent Documents 1 and 2 cannot be applied to handover between a home device and a public access point.

  The present invention has been made in view of the above circumstances. The purpose of the present invention is that when a VoIP terminal having a wireless function moves between a home network having a home device and an external network having a public wireless device, An object of the present invention is to provide a VoIP system that seamlessly implements handover without disconnecting a call before and after movement.

  To achieve the above object, the present invention communicates with a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, and communicates with the call control device via an IP network. And a VoIP system comprising a VoIP terminator that communicates wirelessly with the VoIP terminal, and a radio device for performing radio access from the VoIP terminal to the IP network, wherein the VoIP terminal includes the VoIP terminator and A first communication unit that connects wirelessly; a second communication unit that wirelessly connects to the wireless device; a determination unit that determines that a wireless access destination has been changed from the VoIP termination device to the wireless device; During the call via the VoIP terminal connected to the call destination VoIP terminal connected to the IP network, the determination means When the wireless access destination is determined to be changed to the wireless device, a registration request for transmitting a registration signal in which information indicating that the movement is in progress is set to the call control device via the wireless device And a handover execution instruction signal received from the VoIP terminal apparatus via the wireless apparatus and acquired from the handover execution instruction signal to a communication destination VoIP terminal indicated by a terminal identification acquired from the handover execution instruction signal, Switching call connection activation means for transmitting a switching call connection signal in which information of a communication path between the VoIP terminator and the communication destination VoIP terminal is set and establishing a communication path with the communication destination VoIP terminal The call control device receives a registration signal from the VoIP terminal via the wireless device, and moves during a call in the registration signal. A handover notification unit configured to transmit a handover notification signal in which the terminal identification of the VoIP terminal is set to the VoIP terminal device, the VoIP terminal device transmits the handover notification from the call control device to the VoIP terminal device. A handover execution instruction in which the terminal identification of the call destination VoIP terminal and the information of the call path between the call destination VoIP terminals are set to the VoIP terminal indicated by the terminal identification acquired from the handover notification signal A handover instruction transmitting means for transmitting a signal, wherein the call destination VoIP terminal receives a switching call connection signal from the VoIP terminal, establishes a call path with the VoIP terminal, and is indicated by the received switching call connection signal Switch to the established call path with the VoIP terminator. And means, and a disconnection request means for sending a disconnection request signal for call path before the switching to the VoIP terminal through the home apparatus, a VoIP system, characterized in that.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminating device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is wirelessly connected to the VoIP terminating device. Communication means, second communication means for wirelessly connecting to the wireless device, determination means for determining that the wireless access destination has been changed from the wireless device to the VoIP terminator, and connected to the IP network During a call via the call destination VoIP terminal and the wireless device, the determination means causes the wireless access destination to be When it is determined that the terminal has been changed to a VoIP terminator, a switching call connection in which information on a call path with the call destination VoIP terminal is set as a switch path to the call destination VoIP terminal via the VoIP terminator A switching call connection activation means for transmitting a signal and establishing a voice path with the VoIP terminator, wherein the VoIP terminator receives a switching call connection signal from the VoIP terminal and communicates with the VoIP terminal A call control means for establishing a voice path with the communication destination VoIP terminal by transmitting the received switching call connection signal to the call destination VoIP terminal, and the call destination VoIP terminal includes: A switching call connection signal is received from the VoIP terminator, a voice path is established with the VoIP termination device, and is indicated by the switching path in the switching call connection signal. Switching means for switching the voice path to the VoIP terminal to the established voice path, and disconnection request means for sending a disconnection request for the voice path before the switching to the VoIP terminal. System.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminating device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is wirelessly connected to the VoIP terminating device. Communication means, second communication means for wirelessly connecting to the wireless device, determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device, and the IP network. During the call via the call destination VoIP terminal and the VoIP terminator, the determination means performs wireless access. When it is determined that the destination has been changed to the wireless device, a registration signal in which the terminal identification of the destination VoIP terminal and information indicating that a call is in progress is set to the call control device via the wireless device. A registration request means for transmitting, and receiving a switching call connection signal from the callee VoIP terminal, establishing a call path via the callee VoIP terminal and the public wireless device, A path switching means for switching a call path between the VoIP terminator indicated by a switching path to an established call path, and a call path disconnection request signal before switching to the call destination VoIP terminal via the VoIP terminator The call control device receives a registration signal from the VoIP terminal via the wireless device, and information indicating movement during a call is included in the registration signal. A handover notification signal in which the terminal identification of the call destination VoIP terminal obtained from within the registration signal is set to the VoIP termination device that terminates the call of the VoIP terminal that is the transmission source of the registration signal. The VoIP termination device receives a handover notification signal from the call control device and transmits the VoIP terminal as a switching terminal to the call destination VoIP terminal indicated by the terminal identification obtained from the handover notification signal. A handover execution instruction means for transmitting a handover execution instruction signal in which terminal identification of the terminal is set as a switching path and information on a call path with the VoIP terminal is set, and the call destination VoIP terminal performs handover from the VoIP terminal Receives the instruction signal and receives the handover execution instruction signal from the terminal Acquiring another and switching path, and transmitting a switching call connection signal in which information of the acquired switching path is set to the VoIP terminal indicated by the acquired terminal identification to establish a call path with the VoIP terminal, A VoIP system comprising switching call connection activation means for switching to a call path that establishes a call path with a VoIP termination device.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminating device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is wirelessly connected to the VoIP terminating device. Communication means, second communication means for wirelessly connecting to the wireless device, determination means for determining that the wireless access destination has been changed from the wireless device to the VoIP terminator, and connected to the IP network During a call via the call destination VoIP terminal and the wireless device, the determination means causes the wireless access destination to be A registration request for transmitting, to the VoIP terminator, a registration signal in which terminal identification of the call destination VoIP terminal and information indicating movement during a call are set when it is determined that the VoIP terminator has been changed. And a switching call connection signal transmitted from the call destination VoIP terminal via the VoIP terminator, establishing a call path with the VoIP terminator, and communicating with the call destination VoIP terminal Switching means for switching the call path to the established call path, and a disconnect request means for transmitting a call path disconnection request with the callee VoIP terminal to the callee VoIP terminal. Receives a registration signal from the VoIP terminal, and if the registration signal includes information indicating movement during a call, the terminal identification obtained from the registration signal A handover execution instruction means for transmitting a handover execution instruction signal in which the terminal identification of the VoIP terminal that is the transmission source of the registration signal is set, and a switching call connection signal from the call destination VoIP terminal. Call control means for receiving and establishing a call path with the call destination VoIP terminal, transmitting the switching call connection signal to the VoIP terminal, and establishing a call path with the VoIP terminal. The call destination VoIP terminal receives a handover execution instruction signal from the VoIP terminator, transmits a switching call connection signal to the VoIP terminator, and establishes a call path with the VoIP terminator, Characterized by comprising switching call connection activation means for switching a call path established with the VoIP terminal to an established call path. It is a VoIP system.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminating device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is wirelessly connected to the VoIP terminating device. Communication means, second communication means for wirelessly connecting to the wireless device, determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device, and the IP network. During the call via the call destination VoIP terminal and the VoIP terminator, the determination means performs wireless access. When it is determined that the destination has been changed to the wireless device, a registration signal in which a switching path indicating a call path with the call destination VoIP terminal and information indicating that a call is in progress is set, A registration request means for transmitting to the call control device via the device, a call connection signal for switching from the VoIP terminating device via the wireless device, and a call path between the VoIP terminal and the wireless device. A call established directly between the VoIP terminator and path switching means for switching a call path established with the VoIP terminator to a call path via the wireless device Disconnection request means for directly transmitting a path disconnection request to the VoIP terminator, wherein the call control device receives a registration signal from the VoIP terminal via the wireless device, A handover execution instructing unit configured to transmit a handover execution instruction signal in which terminal identification of the VoIP terminal is set to the VoIP terminal when the information indicating movement during a call is included, the VoIP terminal A handover execution instruction signal is received from the call control apparatus, and a switching call connection signal is transmitted to the VoIP terminal indicated by the terminal identification acquired from the handover execution instruction signal via the wireless apparatus, A call path activation means for switching for establishing a call path with the VoIP terminal and switching a call path already established with the VoIP terminal to a call path via the wireless device, VoIP system.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminating device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is wirelessly connected to the VoIP terminating device. Communication means, second communication means for wirelessly connecting to the wireless device, determination means for determining that the wireless access destination has been changed from the wireless device to the VoIP terminator, and connected to the IP network During a call via the call destination VoIP terminal and the wireless device, the determination means causes the wireless access destination to be Registration request means for transmitting a registration signal in which terminal identification of the call destination VoIP terminal and information indicating movement during a call are set to the VoIP termination device when it is determined that the VoIP termination device has been changed; Path switching that receives a switching call connection signal from the VoIP terminator, establishes a call path with the VoIP terminator, and switches the call path with the call destination VoIP terminal to the established call path And when the registration signal is received from the VoIP terminal and the information indicating movement during a call is included in the registration signal, the VoIP termination device transmits the registration signal to the VoIP terminal that is the transmission source of the registration signal A call connection signal for switching is transmitted, a call path is established with the VoIP terminal, and a call connection signal for switching is transmitted to the call destination VoIP terminal indicated by the registration signal A switching call connection activation means for transmitting and establishing a call path with the call destination VoIP terminal, wherein the call destination VoIP terminal receives the switching call connection signal from the VoIP terminator, and the VoIP termination A path switching means for establishing a call path with the apparatus and switching the call path established with the VoIP terminal to the established call path, and a call path disconnection request signal before switching to the VoIP terminal A VoIP system characterized by comprising: a disconnection requesting means for transmitting.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and terminates a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminal device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is connected to the VoIP terminal device wirelessly Communication means, second communication means for wirelessly connecting to the wireless device, determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device, and the IP network. During the call via the call destination VoIP terminal and the VoIP terminator, the determination means determines whether the wireless access destination is A registration request unit configured to transmit a registration signal in which information indicating that a call is in progress is set to the call control device via the wireless device when the call control device is determined to have been changed to the wireless device; A path switching means for receiving a switching call connection signal from the terminal and establishing a call path with the call control apparatus, and switching the call path with the in-home apparatus to the established call path; and the VoIP termination A disconnect request means for directly transmitting a call path disconnection request established with a device to the VoIP terminator, wherein the VoIP terminator receives a disconnect request from a VoIP terminal, Disconnecting a call path between the call control device and a call requesting device for transmitting a call path disconnection request established with the call control device to the call control device. When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, a switching call connection signal is returned, and the VoIP terminal A switching call connection activation means for establishing a call path between them, and a session change instruction means for instructing the call destination VoIP terminal to change the transmission destination of the voice media from the VoIP termination device to the VoIP terminal, The call destination VoIP terminal is a VoIP system comprising session changing means for receiving an instruction from the call control device and changing a voice media transmission destination from the VoIP terminal device to the VoIP terminal.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and terminates a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminating device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is wirelessly connected to the VoIP terminating device. Communication means, second communication means for wirelessly connecting to the wireless device, determination means for determining that the wireless access destination has been changed from the wireless device to the VoIP terminator, and connected to the IP network During a call via the call destination VoIP terminal and the wireless device, the determination means determines that the wireless access destination is the Vo When it is determined that the IP termination device has been changed, a registration signal in which a switching path indicating a call path to the call control device and information indicating movement during a call are set is transmitted to the VoIP termination device. Registration request means for transmitting to a device; receiving a switching call connection signal from the VoIP termination device; establishing a call path with the VoIP termination device; and the call control device indicated by the switching call connection A path switching means for switching a call path between the call path to the established call path, and a disconnect request means for transmitting a call path disconnection request before switching to the call control apparatus via the wireless device, When a registration signal is received from the VoIP terminal and information indicating movement during a call is included in the registration signal, the VoIP terminating device sets the terminal identification of the VoIP terminal. A handover execution instruction means for transmitting an over execution instruction signal to the call control device; and a switching call connection signal from the call control device is received, a call path is established between the call control device and the received switching A call control signal for transmitting a call connection signal to the VoIP terminal and establishing a call path with the VoIP terminal. The call control device receives a handover execution instruction signal from the VoIP termination device, and A switching call connection signal in which switching path information indicating a call path with the VoIP terminal indicated by the terminal identification read from the handover execution instruction signal is set is transmitted via the VoIP terminator, and the VoIP terminator A call connection activation means for switching to establish a call path between the VoIP terminal and the destination of the voice media from the VoIP terminal Session change instruction means for instructing the VoIP termination device to change, the call destination VoIP terminal receives an instruction from the call control device, and the voice media transmission destination is sent from the VoIP terminal to the VoIP termination device. A VoIP system comprising a session changing means for changing to

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminal device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is connected to the VoIP terminal device wirelessly The communication means, the second communication means for wirelessly connecting to the wireless device, and the wireless access destination being changed from the VoIP termination device to the wireless device, or from the wireless device to the VoIP termination device. A determination means for determining, a destination VoIP terminal connected to the IP network, and the VoIP terminator; During a call via a device, when the determination means determines that the wireless access destination has been changed to the wireless device, a registration signal in which information indicating movement during a call is set is sent to the wireless device. A registration request means for transmitting to the call control device via the wireless device and a handover execution instruction signal received from the VoIP termination device via the wireless device, and to the communication destination VoIP terminal indicated by the terminal identification obtained from the handover execution instruction signal A call connection signal for switching that sets information of a call path between the VoIP terminating device and the communication destination VoIP terminal, acquired from the handover execution instruction signal, and calls between the communication destination VoIP terminals A first switching call connection activation means for establishing a path; a call destination VoIP terminal connected to the IP network; When the determination unit determines that the wireless access destination has been changed to the VoIP terminator, the call destination VoIP terminal is switched to the call destination VoIP terminal via the VoIP terminator as a switching path. And a second switching call connection activation means for establishing a voice path with the VoIP terminator, wherein the call control device includes the VoIP terminal. When a registration signal is received from the wireless device and information indicating movement during a call is included in the registration signal, a handover notification signal in which terminal identification of the VoIP terminal is set to the VoIP terminal device The VoIP terminator receives the handover notification signal from the call control device, and receives the handover notification signal. A handover for transmitting a handover execution instruction signal in which terminal identification of the call destination VoIP terminal and information of a call path between the call destination VoIP terminals are set to the VoIP terminal indicated by the terminal identification acquired from the server notification signal An instruction transmission means and a switching call connection signal from the VoIP terminal are received to establish a voice path between the VoIP terminal, and the received switching call connection signal is transmitted to the call destination VoIP terminal. Call control means for establishing a voice path with the VoIP terminal, and the destination VoIP terminal receives the switching call connection signal and establishes a communication path with the transmission source of the switching call connection signal A switching means for switching the switching path indicated by the switching call connection signal to the established call path, and a call path disconnection request signal before switching to establish the call path before switching. A VoIP system comprising a disconnection request means for transmitting to a destination.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminating device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is wirelessly connected to the VoIP terminating device. The communication means, the second communication means for wirelessly connecting to the wireless device, and the wireless access destination being changed from the VoIP termination device to the wireless device, or from the wireless device to the VoIP termination device. A determination means for determining, and the determination means during a call with a destination VoIP terminal connected to the IP network; When it is determined that the wireless access destination has been changed, the registration signal that sets the terminal identification of the call destination VoIP terminal and information indicating that the call is in progress is sent to the wireless device of the changed access destination. Registration request means for transmitting to the call control device or the changed access destination VoIP terminal device and the switching call connection signal, and establishing a call path with the switching call connection signal source And a path switching means for switching the already established call path to the newly established call path, and a disconnect request means for transmitting a call path disconnection request signal before the switching to the establishment destination of the call path before the switching. The call control device receives a registration signal from the VoIP terminal via the wireless device, and the registration signal includes information indicating movement during a call in the registration signal. Sending A handover notification unit configured to transmit a handover notification signal in which the terminal identification of the call destination VoIP terminal acquired from within the registration signal is transmitted to the VoIP termination device that terminates the call of the original VoIP terminal; The terminating device receives the handover notification signal from the call control device, and transmits the terminal identification of the VoIP terminal as the switching terminal to the call destination VoIP terminal indicated by the terminal identification acquired from the handover notification signal, and the VoIP as the switching path. First handover execution instruction means for transmitting a handover execution instruction signal in which information of a call path with the terminal is set, and information indicating movement during a call in the registration signal received from the VoIP terminal Destination is indicated by the terminal identification obtained from the registration signal a second handover execution instruction means for transmitting a handover execution instruction signal in which the terminal identification of the VoIP terminal that is the transmission source of the registration signal is set to the oIP terminal; and the switching call connection signal from the destination VoIP terminal. And a call control means for establishing a call path with the call destination VoIP terminal, transmitting the switching call connection signal to the VoIP terminal, and establishing a call path with the VoIP terminal, The destination VoIP terminal receives a handover execution instruction signal from the VoIP termination apparatus while establishing a call path with the VoIP termination apparatus, acquires a terminal identification and a switching path from the handover execution instruction signal, and acquires the acquired terminal identification A switching call connection signal in which the acquired switching path information is set is transmitted to the VoIP terminal indicated by A first switching call connection activation means for establishing a call path with a terminal and switching the call path with the VoIP terminating device to the established call path, and during establishment of a call path with the VoIP terminal, A handover execution instruction signal is received from the VoIP terminator, a call connection signal for switching is transmitted to the VoIP terminator, a call path with the VoIP terminator is established, and established with the VoIP terminal A VoIP system, comprising: a second switching call connection activation means for switching a previously established call path to an established call path.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and proxies a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminal device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is connected to the VoIP terminal device wirelessly The communication means, the second communication means for wirelessly connecting to the wireless device, and the wireless access destination being changed from the VoIP termination device to the wireless device, or from the wireless device to the VoIP termination device. A determination means for determining, a destination VoIP terminal connected to the IP network, and the VoIP terminator; During a call via a device, when the determination means determines that the wireless access destination has been changed to the wireless device, a switching path indicating a call path with the callee VoIP terminal and a call are in progress A first registration request means for transmitting a registration signal set with information indicating that to the call control device via the wireless device, and a switching call connection signal from the VoIP terminating device via the wireless device. Receive and establish a call path via the wireless device with the VoIP terminal, and establish directly between the path switching means for switching the established call path to the established call path and the VoIP terminating device A disconnect request means for directly transmitting a disconnection request for the call path that has been made to the VoIP terminator, a call destination VoIP terminal connected to the IP network, and the wireless device During a call, when the determination means determines that the wireless access destination has been changed to the VoIP termination device, a registration signal in which terminal identification of the call destination VoIP terminal and information indicating movement during a call are set And a second registration request means for transmitting to the VoIP termination device, wherein the call control device receives a registration signal from the VoIP terminal via the wireless device, and moves during the call in the registration signal. And a handover execution instruction means for transmitting a handover execution instruction signal in which terminal identification of the VoIP terminal is set to the VoIP terminal device when the information indicating the information is included, and the VoIP terminal device performs handover from the call control device The VoIP terminal indicated by the terminal identification obtained from the execution instruction signal is received from the handover execution instruction signal via the wireless device A call connection signal for switching is transmitted to establish a call path with the VoIP terminal via the wireless device, and a call path that has already been established with the VoIP terminal is communicated via the wireless device. When the registration signal is received from the VoIP terminal and the information indicating movement during a call is included in the registration signal when the registration signal is received from the VoIP terminal, A switching call connection signal is transmitted to the VoIP terminal to establish a call path with the VoIP terminal, and a switching call connection signal is transmitted to the call destination VoIP terminal indicated by the registration signal. A second switching call connection activation means for establishing a call path with the called VoIP terminal, wherein the called VoIP terminal receives the switching call connection signal from the VoIP terminator, and A path switching means for establishing a call path with the IP termination device and switching the call path established with the VoIP terminal to the established call path; and disconnecting the call path before switching to the VoIP terminal A VoIP system comprising a disconnection requesting means for transmitting a request signal.

  The present invention also provides a VoIP (Voice over IP) terminal, a call control device that performs VoIP call control and terminates a call path, communicates with the call control device via an IP network, and the VoIP terminal A VoIP system comprising a VoIP terminating device that communicates wirelessly and a wireless device that performs wireless access from the VoIP terminal to the IP network, wherein the VoIP terminal is wirelessly connected to the VoIP terminating device. The communication means, the second communication means for wirelessly connecting to the wireless device, and the wireless access destination being changed from the VoIP termination device to the wireless device, or from the wireless device to the VoIP termination device. A determination means for determining, a destination VoIP terminal connected to the IP network, and the VoIP terminator; If the determination means determines that the wireless access destination has been changed to the wireless device during a call, a registration signal in which information indicating that the call is in progress is set via the wireless device. The wireless access destination is changed to the VoIP terminator by the determination means during a call via the first registration request means to be transmitted to the control device and the destination VoIP terminal connected to the IP network and the wireless device. A second signal for transmitting, to the VoIP terminating device, a registration signal in which a switching path indicating a call path with the call control device and information indicating movement during a call are set. Receiving a switching call connection signal, establishing a call path between the switching call connection signal and the source of the switching call connection signal, and switching the already established call path to a newly established call path. Cut off Path switching means for switching, and disconnection request means for transmitting a call path disconnection request before switching to the establishment destination of the call path before switching, wherein the VoIP terminator receives a disconnection request from a VoIP terminal, A disconnect request means for disconnecting a call path with the VoIP terminal and transmitting a call path disconnect request established with the call control apparatus to the call control apparatus; and a registration signal from the VoIP terminal And a handover execution instruction means for transmitting a handover execution instruction signal in which the terminal identification of the VoIP terminal is set to the call control apparatus when the registration signal includes information indicating movement during a call. , Receiving a switching call connection signal from the call control device, establishing a call path with the call control device, and sending the received switching call connection signal to the VoIP terminal Call control means for transmitting and establishing a call path with the VoIP terminal, wherein the call control device receives a registration signal from the VoIP terminal via the wireless device, and makes a call within the registration signal. A switching call connection signal that returns a switching call connection signal and establishes a call path with the VoIP terminal, and a VoIP termination device. A switching call connection signal in which switching path information indicating a call path with the VoIP terminal indicated by the terminal identification read out from the handover execution instruction signal is received is set to the VoIP terminating device. A second switching call connection activation means for establishing a call path with the VoIP terminator, and a call for establishing a voice media transmission destination to the call destination VoIP terminal. Session change instruction means for instructing to change to a speech path, and the call destination VoIP terminal includes session change means for changing a voice media transmission destination according to an instruction from the call control device. It is a VoIP system.

According to the present invention, in a VoIP system that uses a WiFi phone, which has been used in the same manner as a conventional analog cordless phone, even outside a home where a public wireless LAN or the like is provided, from home to outside or home Even when the user moves from outside to the home while making a call, the call can be handed over without interruption.
Further, the home is not limited to the use of a private home, but can be applied to a handover with a public wireless LAN even in a private network of a company in which a home device such as IP-PBX is installed. .

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an overall configuration of a VoIP system according to an embodiment of the present invention.
In the figure, a call control device 4 and a public wireless device 5 (wireless device) are installed in a VoIP network N which is a VoIP (Voice over IP) provider network. In the user's home, a home device 3 (VoIP termination device) connected to the VoIP network N is installed.

  H. held by the user. O. (Handover) The terminal 1 is a VoIP terminal that performs a handover, for example, a WiFi (Wireless Fidelity) phone. The WiFi phone is a VoIP terminal having a wireless function for supporting IP communication, for example, a wireless LAN function. O. It is a terminal. H. O. The terminal 1 establishes a call via a home device 3 connected wirelessly at home, and establishes a call via a public wireless device 5 connected wirelessly such as a public wireless LAN outside the home. Here, the H.264 before handover is performed. O. The terminal 1 is the “previous H.O. terminal”, and the H.O. O. The terminal 1 is referred to as “HO post terminal”. H. O. H. O. The rear terminal is physically the same terminal and has the same telephone number, but network information such as an IP address is different. H. O. Between the terminal 1 and the home device 3; O. As the radio between the terminal 1 and the public radio apparatus 5, a radio standard supporting IP communication can be applied in addition to a radio LAN defined by IEEE802.11.

H. O. Terminal 2 is H.264. O. It is a gateway device with a VoIP terminal of a communication destination communicating with the terminal 1 or a network other than the VoIP network (such as a PSTN network).
The in-home device 3 is an in-home VoIP terminal device, and is installed in the user's home as a base point of the carrier network and the home network. The in-home device 3 is a device that terminates signals related to VoIP call control and media, and interworks to the carrier network (VoIP network N) side and the home network side (HO terminal 1), respectively. It has a wireless function for supporting communication, such as a wireless LAN function. The in-home device 3 can terminate both the call path and the voice stream. When the subordinate VoIP terminal is within the radio wave range of the wireless function, that is, within its own network, both the call path and the voice stream are available. Terminate.

The call control device 4 is a device for controlling a VoIP call control signal, and is installed in a carrier network of the VoIP network N. In the present embodiment, it is assumed that SIP (Session Initiation Protocol) is used as the VoIP protocol. The call control device 4 includes a device that terminates a call path (referred to as B2BUA (Back-to-Back User Agent) in SIP) and a device that does not terminate a call path (proxy). Also, whether or not the VoIP terminal can make a call is managed by registration from the VoIP terminal or the in-home device 3, and has mapping information of a line contract number, a dial-in number, and an IP address. This IP address is H.264. O. When the terminal 1 is under the home device 3, the IP address of the home device 3 is indicated. O. When the terminal 1 is under the public wireless device 5, O. The IP address of the terminal 1 is shown.
The public wireless device 5 is a wireless device installed to provide a wireless service that supports IP communication in the public. A typical example is a public wireless LAN access point (hot spot). The public wireless device 5 only routes the call control signal and does not terminate it.

  The call path is a unit for managing calls (sessions) between devices (user agents), and is called a dialog in SIP. Moreover, as a telephone number used in this embodiment, there is a dial-in number that can be assigned to a subordinate VoIP terminal in addition to the line contract number that the in-home device 3 has. The VoIP terminal can use the dial-in number even outside the home.

  In FIG. O. The terminal 1 stores its own IP address “address X” and extension number “1111” when the terminal 1 is under the home device 3. In addition, the in-home device 3 is connected to the H.264 network under its network. O. The extension number “1111” of the terminal 1, the SIP URL “03-XXXX-XXXX @ yyy”, and the IP address “address X” are stored in association with each other. The in-home device 3 has the IP address “address X” of H.264. O. When the extension number “1111” is received from the terminal 1, it is converted to the SIP URL “03-XXXX-XXXX @ yyy” corresponding to this extension number and transmitted to the VoIP network N side, and the SIP URL “ 03-XXXX-XXXX @ yyy "is converted to the extension number" 1111 " O. Transmit to terminal 1. Here, the dial-in number is the number before the domain of the SIP URL, that is, “03-XXXX-XXXX”. The in-home device 3 is H.264. O. Regardless of the timing of registration from the terminal 1, for example, when the in-home device 3 is powered on, the IP address “address Y” and the H. O. A “registration” signal in which the SIP URL “03-XXXX-XXXX @ yyy” corresponding to the extension number “1111” of the terminal 1 is set is transmitted to the call control device 4. Thus, the call control device 4 holds the received IP address “address Y” of the in-home device 3 and the SIP URL “03-XXXX-XXXX @ yyy” in association with each other. H. O. By receiving from the terminal 1 a “registration” signal in which the IP address of the terminal and the extension number “1111” are set, the in-home device 3 receives the H.P. O. Recognizes that the terminal 1 is under its control.

  H. O. When the terminal 1 is under the public wireless device 5, O. The terminal 1 stores its own IP address “address Z” and the SIP URL “03-XXXX-XXXX @ zzzz” in the public wireless LAN. Although the domain name is different from that in the case of being in the home device 3, the dial-in number is a number up to the domain of the SIP URL. O. This is the same number as the incoming call when the terminal 1 is under the home device 3. The IP address in the wireless LAN under the public wireless device 5 may be assigned from a DHCP (Dynamic Host Configuration Protocol) server (not shown) on the VoIP network N when wirelessly connecting to the public wireless device 5. It may be stored in advance as an IP address to be used when wireless connection becomes possible. H. O. When the terminal 1 is connected to the public wireless LAN, the IP address “address Z” of the terminal, the dial-in number stored in advance as being used when connecting to the public wireless LAN, and the connected public wireless A “registration” signal in which “03-XXXX-XXXX @ zzz” including the domain name in the LAN is set is transmitted. The call control device 4 holds the received IP address “address Z” and the SIP URL “03-XXXX-XXXX @ zzz” in association with each other. The call control device 4 converts the address of the call control signal and the media signal by performing mutual conversion between the SIP URL and the IP address.

In this embodiment, H.264 is used. O. Terminal 1 is H.264. O. During a call with the terminal 2, when the mobile device 3 can move from outside the network area of the in-home device 3 and can communicate with the public wireless device 5, the mobile device can move from outside the service area of the public wireless device 5 and can communicate with the home device 3 In this case, the handover is performed seamlessly, that is, without disconnecting the call.
In the following, H.C. O. When the terminal 1 moves during a call, O. A case where the terminal 1 starts handover is described as the first embodiment. O. The case where the terminal 2 starts handover is the second embodiment, the case where the in-home device 3 starts handover is the third embodiment, and the case where the call control device 4 starts handover is the fourth embodiment. Describe.

<First Embodiment>
In the first embodiment, H.264. O. When the terminal 1 moves during a call, O. The terminal 1 instructs execution of the handover. H. of FIG. O. Terminal 1, H. O. The terminal 2, the in-home device 3, and the call control device 4 are respectively connected to the H.264. O. Terminal 1a, H. O. The terminal 2a, home device 3a, and call control device 4a are assumed. In this embodiment, the H.264 before the handover is performed. O. Terminal 1a is connected to H.264. O. Previous terminal, H. O. The terminal 1a is described as a terminal after handover.

FIG. 2 shows the H.264 according to this embodiment. O. The functional block diagram of the terminal 1a is shown.
In FIG. O. The terminal 1a includes a control unit 110, a first communication unit 120, a second communication unit 130, a determination unit 140, and a call control unit 150a.
The control unit 110 includes a central processing unit (CPU) and various memories, and controls each unit, temporarily stores data, transfers data, and the like. The first communication unit 120 performs wireless communication with the in-home device 3a. The second communication means 130 performs wireless communication with the public wireless device 4 of the VoIP network N. For the wireless communication, for example, a wireless LAN such as IEEE802.11 can be used. The determination unit 140 determines whether the connected network is a network under the home device 3a or the public wireless device 4.

The call control unit 150a executes VoIP call control based on an instruction input by a user or a received call control signal. The call control unit 150 a includes a first registration request unit 151, a first switching call connection activation unit 152, a second registration request unit 156, and a second switching call connection activation unit 157.
The first registration request means 151 is an H.264 subordinate to the public wireless device 5. O. As a subsequent terminal, the terminal is registered in the call control device 4a. The first switching call connection activation means 152 is an H.264 subordinate to the public wireless device 5. O. As the subsequent terminal, the “HO execution instruction” signal from the in-home device 3a is received, and the H.O. O. In order to cause the terminal 2a to switch the call path before the handover to the call path after the handover, O. A “switching call connection” signal is transmitted to the terminal 2a.
The second registration requesting means 156 is an H.264 subordinate to the home device 3a. O. As a rear terminal, the terminal is registered in the in-home device 3a. The second switching call connection activation means 157 is an H.264 subordinate to the in-home device 3a. O. As the rear terminal, O. In order to cause the terminal 2a to switch the call path before the handover to the call path after the handover, O. A “switching call connection” signal is transmitted to the terminal 2a.

FIG. 3 shows the H.D. O. The functional block diagram of the terminal 2a is shown.
H. O. The terminal 2a includes a control unit 210, a communication unit 220, and a call control unit 250a. The control unit 210 includes a CPU and various memories, and controls each unit, temporarily stores data, transfers data, and the like. The communication unit 220 transmits / receives data to / from the VoIP network N.

The call control unit 250a executes VoIP call control based on an instruction input by a user or a received call control signal. The call control unit 250 a includes a first switching unit 251, a first disconnection request unit 252, a second switching unit 256, and a second disconnection request unit 257.
The first switching means 251 is an H.264 subordinate to the public wireless device 5. O. Upon reception of the “switching call connection” signal from the subsequent terminal, the call path before the handover is switched to the communication path after the handover established by the “switching call connection” signal. The first disconnect request means 252 passes through the in-home device 3a to disconnect the H.D. O. A “disconnect request” signal is transmitted to the previous terminal.
The second switching means 256 is connected to the H.264 under the home device 3. O. Upon reception of the “switching call connection” signal transmitted from the back terminal via the home device 3a, the call path before the handover is switched to the communication path after the handover established by the “switching call connection” signal. The second disconnection request unit 257 is configured to connect the H.264 subordinate to the public wireless device 5 in order to disconnect the call path before the handover. O. A “disconnect request” signal is transmitted to the previous terminal.

FIG. 4 shows a functional block diagram of the in-home device 3a according to the present embodiment.
The in-home device 3a includes a control unit 310, a first communication unit 320, a second communication unit 330, and a call control unit 350a. The control unit 310 includes a CPU and various memories, and controls each unit, temporarily stores data, transfers data, and the like. The first communication means 320 is H.264. O. Wireless communication is performed with the terminal 1a. The second communication unit 330 transmits and receives data via the VoIP network N.

  The call control means 350a executes VoIP call control based on the received call control signal. O. An execution instruction transmission unit 351 is provided. H. O. The execution instruction transmitting means 351 receives the “HO notification” signal from the call control device 4a, and thereby the H.sub. O. An “HO execution instruction” signal is transmitted to the subsequent terminal. H. O. The execution instruction transmission unit 351 is a H.264 subordinate to itself. O. It is also possible to transmit an “HO execution instruction” signal to the previous terminal.

FIG. 5 is a functional block diagram of the call control device 4a according to the present embodiment.
The call control device 4a includes a control unit 410, a communication unit 420, an address conversion unit 440, and a call control unit 450a.
The control unit 410 includes a CPU and various memories, and controls each unit, temporarily stores data, transfers data, and the like. The communication unit 420 transmits and receives data via the VoIP network N. The address conversion means 440 is an O. Terminal 1, H. O. The destination SIP URL set in the call control signal or media signal transmitted by the terminal 2 or the home device 3 is converted into an IP address.
The call control means 450a executes VoIP call control based on the received call control signal. O. Notifying means 451 is provided. H. O. The notification means 451 is an H.264 device under the public wireless device 5. O. The reception of the “registration” signal from the later terminal detects that registration has been performed during the call, O. The terminal 1a notifies the in-home device 3a that the handover is requested by using a “HO notification” signal.

Next, the operation of the VoIP system according to the present embodiment will be described.
FIG. O. The operation | movement flow of the movement determination of the network in the terminal 1a is shown.
In FIG. O. The determination means 140 of the terminal 1a is the wireless device to which the terminal 1a belongs, that is, the radio wave intensity between the first communication means 120 and the in-home device 3a, and between the public wireless device 5 in the second communication means 130. Is monitoring the radio field intensity. H. O. When the terminal 1a moves during a call, for example, when the radio field intensity is below the radio field intensity (threshold) at which quality for a call cannot be ensured (step S11: YES), a search for a handover destination network is started. O. If the destination network exists (step S12: present), wireless connection to the network is performed.

  In the first communication means 120 or the second communication means 130, O. When the connection to the destination network is completed (step S13: OK), the O. The determination unit 140 of the terminal 1a (terminal after HO) determines whether the network is a network under the in-home device 3a or a network under the public wireless device 5. In the case of a wireless LAN, this can be determined by the received ESSID (network identifier).

  If the determination unit 140 determines that the connection destination is a network under the home device 3a (step S14: YES), the determination unit 140 performs registration in the home device 3a. If the registration is successful (step S15: OK), the determination unit 140 will be described later. Perform a handover operation. Further, when the determination unit 140 determines that the connection destination is the public wireless device 5 and is not a network under the home device 3a (step S14: NO), the determination unit 140 registers the location in the call control device 4a. If successful (step S16: OK), a handover operation described later is performed.

Next, the handover procedure will be described.
FIG. O. It is a figure which shows the hand-over procedure which the terminal 1a moved to subordinate to the public wireless apparatus 5 from the subordinate apparatus 3a under a telephone call. An underline in the operation flow indicates a new signal or a new parameter.

Before handover, H. O. Terminal 1a (HO previous terminal) and H. O. A home device 3a exists between the terminals 2a, and the home device 3a and the H.264 O. Between the previous terminal, the in-home device 3a and the H. O. The call path and the audio stream are terminated with the terminal 2a. H. O. The call path between the previous terminal and the home device 3a is called a call path A, H. O. A call path between the terminal 2a and the home device 3a is a call path B.
After the handover, H. O. The terminal 1a (HO post terminal) and the H. O. Both the call path and the audio stream are terminated with the terminal 2a. H. O. The rear terminal and the H. O. A call path with the terminal 2a is defined as a call path C.

  Step Sa21: The H.D. O. H. Talking with terminal 2a O. The terminal 1a moves under the public wireless device 5, and the determination means 140 O. When it is determined that the network to which the terminal 1a is connected is not a network under the home device 3a, the first registration request unit 151 transmits a “registration” signal to the call control device 4a. At this time, H.C. O. The terminal 1a (the post-HO terminal) has its own terminal information such as an IP address (address Z) and a dial-in number ("03-XXXX-1111 @ zzz") set as information in a normal "registration" signal. In addition to the above, notification is also made including information indicating that the call state is “busy”.

  Step Sa22: H. of the call control device 4a. O. The notification means 451 is an H.264 message. O. When a “registration” signal is received from a later terminal, it is determined that a request for handover is made because the call state includes information indicating “busy”, and the mobile terminal is moving between networks during the call. Then, a “HO notification” signal is sent to the in-home device 3a. This “HO notification” signal includes the H.O. O. Information for specifying the back terminal, for example, the SIP URI “03-XXXX-1111 @ zzz” is included. This is notified by specifying the destination by mapping the dial-in number “03-XXXX-1111” and the IP address “address Y” of the in-home device 3a.

  Step Sa23: H. of home device 3a. O. When the execution instruction transmitting means 351 receives the “HO notification” signal from the call control device 4a, the H.264 instruction is transmitted to prompt the execution of the handover. O. An “HO execution instruction” signal is transmitted to the subsequent terminal. At this time, as information necessary for setting the call path after the handover, the terminal (switching terminal) that performs switching of the call path before and after the handover is the “HO terminal 2a” and is switched (handover Notify that the previous call path (switching path) is “call path B”.

  Step Sa24: O. The execution instruction transmission unit 351 is an H.264 implementation. O. It is also possible to transmit an “HO execution instruction” signal to the previous terminal.

  Step Sa25: H.I. O. When the first switching call connection activation unit 152 of the rear terminal receives the “HO. Execution instruction” signal from the in-home device 3a, the first H.O. O. In order for the terminal 2a to switch the call path before the handover to the call path after the handover, O. A “switching call connection” signal is transmitted to the terminal 2a. At this time, it is notified that the call path (switching path) to be switched (before the handover) notified by the “HO execution instruction” signal is “call path B”. From this, O. The first switching means 251 of the terminal 2a switches the call path B before the handover to the call path C after the handover established by the “switching call connection” signal. Further, H.C. O. The audio stream from the later terminal is also H.264 O. Terminate directly with the terminal 2a.

  Steps Sa26 and Sa27: In order to disconnect the call path before the handover, O. The first disconnect request means 252 of the terminal 2a is connected to the H.264 via the in-home device 3a. O. A “disconnect request” signal is transmitted to the previous terminal, and call paths A and B are disconnected.

  FIG. 8 shows a sequence diagram when the handover procedure shown in FIG. 7 is realized by SIP. The parentheses after the step number indicate the corresponding step in FIG. An underline in the sequence diagram indicates a new signal or a new parameter.

  Steps Sa31 to Sa33: H.I. O. The terminal 1a (HO previous terminal) O. When an “INVITE” signal for starting a call is transmitted to the terminal 2a, the SIP URL “1111” of the caller is converted from the in-home device 3a to “03-XXXX-1111 @ yyy” and transmitted to the call control device 4a. . The call control device 4a receives the H.264 as a destination included in “INVITE”. O. From the SIP URL of the terminal 2a, O. The IP address of the terminal 2a is converted and O. An “INVITE” signal is transmitted to the terminal 2a. H. O. Upon receiving the “INVITE” signal, the terminal 2a returns a final response “200” signal indicating that the incoming call has been successful. The call control device 4a transmits a final response “200” signal to the in-home device 3a. O. A final response “200” signal is transmitted to the terminal 1a. Then, the H.O. O. The terminal 1a returns an “ACK” signal as an acknowledgment to the final response “200” signal to the in-home device 3a, the in-home device 3a transmits an “ACK” signal to the call control device 4a, and further, the call control device 4a H. O. An “ACK” signal is transmitted to the terminal 2a. As a result, H.C. O. The call path A between the terminal 1a and the home device 3a is the same as the home device 3a and the H. O. A call path B is established between the terminals 2a.

  Step Sa34: H.I. O. When the terminal 1a (the previous HO terminal) moves under the public radio apparatus 5, the terminal 1a detects the movement of the network.

  Step Sa35 (Step Sa21): H. O. The rear terminal transmits a “REGISTER” (registration) signal to the call control device 4a. The REGISTER signal includes a call state parameter in which “busy” is set.

  Step Sa36 (Step Sa22): Upon receiving the “REGISTER” signal, the call control device 4a notifies the in-home device 3a of a “NOTIFY” (HO notification) signal. This “NOTIFY” signal includes the H.264 signal. O. H. Information having set information for specifying the rear terminal. O. Contains notification parameters.

  Steps Sa37 and Sa38 (Step Sa23): Upon receiving the “NOTIFY” signal from the call control device 4a, the in-home device 3a receives the H.264 via the call control device 4a. O. A “REFER” (HO execution instruction) signal is transmitted to the subsequent terminal. In the “REFER” signal, a Refer-to parameter in which “fixed IP telephone” (URL of the HO terminal 2a, etc.) is set as a switching terminal, and “call path B” which is a switching path is set. Includes Replaces parameter.

  Step Sa39 (Step Sa24): The in-home device 3a O. A “REFER” signal in which the same parameters as in step Sa37 are set may be transmitted to the previous terminal.

  Steps Sa40 and Sa41 (Step Sa25): O. When the rear terminal receives the “REFER” signal from the in-home device 3a, the rear terminal receives the H.264 signal via the call control device 4a. O. An “INVITE” (switching call connection) signal is transmitted to the terminal 2a. The “INVITE” signal includes a Replaces parameter in which “call path B” is set as a call path (switching path) to be switched (before handover). H. O. The terminal 2a sends the final response “200” signal to the H.264 via the call control device 4a. O. When returned to the terminal, O. The rear terminal receives the “ACK” signal via the call control device 4a. O. Return to terminal 2a. As a result, the H.E. O. Terminal 2a and H.264. O. A call path C is established between the subsequent terminals.

  Steps Sa42 to Sa44 (Steps Sa26 and Sa27): O. The terminal 2a transmits a “BYE” (disconnect request) signal to the in-home device 3a via the call control device 4a, and the in-home device 3a transmits the “BYE” signal to the H.264 signal. O. Send to the previous terminal. H. O. The previous terminal transmits a final response “200” signal to the in-home device 3a to disconnect the call path A, and the in-home device 3a passes through the call control device 4a. O. A final response “200” signal is transmitted to the terminal 2a to disconnect the call path. In this way, the call path B before the handover is switched to the call path C after the handover established by the “INVITE” signal in steps Sa40 to Sa41.

FIG. O. It is a figure which shows the hand-over procedure when the terminal 1a moves to the subordinate apparatus 3a subordinate from the public radio | wireless apparatus 5 during a telephone call.
Before handover, H. O. The previous terminal and the H. O. Both the call path and the audio stream are terminated with the terminal 2a. H. O. The previous terminal and the H. O. A call path with the terminal 2a is referred to as a call path A.
After the handover, H. O. The rear terminal and the H. O. A home device 3a exists between the terminals 2a, and the home device 3a and the H.264 O. Between the terminal and the in-home device 3a and the H. O. The call path and the audio stream are terminated with the terminal 2a. H. O. The call path between the rear terminal and the home device 3a is called a call path B, H. O. A call path between the terminal 2a and the home device 3a is a call path C.

  Step Sa51: Under the public wireless device 5, the H. O. H. Talking with terminal 2a O. The terminal 1a moves, and the determination means 140 causes the H.264 to move. O. When it is determined that the network to which the terminal 1a is connected is the NW under the in-home device 3a, the second registration request unit 156 transmits a “registration” signal to the in-home device 3a. At this time, H.C. O. The terminal 1a (the post-HO terminal) includes its own terminal information such as an IP address ("address X") and a telephone number (extension number "1111") set as information in a normal "registration" signal. To notify.

  Step Sa52: H.I. O. The second switching call connection activation means 157 of the rear terminal determines that the handover needs to be performed and O. In order for the terminal 2a to switch the call path before the handover to the call path after the handover, O. A “switching call connection” signal is transmitted to the terminal 2a. At this time, it is also notified that the pre-handover call path (switching path) to be switched is “call path A”. Note that the “switching call connection” signal is an H.264 signal. O. The rear terminal and the H. O. Since it is transmitted via the in-home device 3a existing between the terminals 2a, O. A call path B is set between the rear terminal and the home device 3a. Further, H.C. O. The audio stream from the rear terminal is also terminated with the in-home device 3a, and the call path C is set.

  Step Sa53: H. O. In the second switching means 256 of the terminal 2a, in step Sa52 the H.264 via the home device 3a. O. When the “switching call connection” signal is received from the subsequent terminal, the call path A before the handover is switched to the call path C after the handover established by the “switching call connection” signal. Furthermore, H. O. The audio stream from the terminal 2a is also terminated with the in-home device 3a.

  Step Sa54: In order to disconnect the call path before the handover, O. The second disconnection requesting means 257 of the terminal 2a O. A “disconnect request” signal is transmitted to the previous terminal, and the call path A is disconnected.

  FIG. 10 shows a sequence diagram when the handover procedure shown in FIG. 9 is realized by SIP. The parentheses after the step number indicate the corresponding step in FIG.

  Steps Sa61 to Sa62: H.I. O. The terminal 1a (HO previous terminal) receives the H.0 via the call control device 4a. O. An “INVITE” signal for starting a call is transmitted to the terminal 2a. H. O. When the terminal 2a receives the “INVITE” signal, the terminal 2a sends a final response “200” signal indicating that the incoming call has been successful via the call control device 4a. O. Return to terminal 1a. H. O. The terminal 1a sends an “ACK” signal as an acknowledgment to the final response “200” signal via the call control device 4a. O. Return to terminal 2a. As a result, H.C. O. Terminal 1a (HO previous terminal) and H. O. A call path A is established between the terminals 2a.

  Step Sa63: H.I. O. The terminal 1a (the previous HO terminal) moves under the in-home device 3a. H. O. The terminal 1a detects network movement.

  Step Sa64 (Step Sa51): O. The rear terminal transmits a “REGISTER” (registration) signal to the in-home device 3a.

  Steps Sa65 to s67 (Steps Sa52 to Sa53): O. The subsequent terminal determines that the handover needs to be performed, and transmits an “INVITE” (switching call connection) signal to the in-home device 3a. The “INVITE” signal includes a Replaces parameter in which “call path A” is set as a call path (switching path) to be switched (before handover). The in-home device 3a sends the received “INVITE” signal to the H.264 via the call control device 4a. O. It transmits to the terminal 2a. H. O. The terminal 2a returns a final response “200” signal to the in-home device 3a via the call control device 4a, and the in-home device 3a sends the received final response “200” signal to the H.264 signal. O. Send to a later terminal. H. O. The rear terminal is. An “ACK” signal as an acknowledgment to the final response “200” signal is returned to the call control device 4a via the in-home device 3a, and the call control device 4a sends the received “ACK” signal to the H. O. It transmits to the terminal 2a. As a result, H.C. O. The call path B is between the rear terminal and the home device 3a. O. Terminal 2a and H.264. O. A call path C is established between the subsequent terminals.

  Step Sa68 (Step Sa54): O. Upon receiving the “INVITE” signal, the terminal 2a switches the call path A before the handover to the call path C after the handover established by the “INVITE” signal. O. The audio stream from the terminal 2a is also terminated with the in-home device 3a. H. O. The terminal 2a O. A “BYE” (disconnect request) signal is sent to the previous terminal via the call control device 4a. O. Sent to the previous terminal. O. The previous terminal returns a final response “200” signal via the call control device 4 a and disconnects the call path A.

<Second Embodiment>
In the second embodiment, H.264. O. When the terminal 1 moves during a call, O. Terminal 2 is H.264. O. Direct the implementation. H. of FIG. 1 in the second embodiment. O. Terminal 1, H. O. The terminal 2, the in-home device 3, and the call control device 4 are respectively connected to the H.264. O. Terminal 1b, H. O. The terminal 2b, the in-home device 3b, and the call control device 4b are assumed. In this embodiment, the H.264 before the handover is performed. O. Terminal 1b is connected to H.264. O. Previous terminal, H. O. Terminal 1b is connected to H.264. O. It is described as a back terminal.
In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

FIG. 11 shows the H.264 according to this embodiment. O. The functional block diagram of the terminal 1b is shown.
In FIG. O. The terminal 1b includes a control unit 110, a first communication unit 120, a second communication unit 130, a determination unit 140, and a call control unit 150b. The control unit 110, the first communication unit 120, the second communication unit 130, and the determination unit 140 are the same as those in the first embodiment.

  The call control unit 150b executes VoIP call control based on an instruction input by a user or a received call control signal. The call control unit 150b includes a first registration request unit 161, a first path switching unit 162, a first disconnection request unit 163, a second registration request unit 166, a second path switching unit 167, and a second Disconnection request means 168.

  The first registration request means 161 is an H.264 subordinate to the public wireless device 5. O. As a subsequent terminal, the terminal is registered in the call control device 4b. The first path switching means 162 is an H.264 subordinate to the public wireless device 5. O. As the rear terminal, O. The “switching call connection” signal from the terminal 2b is received, and the call path before handover is switched to the call path after handover established by the “switching call connection” signal. The first disconnection requesting unit 163 is configured to disconnect the H.D. O. As the previous terminal, the H.D. O. A “disconnect request” signal is transmitted to the terminal 2b.

  The second registration request means 166 is an H.264 subordinate to the in-home device 3b. O. As a subsequent terminal, the terminal is registered in the in-home device 3b. The second path switching means 167 receives the “switching call connection” signal transmitted via the home device 3b at the time of handover to the home device 3b, Switch to the post-handover call path established by the signal. The second disconnection request means 168 is configured to connect the H.264 subordinate to the public wireless device 5 in order to disconnect the call path before the handover at the time of handover to the home device 3b. O. As the previous terminal, O. A “disconnect request” signal is transmitted to the terminal 2b.

FIG. 12 shows the H.D. O. The functional block diagram of the terminal 2b is shown.
H. O. The terminal 2b includes a control unit 210, a communication unit 220, and a call control unit 250b. The control unit 210 and the communication unit 220 are the same as those in the first embodiment. The call control unit 250b executes VoIP call control, and includes a first switching call connection activation unit 261 and a second switching call connection activation unit 266.
The first switching call connection activation means 261 receives the H.O. execution instruction signal from the in-home device 3b, and thereby the H.sub. O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal. The second switching call connection activation means 266 receives the “HO execution instruction” signal from the in-home device 3b, and receives the H.O. O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal.

FIG. 13 is a functional block diagram of the in-home device 3b according to the present embodiment.
The in-home device 3b includes a control unit 310, a first communication unit 320, a second communication unit 330, and a call control unit 350b. The control unit 310, the first communication unit 320, and the second communication unit 330 are the same as those in the first embodiment. The call control means 350b executes VoIP call control based on the received call control signal, and performs the first H.264 call control. O. Execution instruction means 361 and second H.264. O. An execution instruction unit 366 is provided.

  First H.P. O. The execution instructing unit 361 receives the “HO notification” signal from the call control device 4b to receive the H.O. O. An “HO execution instruction” signal is transmitted to the terminal 2b. Second H.P. O. The execution instructing means 366 includes the H.I. O. The reception of the “registration” signal from the subsequent terminal detects that the registration has been performed during the call and prompts the user to execute the handover. O. An “HO execution instruction” signal is transmitted to the terminal 2b.

FIG. 14 is a functional block diagram of the call control device 4b according to the present embodiment.
The call control device 4b includes a control unit 410, a communication unit 420, an address conversion unit 440, and a call control unit 450b. The control unit 410, the communication unit 420, and the address conversion unit 440 are the same as those in the first embodiment. The call control means 450b executes VoIP call control based on the received call control signal. O. Notification means 461 is provided.
H. O. The notification means 461 is an H.264 service under the public wireless device 5. O. The reception of the “registration” signal from the later terminal detects that registration has been performed during a call, O. It notifies the in-home device 3b that the terminal is requesting the execution of the handover using a “HO notification” signal.

Next, the operation of the VoIP system according to the present embodiment will be described.
H. O. Since the operation flow of the network movement determination in the terminal 1b is the same as that in FIG. 6 of the first embodiment, the handover procedure will be described below.
FIG. O. It is a figure which shows the hand-over procedure which the terminal 1b moved from the subordinate apparatus 3b subordinate to the public radio | wireless apparatus 5 during a telephone call.
Before handover, H. O. Terminal 1b (HO previous terminal) and H. O. A home device 3b exists between the terminals 2b, and the home device 3b and the H.264 O. Between the previous terminal, the in-home device 3b, and the H. O. The call path and the audio stream are terminated with the terminal 2b. H. O. A call path between the previous terminal and the home device 3b is called a call path A, H. O. A call path between the terminal 2b and the home device 3b is a call path B.
After the handover, H. O. Terminal 1b (HO post terminal) and H. O. Both the call path and the audio stream are terminated with the terminal 2b. H. O. The rear terminal and the H. O. A call path with the terminal 2b is a call path C.

  Step Sb21: The H.C. O. H. Talking with terminal 2b O. The terminal 1b moves under the public wireless device 5, and the determination means 140 O. If it is determined that the network to which the terminal 1b is connected is not a network under the home device 3b, the first registration requesting means 161 transmits a “registration” signal to the call control device 4b. At this time, in addition to its own terminal information (IP address and dial-in number) as information in the normal “registration” signal, the call state “busy”, H. O. Information for specifying the terminal 2b, for example, H. O. The SIP URI of the terminal 2b is also notified.

  Step Sb22: H. of the call control device 4b. O. The notification means 461 is an H.264 notification. O. When a “registration” signal is received from a later terminal, it is determined that a handover is requested because the call state includes information indicating that the call is “busy” and is moving between networks during a call. . H. O. The notification means 461 is an H.264 notification. O. The terminal 1b notifies the in-home device 3b that the handover is requested by using a “HO notification” signal. This is notified by mapping the dial-in number and the IP address of the home device 3b. At this time, the H.E. O. In order to make it possible to specify the terminal 2b, O. Information (SIP URI etc.) for specifying the terminal 2b is notified.

  Step Sb23: The first H.D. O. When receiving the “HO notification” signal from the call control device 4b, the execution instruction unit 361 receives the H.O. O. An “HO execution instruction” signal is transmitted to the terminal 2b. At this time, as information necessary for setting the call path after the handover, the terminal (switching terminal) that switches the call path before and after the handover is the “HO. ) Is notified that the call path (switching path) is “call path A”.

  Step Sb24: H. O. When the first switching call connection activation means 261 of the terminal 2b receives the “HO. Execution instruction” signal from the in-home device 3b, the H.H. O. In the subsequent terminal, in order to switch the call path before the handover to the call path after the handover, O. A “switching call connection” signal is transmitted to the subsequent terminal. At this time, it is notified that the call path (switching path) to be switched (before the handover) notified by the “HO execution instruction” signal is “call path A”. H. O. The first path switching means 162 of the rear terminal receives the H. O. When the “switching call connection” signal from the terminal 2b is received, the call path A before the handover is switched to the call path C after the handover established by the “switching call connection” signal. Further, H.C. O. The audio stream from the later terminal is also H.264 O. Terminate directly with the terminal 2b.

  Steps Sb25 and Sb26: H.264. O. The first disconnect request unit 163 of the previous terminal receives the H.264 signal via the home device 3b in order to disconnect the call path before the handover. O. A “disconnect request” signal is transmitted to the terminal 2b, and the call path A and the call path B are disconnected.

  FIG. 16 shows a sequence diagram when the handover procedure shown in FIG. 15 is realized by SIP. The parentheses after the step number indicate the corresponding step in FIG.

  Steps Sb31 to Sb34: The same processing as Steps Sa31 to Sa34 in FIG. 10 in the first embodiment is performed. That is, H.I. O. A call path A is established between the terminal 1b and the home device 3b. O. After establishing the call path B between the terminals 2b, O. When the terminal 1b moves under the public wireless device 5, the movement of the network is detected.

  Step Sb35 (Step Sb21): O. The rear terminal (HO terminal 1b) transmits a “REGISTER” (registration) signal to the call control device 4b. The “REGISTER” signal includes a call state parameter set to “busy”, an H. O. Specific information (SIP URI) of the terminal 2b is included.

  Step Sb36 (Step Sb22): When the call control device 4b receives the “REGISTER” signal, the call control device 4b determines that the handover is requested because the call state parameter is “busy”, and sends “NOTIFY” to the in-home device 3b. (HO notification) signal is transmitted. The “NOTIFY” signal includes the H. O. H. for which information (SIP URI etc.) for specifying the terminal 2b is set. O. Contains notification parameters.

  Steps Sb37, b38 (Step Sb23): Upon receiving the “NOTIFY” signal from the call control device 4b, the in-home device 3b receives the H. O. A “REFER” (HO execution instruction) signal is transmitted to the terminal 2b. The “REFER” signal includes a Refer-to parameter in which “HO. Post-terminal” (such as SIP URL) is set as a switching terminal and a Replaces parameter in which “switching path A” is set as a switching path. It is.

  Steps Sb39 and Sb40 (Step Sb24): O. When the terminal 2b receives the “REFER” signal, the terminal 2b receives the H.264 signal via the call control device 4b. O. An “INVITE” (switching call connection) signal is transmitted to the subsequent terminal. The “INVITE” signal includes a Replaces parameter in which “call path A” is set as a call path (switching path) to be switched (before handover). H. O. The rear terminal sends the final response “200” signal to the H.264 via the call control device 4b. O. Returned to the terminal 2b, the H. O. The terminal 2b is connected to the H.264 via the call control device 4b. O. An “ACK” signal is transmitted to the subsequent terminal. As a result, the H.E. O. Terminal 2b and H.264. O. A call path C is established between the subsequent terminals.

  Steps Sb41 to Sb43 (Steps Sb25 and Sb26): O. The previous terminal transmits a “BYE” (disconnect request) signal to the in-home device 3b, and the in-home device 3b returns a final response “200” signal to disconnect the call path A. Further, the in-home device 3b is connected to the H.264 via the call control device 4b. O. A “BYE” signal is transmitted to the terminal 2b. H. O. The terminal 2b returns a final response “200” signal and disconnects the call path B.

FIG. O. It is a figure which shows the hand-over procedure when the terminal 1b moves from the public radio | wireless apparatus 5 subordinate to the subscriber | terminal apparatus 3b under a telephone call.
Before handover, H. O. The previous terminal and the H. O. Both the call path and the audio stream are terminated between the terminals 2b. H. O. The previous terminal and the H. O. A call path with the terminal 2b is referred to as a call path A.
After the handover, H. O. The rear terminal and the H. O. A home device 3b exists between the terminals 2b, and the home device 3b and the H.264 O. Between the back terminal and the in-home device 3b and the H. O. The call path and the audio stream are terminated with the terminal 2b. H. O. The call path between the rear terminal and the home device 3b is called a call path B, H. O. A call path between the terminal 2b and the home device 3b is a call path C.

  Step Sb51: The H.sub. O. H. Talking with terminal 2b O. The terminal 1b moves, and the determination means 140 causes the H.264 to move. O. When it is determined that the network to which the terminal 1b is connected is a network under the in-home device 3b, the second registration request unit 166 transmits a “registration” signal to the in-home device 3b. At this time, in addition to the own terminal information (IP address and dial-in number) as information in the normal “registration” signal, the call state is “busy”, and the call path (before handover) to be switched (before handover) (Switching path) is “call path A” (optional), and O. Notification is also made including information (SIP URI, etc.) for specifying the terminal 2b.

  Step Sb52: The second H.P. O. The execution instruction means 366 is an H.264 implementation. O. When the “registration” signal is received from the back terminal, the information indicating that the call state is “busy” is included. In order to promote the handover, O. An “HO execution instruction” signal is transmitted to the terminal 2b. At this time, as information necessary for setting the call path after the handover, the terminal (switching terminal) that switches the call path before and after the handover is the “HO. ) Is notified that the call path (switching path) is “call path A”.

  Step Sb53: H. O. When the second switching call connection activation means 266 of the terminal 2b receives the “HO. O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal. At this time, it may be notified that the call path (switching path) to be switched (before the handover) is “call path A”. Note that the “switching call connection” signal is an H.264 signal. O. The rear terminal and the H. O. Since it is transmitted via the in-home device 3b existing between the terminal 2b and the terminal 2b, O. A call path C is set between the terminal 2b and the in-home device 3b. Furthermore, H. O. The audio stream from the terminal 2b is also terminated with the in-home device 3b.

  Step Sb54: The call control means 350b of the home device 3b O. The “switching call connection” signal received from the terminal 2b is sent to the H.264 terminal. O. Send to a later terminal. H. O. In step Sb53, the second path switching means 167 of the rear terminal receives the H.D. O. The “switching call connection” signal transmitted from the terminal 2b is received, and the call path A before handover is switched to the call path B after handover established by the “switching call connection” signal. Further, H.C. O. The audio stream from the rear terminal is also terminated with the in-home device 3b.

  Step Sb55: H. O. The second disconnection requesting means 168 of the previous terminal uses H.264 to disconnect the call path before the handover. O. A “disconnect request” signal is transmitted to the terminal 1b to disconnect the call path A.

  FIG. 18 shows a sequence diagram when the handover procedure shown in FIG. 17 is realized by SIP. The parentheses after the step number indicate the corresponding step in FIG.

  Steps Sb61 to Sb63: The same processing as Steps Sa61 to Sa63 of FIG. 13 in the first embodiment is performed. That is, H.sub. O. The terminal 1b and the H. O. After establishing the call path A between the terminals 2b, O. The terminal 1b moves under the home device 3b. H. O. The terminal 1b detects network movement.

  Step Sb64 (Step Sb51): O. The rear terminal (HO terminal 1b) transmits a “REGISTER” (registration) signal to the in-home device 3b. The “REGISTER” signal includes a call state parameter in which “busy” is set, a switching path parameter in which “call path A” is set, O. Information for specifying the terminal 2b is included.

  Steps Sb65 and Sb66 (Step Sb52): Upon receipt of the “REGISTER” signal, the in-home device 3b determines that the handover is requested because the call state parameter is “busy”, and passes through the call control device 4b. H. O. A “REFER” (HO execution instruction) signal is transmitted to the terminal 2b. The “REFER” signal includes a Refer-to parameter in which “HO. Post-terminal” (such as SIP URL) is set as a switching terminal and a Replaces parameter in which “switching path A” is set as a switching path. It is.

  Steps Sb67 and Sb68 (Step Sb53): O. When the terminal 2b receives the “REFER” signal from the in-home device 3b, the terminal 2b O. An “INVITE” (switching call connection) signal is transmitted to the subsequent terminal. The “INVITE” signal includes a Replaces parameter in which “call path A” is set as a call path (switching path) to be switched (before handover). H. O. The rear terminal sends the final response “200” signal to the H.264 via the in-home device 3b and the call control device 4b. O. Returned to the terminal 2b, the H. O. The terminal 2b sends an “ACK” signal as an acknowledgment to the final response “200” signal via the call control device 4b and the home device 3b. O. Send to a later terminal. As a result, the H.E. O. A call path C is established between the terminal 2b and the in-home device 3b.

  Step Sb69 (Step Sb54): The in-home device 3b O. The “INVITE” signal received from the terminal 2b is transmitted to the H.264 standard. O. Send to a later terminal. H. O. The rear terminal switches the call path A indicated by the Replaces parameter in the “INVITE” signal to the call path B established after the handover.

  Steps Sb70 and Sb71 (Step Sb55): O. The previous terminal receives the “BYE” (disconnect request) signal via the call control device 4b. O. Transmitted to the terminal 2b, O. The terminal 2b returns a final response “200” signal and disconnects the call path A. Further, the in-home device 3b is connected to the H.264 via the call control device 4b. O. A “BYE” signal is transmitted to the terminal 2b. H. O. The terminal 2b returns a final response “200” signal and disconnects the call path B.

<Third Embodiment>
In the third embodiment, H.264. O. When the terminal 1 moves during a call, the in-home device 3 becomes H.264. O. Direct implementation. H. of FIG. 1 in the third embodiment. O. Terminal 1, H. O. The terminal 2, the in-home device 3, and the call control device 4 are respectively connected to the H.264. O. Terminal 1c, H. O. A terminal 2c, a home device 3c, and a call control device 4c are assumed. In this embodiment, the H.264 before the handover is performed. O. Terminal 1c is connected to H.264. O. Previous terminal, H. O. Terminal 1c is connected to H.264. O. It is described as a back terminal.
In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

FIG. 19 shows an H.264 format according to this embodiment. O. The functional block diagram of the terminal 1c is shown.
In FIG. O. The terminal 1c includes a control unit 110, a first communication unit 120, a second communication unit 130, a determination unit 140, and a call control unit 150c. The control unit 110, the first communication unit 120, the second communication unit 130, and the determination unit 140 are the same as those in the first embodiment.

The call control unit 150c executes VoIP call control based on an instruction input by the user or a received call control signal, and performs first registration request unit 171, first path switching unit 172, first disconnection. A request unit 173, a second registration request unit 176, and a second path switching unit 177.
The first registration request means 171 is an H.264 subordinate to the public wireless device 5. O. As a subsequent terminal, the terminal is registered in the call control device 4c. The first path switching means 172 is an H.264 subordinate to the public wireless device 5. O. As a subsequent terminal, it receives the “switching call connection” signal from the in-home device 3c, and switches the call path before handover to the call path after handover established by the “switching call connection” signal. The first disconnection request unit 173 disconnects the H.264 subordinate to the in-home device 3c in order to disconnect the call path before the handover. O. As the previous terminal, a “disconnect request” signal is transmitted to the in-home device 3c.

  The second registration request means 176 is an H.264 device under the home device 3c. O. As a rear terminal, the terminal is registered in the in-home device 3c. The second path switching means 177 establishes the call path before the handover by the “switching call connection” signal by receiving the “switching call connection” signal from the household device 3c at the time of the handover to the subordinate of the household device 3c. Switch to the post-handover call path.

FIG. 20 shows an H.D. O. The functional block diagram of the terminal 2c is shown.
H. O. The terminal 2c includes a control unit 210, a communication unit 220, and a call control unit 250c. The control unit 210 and the communication unit 220 are the same as those in the first embodiment. The call control unit 250 c executes VoIP call control, and includes a path switching unit 276 and a disconnection request unit 277.
The path switching unit 276 switches the call path before the handover to the call path after the handover established by the “switching call connection” signal by receiving the “switching call connection” signal from the in-home device 3c. The disconnection requesting unit 277 is configured to connect the H.264 subordinate to the public wireless device 5 in order to disconnect the call path before the handover. O. A “disconnect request” signal is transmitted to the previous terminal.

FIG. 21 shows a functional block diagram of the in-home device 3c according to the present embodiment.
The in-home device 3c includes a control unit 310, a first communication unit 320, a second communication unit 330, and a call control unit 350c. The control unit 310, the first communication unit 320, and the second communication unit 330 are the same as those in the first embodiment. The call control unit 350c executes VoIP call control based on the received call control signal, and performs the first switching call connection activation unit 371, the second switching call connection activation unit 376, and the third switching call. Connection activation means 377 is provided.

The first switching call connection activation means 371 receives the “HO execution instruction” signal from the call control device 4c, and receives the H.O. O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal.
The second switching call connection activation means 376 is an H.264 subordinate to itself. O. The reception of the “registration” signal from the later terminal detects that registration has been performed during a call, O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal.
The third switching call connection activation means 377 is the H.sub. O. The reception of the “registration” signal from the later terminal detects that registration has been performed during the call, O. In order for the terminal 2c to switch the call path before the handover to the call path after the handover, O. A “switching call connection” signal is transmitted to the terminal 2c.

FIG. 22 is a functional block diagram of the call control device 4c according to the present embodiment.
The call control device 4c includes a control unit 410, a communication unit 420, an address conversion unit 440, and a call control unit 450c. The control unit 410, the communication unit 420, and the address conversion unit 440 are the same as those in the first embodiment. The call control unit 450c executes VoIP call control based on the received call control signal. O. Implementation instruction means 471 is provided.
H. O. The execution instructing unit 471 is an H.264 subordinate to the public wireless device 5a. O. Upon reception of the “registration” signal from the subsequent terminal, it is detected that registration has been performed during a call, and an “HO.execution instruction” signal is transmitted to the in-home device 3c in order to prompt the implementation of the handover.

Next, the operation of the VoIP system according to the present embodiment will be described.
H. O. Since the operation flow for determining network movement in the terminal 1c is the same as that in FIG. 6 of the first embodiment, the handover procedure will be described below.

FIG. O. It is a figure which shows the hand-over procedure which the terminal 1c moved from the subordinate apparatus 3c subordinate to the public radio | wireless apparatus 5 during a telephone call.
Before handover, H. O. Terminal 1c (HO previous terminal) and H. O. A home device 3c exists between the terminals 2c, and the home device 3c and the H.264 O. Between the previous terminal and the in-home device 3c and the H. O. The call path and the audio stream are terminated with the terminal 2c. H. O. The call path between the previous terminal and the in-home device 3c is the call path A, H. O. A call path between the terminal 2c and the in-home device 3c is a call path B.
After the handover, H. O. Terminal 1c (HO post terminal) and H. O. The in-home device 3c terminates the call path with the terminal 2c. The audio stream is H.264. O. The rear terminal and the H. O. It terminates with the terminal 2c. In-home device 3c and H. O. A call path with the terminal 2c is referred to as a call path C.

  Step Sc21: The H.C. O. H. Talking with terminal 2c O. The terminal 1c moves under the public wireless device 5, and the determination means 140 O. When it is determined that the network to which the terminal 1c is connected is not a network under the home device 3c, the first registration request unit 171 transmits a “registration” signal to the call control device 4c. At this time, in addition to its own terminal information (IP address and dial-in number) as information in the normal “registration” signal, the call state “busy”, H. O. Information for specifying the terminal 2c, for example, H. O. The SIP URI of the terminal 2c is also notified.

  Step Sc22: H. of the call control device 4c. O. The execution instruction means 471 is an H.264 implementation. O. When a “registration” signal is received from the back terminal, it is determined that the call state is “calling”, so that it is moving between networks during a call and a handover is requested. In order to prompt the execution of the handover, a “HO execution instruction” signal is transmitted to the in-home device 3c (notified by mapping the dial-in number and the IP address of the in-home device). At this time, as information necessary for setting the call path after the handover, the terminal (switching terminal) that switches the call path before and after the handover is the “HO. ) Is notified that the call path (switching path) is “call path A” (optional).

Step Sc23: Upon receiving the “HO execution instruction” signal, the first switching call connection activation means 371 of the in-home device 3c receives the H.O. O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal. At this time, it may be notified that the call path (switching path) to be switched (before the handover) notified by the “HO execution instruction” signal is “call path A”. From this, H.H. O. The subsequent terminal switches the call path A before the handover to the call path C after the handover established by the “switching call connection” signal. Further, H.C. O. The audio stream from the subsequent terminal is H.264. O. It changes so that it may transmit directly to the terminal 2c.

Step Sc24: In order to disconnect the call path before the handover, O. The first disconnect request unit 173 of the previous terminal disconnects the call path A by transmitting a “disconnect request” signal to the in-home device 3c.

  FIG. 24 shows a sequence diagram when the handover procedure shown in FIG. 23 is realized by SIP. The parentheses after the step number indicate the corresponding step in FIG.

  Steps Sc31 to Sc34: The same processes as steps Sa31 to Sa34 in FIG. 10 in the first embodiment are performed. That is, H.I. O. The call path A between the terminal 1c and the home device 3c is changed to the home device 3c and the H. O. After establishing the call path B between the terminals 2c, O. When the terminal 1c moves under the public wireless device 5, the movement of the network is detected.

  Step Sc35 (Step Sc21): O. The rear terminal (HO terminal 1c) transmits a “REGISTER” (registration) signal to the call control device 4c. The “REGISTER” signal includes a call state parameter in which “busy” is set and a switching path parameter in which “call path A” is set.

  Step Sc36 (Step Sc22): Upon receipt of the “REGISTER” signal, the call control device 4c determines that the handover is requested because the call state parameter is “busy”, and “REFER” is sent to the in-home device 3c. (HO execution instruction) signal is transmitted. The “REFER” signal includes a Refer-to parameter in which “HO post terminal” (SIP URL or the like) is set, and a Replaces parameter in which “call path A” is set.

  Steps Sc37 and Sc38 (Step Sc23): The in-home device 3c sends an “INVITE” (switching call connection) signal to the H.264 via the call control device 4c. O. Send to a later terminal. The “INVITE” signal includes a Replaces parameter in which “call path A” read from the “REFER” signal is set. H. O. The rear terminal returns the final response “200” signal to the in-home device 3c via the call control device 4c, and the in-home device 3c uses the “ACK” signal as the confirmation response to the final response “200” signal to perform call control. Via the device 4c. O. Send it back to the terminal. As a result, H.C. O. A call path C is set between the rear terminal and the in-home device 3c. H. O. The rear terminal switches the call path A to the call path C. O. The audio stream from the subsequent terminal is H.264. O. It changes so that it may transmit directly to the terminal 2c.

  Step Sc39 (Step Sc24): O. The previous terminal transmits a “BYE” (disconnect request) signal to the in-home device 3c, and the in-home device 3c returns a final response “200” signal to disconnect the call path A.

FIG. O. It is a figure which shows the hand-over procedure when the terminal 1c moves to the subordinate apparatus 3c subordinate from the public radio | wireless apparatus 5 during a telephone call.
Before handover, H. O. The previous terminal and the H. O. Both the call path and the audio stream are terminated between the terminals 2c. H. O. The previous terminal and the H. O. A call path with the terminal 2c is referred to as a call path A.
After the handover, H. O. The rear terminal and the H. O. A home device 3c exists between the terminals 2c, and the home device 3c and the H.264 O. Between the terminal and the in-home device 3c and the H. O. The call path and the audio stream are terminated with the terminal 2c. H. O. The call path between the rear terminal and the in-home device 3c is the call path B, the H. O. A call path between the terminal 2c and the home device 3c is a call path C.

  Step Sc51: The H. O. H. Talking with terminal 2c O. The terminal 1c (the previous HO terminal) moves, and the determination unit 140 causes the H.O. O. When it is determined that the network to which the terminal 1c (the post-HO terminal) is connected is an NW under the home device 3c, the H.O. O. The second registration request means 176 of the rear terminal transmits a “registration” signal to the in-home device 3c. At this time, in addition to its own terminal information (IP address and dial-in number) as information in the normal “registration” signal, the call state is “busy”, and the call path (switching before handover) (switching) Path) is “call path A” (optional), H. O. Notification is also made including information (SIP URI etc.) for specifying the terminal 2c.

  Step Sc52: The second switching call connection activation means 376 of the home device 3c O. When the “registration” signal is received from the back terminal, the information indicating that the call state is “busy” is included, and it is determined that a handover is requested because the mobile device moves between networks during the call. H. O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal. At this time, it may be notified that the call path (switching path) to be switched (before the handover) is “call path A”. H. O. The second path switching means 177 of the subsequent terminal switches the call path A before the handover to the call path B after the handover established by the “switching call connection” signal. Further, H.C. O. The audio stream from the rear terminal is also terminated with the in-home device 3c.

  Step Sc53: The third switching call connection activation means 377 of the in-home device 3c performs the same as in step Sc52. O. In order for the terminal 2c to switch the call path before the handover to the call path after the handover, O. To terminal 2c. A “switching call connection” signal is transmitted to O. At this time, it may be notified that the call path (switching path) to be switched (before the handover) is “call path A”. From this, O. The terminal 2c switches the call path A before the handover to the call path C after the handover set in the “switching call connection” signal. Furthermore, H. O. The audio stream from the terminal 2c is also terminated with the in-home device 3c.

  Step Sc54: In order to disconnect the call path before the handover, O. The disconnection requesting means 277 of the terminal 2 c O. A “disconnect request” signal is transmitted to the previous terminal, and the call path A is disconnected.

  FIG. 26 shows a sequence diagram when the handover procedure shown in FIG. 25 is realized by SIP. The parentheses after the step number indicate the corresponding step in FIG.

  Steps Sc61 to Sc63: The same processing as in steps Sa61 to Sa63 of FIG. 13 in the first embodiment is performed. That is, H.sub. O. Terminal 1c and H. O. After establishing the call path A between the terminals 2c, O. The terminal 1c moves under the home device 3c. H. O. The terminal 1c detects network movement.

  Step Sc64 (Step Sc51): O. The rear terminal (HO terminal 1c) transmits a “REGISTER” (registration) signal to the in-home device 3c. The “REGISTER” signal includes a call state parameter set to “busy”, a switching path parameter set to “call path A”, O. Information for specifying the terminal 2c is included.

  Step Sc65 (Step Sc52): The home device 3c O. When the “REGISTER” signal is received from the subsequent terminal, it is determined that the handover is requested because the call state parameter is “busy”. O. An “INVITE” (switching call connection) signal is transmitted to the subsequent terminal. The “INVITE” signal includes a Replaces parameter in which “call path A” is set. The in-home device 3c returns a final response “200” signal. O. The rear terminal transmits an “ACK” signal as an acknowledgment to the final response “200” signal to the in-home device 3c. As a result, H.C. O. A call path B is established between the rear terminal and the home device 3c.

  Steps Sc66 and Sc67 (Step Sc53): The in-home device 3c further receives the H. O. An “INVITE” (switching call connection) signal is transmitted to the terminal 2c. At this time, the Replaces parameter in which “call path A” is set as the call path (switching path) to be switched (before handover) is included. H. O. The terminal 2c returns a final response “200” signal via the call control device 4c, and the in-home device 3c sends an “ACK” signal as an acknowledgment to the final response “200” signal via the call control device 4c. H. O. It transmits to the terminal 2c. Thereby, the in-home device 3c and the H. O. A call path C is established between the terminals 2c. H. O. The terminal 2c switches the call path A before the handover to the call path C set in the “INVITE” signal. Furthermore, H. O. The audio stream from the terminal 2c is also terminated with the in-home device 3c.

  Step Sc68 (Step Sc54): O. The terminal 2c is connected to the H.264 via the call control device 4c. O. A “BYE” (disconnect request) signal is transmitted to the previous terminal. O. The previous terminal returns a final response “200” signal via the call control device 4c. As a result, the call path A is disconnected.

<Fourth Embodiment>
In the fourth embodiment, the H.264 standard. O. When the terminal 1 moves during a call, the call control device 4 becomes H.264. O. Direct the implementation. H. of FIG. 1 in the fourth embodiment. O. Terminal 1, H. O. The terminal 2, the in-home device 3, and the call control device 4 are respectively connected to the H.264. O. Terminal 1d, H. O. The terminal 2d, the in-home device 3d, and the call control device 4d are assumed. In this embodiment, the H.264 before the handover is performed. O. Terminal 1d is connected to H.264. O. Previous terminal, H. O. Terminal 1d is connected to H.264. O. It is described as a back terminal.
In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

FIG. 27 shows the H.264 according to this embodiment. O. The functional block diagram of the terminal 1d is shown.
In FIG. O. The terminal 1d includes a control unit 110, a first communication unit 120, a second communication unit 130, a determination unit 140, and a call control unit 150d. The control unit 110, the first communication unit 120, the second communication unit 130, and the determination unit 140 are the same as those in the first embodiment. The call control unit 150d executes VoIP call control based on an instruction input by the user or a received call control signal, and performs first registration request unit 181, first path switching unit 182, first disconnection. A request unit 183, a second registration request unit 186, a second path switching unit 187, and a second disconnection request unit 188.

The first registration request means 181 is an H.264 subordinate to the public wireless device 5. O. The terminal is registered to the call control device 4d from the subsequent terminal. The first path switching means 182 is an H.264 subordinate to the public wireless device 5. O. As a subsequent terminal, upon reception of the “switching call connection” signal from the call control device 4d, the communication path before the handover is switched to the communication path after the handover established by the “switching call connection” signal. The first disconnection request unit 183 is configured to disconnect the H.264 subordinate to the in-home device 3d in order to disconnect the call path before the handover. O. As a previous terminal, a “disconnect request” signal is transmitted to the call control device 4d via the in-home device 3d.
The second registration request means 186 is an H.264 subordinate to the home device 3d. O. As a subsequent terminal, the terminal is registered in the in-home device 3d. The second path switching means 187 establishes the call path before the handover by the “switching call connection” signal based on the “switching call connection” signal transmitted from the household device 3d during the handover to the subordinate of the household device 3d. Switch to the post-handover call path. The second disconnection requesting unit 188 is configured to disconnect the H.D. subordinate to the in-home device 3d in order to disconnect the call path before the handover. O. As the previous terminal, a “disconnect request” signal is transmitted to the call control device 4d.

FIG. 28 is a diagram illustrating an H.D. O. The functional block diagram of the terminal 2d is shown.
H. O. The terminal 2d includes a control unit 210, a communication unit 220, and a call control unit 250d. The control unit 210 and the communication unit 220 are the same as those in the first embodiment. The call control unit 250d executes VoIP call control, and includes a first session change unit 281 and a second session change unit 282.
The first session changing means 281 receives the “session change” signal from the call control device 4d, and receives the “H. O. The audio stream from the terminal 2d is sent to the H.264 subordinate to the public wireless device 5. O. Send to a later terminal. The second session change means 282 receives the “session change” signal from the call control device 4d, and receives the “H. O. The audio stream from the terminal 2d is H.264. O. It is transmitted to the in-home device 3d that is the handover destination of the subsequent terminal.

FIG. 29 shows a functional block diagram of the in-home device 3d according to the present embodiment.
The in-home device 3d includes a control unit 310, a first communication unit 320, a second communication unit 330, and a call control unit 350d. The control unit 310, the first communication unit 320, and the second communication unit 330 are the same as those in the first embodiment. The call control unit 350d executes VoIP call control based on the received call control signal. O. An execution instruction unit 381 is provided.
H. O. The execution instructing means 381 is an H.264 subordinate to the public wireless device 5. O. Upon reception of the “registration” signal from the subsequent terminal, it is detected that registration has been performed during a call, and an “HO.execution instruction” signal is transmitted to the call control device 4d in order to prompt the execution of the handover.

FIG. 30 is a functional block diagram of the call control device 4d according to the present embodiment.
The call control device 4d is a B2BUA, and includes a control unit 410, a communication unit 420, an address conversion unit 440, and a call control unit 450d. The control unit 410, the communication unit 420, and the address conversion unit 440 are the same as those in the first embodiment. The call control means 450d executes VoIP call control based on the received call control signal, and performs first switching call connection activation means 481, first session change instruction means 482, and second switching call connection activation means. 486, a disconnection request unit 487, and a second session change instruction unit 487.
The first switching call connection activation means 481 is moved to the public wireless device 5 by the H.264 mobile phone. O. The reception of the “registration” signal from the later terminal detects that registration has been performed during a call, O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal. The first session change instruction means 482 receives the H. O. The audio stream from the terminal 2d is H.264. O. In order to transmit directly to a later terminal, O. A “session change” signal is transmitted to the terminal 2d.
The second switching call connection activation means 486 is provided with the H.264 O. When the “HO execution instruction” signal is received from the in-home device 3d that is the handover destination of the terminal 1d, O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal. The second session change instructing unit 487 receives the H.E. O. In order to transmit the audio stream from the terminal 2d to the in-home device 3d, the H. O. A “session change” signal is transmitted to the terminal 2d.

Next, the operation of the VoIP system according to the present embodiment will be described.
H. O. Since the operation flow for determining network movement in the terminal 1d is the same as that in FIG. 6 of the first embodiment, the handover procedure will be described below.

FIG. O. It is a figure which shows the hand-over procedure which the terminal 1d moved from the subordinate apparatus 3d subordinate to the public radio | wireless apparatus 5 under a telephone call.
Before handover, H. O. Terminal 1d (HO previous terminal) and H. O. An in-home device 3d and a call control device 4d exist between the terminals 2d. O. Between the previous terminal and the home device 3d, between the home device 3d and the call control device 4d, between the call control device 4d and the H. O. The call path is terminated with the terminal 2d. H. O. Between the previous terminal and the home device 3d, the home device 3d and the H. O. The audio stream is terminated with the terminal 2d. H. O. The call path between the previous terminal and the in-home device 3d is the call path A, the call path between the in-home device 3d and the call control device 4d is the call path B, the call control device 4d and the H. O. A call path with the terminal 2d is defined as a call path C.
After the handover, the call path is connected to the call control device 4d and H.264. O. Between the terminal 1d (the post-HO terminal) and the call control device 4d and the H. O. It is terminated with the terminal 2d. The audio stream is H.264. O. The rear terminal and the H. O. It is terminated with the terminal 2d. H. O. The call path between the rear terminal and the call control device 4d is the call path D, and the call control device 4d whose media transmission destination is changed and the H. O. A call path C with the terminal 2d is defined as a call path C ′.

  Step Sd21: The H.D. O. H. Talking with terminal 2d O. The terminal 1d moves under the public wireless device 5, and the determination means 140 O. If it is determined that the network to which the terminal 1d is connected is not a network under the home device 3d, the first registration requesting means 181 O. A “registration” signal is transmitted from the rear terminal to the call control device 4d. At this time, in addition to its own terminal information (IP address and dial-in number) as information in the normal “registration” signal, the call state is “busy”, the call path to be switched (before handover) (switching) Notification is made including that the “path” is “call path A” (optional).

  Step Sd22: The first switching call connection activation means 481 of the call control device 4d O. When a “registration” signal is received from a later terminal, it is determined that a request for handover is made because the call state includes information indicating “busy”, and the mobile terminal is moving between networks during the call. H., et al. O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal. At this time, it is notified that the call path (switching path) to be switched (before the handover) is “call path A”. H. O. When the first path switching means 182 of the rear terminal d receives the “switching call connection” signal from the call control device 4d, the first call switching unit 182 switches the call path A before the handover after the handover established by the “switching call connection” signal. Switch to call path D. Further, H.C. O. The audio stream from the subsequent terminal is H.264. O. It changes so that it may transmit directly to the terminal 2d.

  Steps Sd23, Sd24: H.D. O. The first disconnect request unit 183 of the previous terminal uses the H.264 to disconnect the call path before the handover. O. A “disconnect request” signal is transmitted from the previous terminal to the call control device 4d via the in-home device 3d. Thereby, the call paths A and B are disconnected.

  Step Sd25: The first session change instruction means 482 of the call control device 4d O. The audio stream from the terminal 2d is H.264. O. In order to transmit directly to a later terminal, O. A “session change” signal is transmitted to the terminal 2d. As a result, the H.E. O. The audio stream from the terminal 2d is H.264. O. It is sent directly to the later terminal.

  FIG. 32 shows a sequence diagram when the handover procedure shown in FIG. 31 is realized by SIP. The parentheses after the step number indicate the corresponding step in FIG.

  Steps Sd31 to Sd33: H.I. O. The terminal 1d (HO previous terminal) O. When an “INVITE” signal for starting a call is transmitted to the terminal 2d, the SIP URL “1111” of the caller is converted from the in-home device 3d to “03-XXXX-1111 @ yyy” and transmitted to the call control device 4d. . The call control device 4d receives the H.D. O. From the SIP URL of the terminal 2d, O. It is converted to the IP address of the terminal 2d, and the H. O. An “INVITE” signal is transmitted to the terminal 2d. H. O. Upon receiving the “INVITE” signal, the terminal 2 d returns a final response “200” signal indicating that the incoming call has been successful. The call control device 4d transmits a final response “200” signal to the in-home device 3d. O. A final response “200” signal is transmitted to the previous terminal. Then, the H.O. O. The terminal 1d returns an “ACK” signal as a confirmation response to the final response “200” signal to the in-home device 3d. The in-home device 3d transmits an “ACK” signal to the call control device 4d. O. An “ACK” signal is transmitted to the terminal 2d. As a result, H.C. O. The call path A is between the terminal 1d and the in-home device 3d, and the call path B is between the in-home device 3d and the call control device 4d. O. A call path C is established between the terminals 2d.

  Step Sd34: H. O. When the previous terminal moves under the public wireless device 5, it detects the movement of the network.

  Step Sd35 (Step Sd21): H. O. The rear terminal (HO terminal 1d) transmits a “REGISTER” (registration) signal to the call control device 4d. The “REGISTER” signal includes a call state parameter set to “busy” and a switching path parameter set to “call path A”.

  Step Sd36 (Step Sd22): When the call control device 4d receives the “REGISTER” signal, the call control device 4d determines that the handover is requested because the call state parameter is “busy”. O. An “INVITE” (switching call connection) signal is transmitted to the subsequent terminal. The “INVITE” signal includes a Replaces parameter in which “call path A” is set. H. O. When the rear terminal receives the “INVITE” signal from the call control device 4d, it returns a final response “200” signal to the call control device 4d, and the call control device 4d receives ““ as a confirmation response to the final response “200” signal. ACK "signal O. Send it back to the terminal. As a result, H.C. O. The rear terminal establishes a call path D with the call control device 4d, and switches the call path A before the handover notified by the “INVITE” signal to the call path D established after the handover. Further, H.C. O. The audio stream from the subsequent terminal is H.264. O. It changes so that it may transmit directly to the terminal 2d.

  Steps Sd37 and Sd38 (Steps Sd23 and Sd24): O. The previous terminal transmits a “BYE” (disconnect request) signal to the call control device 4d via the home device 3d, and the call control device 4d returns a final response “200” signal via the home device 3d. . Thereby, the call paths A and B are disconnected.

  Step Sd39 (Step Sd25): The call control device 4d O. A “re-INVITE” (session change) signal is transmitted to the terminal 2d. In the “re-INVITE” signal, the RTP (Real-Time Transport Protocol) transmission destination of the call path C is set to H.264. O. Instructions for changing to the address of the later terminal are included. H. O. The terminal 2d returns a final response “200” signal, and the call control device 4d receives an “ACK” signal as an acknowledgment signal for the final response “200” signal. O. Transmit to terminal 2d. As a result, the H.E. O. A call path C 'is established between the terminal 2d and the call control device 4d. O. The audio stream from the terminal 2d is H.264. O. It is sent directly to the later terminal.

FIG. O. It is a figure which shows the hand-over procedure which the terminal 1d moved to the subordinate apparatus 3d subordinate from the public radio | wireless apparatus 5 during a telephone call.
Before the handover, the call path is connected to the call control device 4d and the H.264. O. Between the terminal 1d (HO previous terminal) and the call control device 4d and the H. O. It is terminated with the terminal 2d. The audio stream is H.264. O. The previous terminal and the H. O. It is terminated with the terminal 2d. H. O. The call path between the previous terminal and the call control device 4d is a call path A, the call control device 4d and the H. O. A call path with the terminal 2d is defined as a call path B.
After the handover, H. O. The terminal 1d (HO post terminal) and the H. O. An in-home device 3d and a call control device 4d exist between the terminals 2d. O. Between the back terminal and the home device 3d, between the home device 3d and the call control device 4d, between the call control device 4d and the H. O. The call path is terminated with the terminal 2d. H. O. Between the rear terminal and the home device 3d, the home device 3d and the H. O. The audio stream is terminated with the terminal 2d. H. O. The call path between the rear terminal and the in-home device 3d is the call path C, the call path between the in-home device 3d and the call control device 4d is the call path D, and the call control device 4d whose media transmission destination is changed and the H . O. A call path B with the terminal 2d is defined as a call path B ′.

  Step Sd51: The H.sub. O. H. Talking with terminal 2d O. The terminal 1d (HO previous terminal) moves, and the determination means 140 causes the H.O. O. When it is determined that the network to which the terminal 1d (the post-HO terminal) is connected is an NW subordinate to the in-home device 3d, the H.O. O. The second registration requesting means 186 of the rear terminal O. A “registration” signal is transmitted from the rear terminal to the in-home device 3d. At this time, in addition to its own terminal information (IP address and dial-in number) as information in the normal “registration” signal, the call state is “busy”, the call path to be switched (before handover) (switching) Notification is made including that the “path” is “call path A”.

  Step Sd52: H. of home device 3d. O. The execution instruction means 381 is an H.264 implementation. O. When a “registration” signal is received from a later terminal, the information indicating that the call state is “busy” is included. Is transmitted to the call control device 4d. At this time, as information necessary for setting the call path after the handover, the terminal (switching terminal) that switches the call path before and after the handover is the “HO. ) Is notified that the call path (switching path) is “call path A”.

  Steps Sd53, Sd54: When the second switching call connection activation means 486 of the call control device 4d receives the “HO. Execution instruction” signal from the in-home device 3d, the H.O. O. In order to switch the call path before the handover to the call path after the handover at the subsequent terminal, O. A “switching call connection” signal is transmitted to the subsequent terminal. At this time, it is notified that the call path (switching path) to be switched (before the handover) is “call path A”. Note that the “switching call connection” signal is an H.264 signal. O. Since it is transmitted via the in-home device 3d existing between the rear terminal and the call control device 4d, a call path D is set between the call control device 4d and the in-home device 3d. H. O. When the rear terminal receives the “switching call connection” signal transmitted from the in-home device 3d, the rear terminal switches the communication path A before the handover to the communication path C after the handover established by the “switching call connection” signal. Further, H.C. O. The audio stream from the rear terminal is transmitted to the in-home device 3d.

  Step Sd55: H. O. The second disconnection request unit 188 of the previous terminal transmits a disconnection request to the call control device 4d to disconnect the call path A in order to disconnect the call path before the handover.

  Step Sd56: The second session change instruction means 487 of the call control device 4d O. In order to transmit the audio stream from the terminal 2d to the in-home device 3d, the H. O. A “session change” signal is transmitted to the terminal 2d. As a result, the H.E. O. The session of the call path B with the terminal 2d is changed (call path B '). O. The audio stream from the terminal 2d is transmitted to the in-home device 3d through the call path B '.

  FIG. 34 shows a sequence diagram when the handover procedure shown in FIG. 33 is realized by SIP. The parentheses after the step number indicate the corresponding step in FIG.

  Steps Sd61 to Sd62: H.D. O. The terminal 1d (HO previous terminal) receives the H.0 via the call control device 4d. O. An “INVITE” signal for starting a call is transmitted to the terminal 2d. H. O. Upon receiving the “INVITE” signal, the terminal 2 d returns a final response “200” signal indicating that the incoming call has been successful, via the call control device 4 d. O. The terminal 2d sends an “ACK” signal as an acknowledgment to the final response “200” signal via the call control device 4d. O. Transmit to terminal 2d. As a result, H.C. O. The call path A is between the terminal 1d (HO previous terminal) and the call control device 4d, and the call control device 4d and the H. O. A call path B is established between the terminals 2d.

  Step Sd63: H. O. The terminal 1d moves under the home device 3d. H. O. The terminal 1d detects network movement.

  Step Sd64 (Step Sd51): O. The rear terminal (HO terminal 1d) transmits a “REGISTER” (registration) signal to the in-home device 3d. The “REGISTER” signal includes a call state parameter set to “busy” and a switching path parameter set to “call path A”.

  Step Sd65 (Step Sd52): The home device 4d O. When the “REGISTER” signal is received from the subsequent terminal, it is determined that the handover is requested because the call state parameter is “busy”, and the “REFER” (HO execution instruction) signal is sent to the call control device 4d. Send. The “REFER” signal includes a Refer-to parameter in which “HO. Post-terminal” is set and a Replaces parameter in which “call path A” is set.

  Steps Sd66, Sd67 (Steps Sd53, Sd54): The call control device 4d transmits an “INVITE” (switching call connection) signal. At this time, the Replaces parameter in which “call path A” is set as the call path (switching path) to be switched (before handover) is included. The in-home device 3d transmits the “INVITE” signal received from the call control device 4d to the H.264. O. Send to a later terminal. H. O. The rear terminal returns a final response “200” signal to the call control device 4d via the home device 3d, and the call control device 4d sends an “ACK” signal as an acknowledgment to the final response “200” signal to the home device. Through the device 3d. O. Send it back to the terminal. As a result, H.C. O. A call path C is established between the rear terminal and the in-home device 3d, and a call path D is established between the in-home device 3d and the call control device 4d. H. O. The rear terminal switches the call path A before the handover to the call path C, O. The audio stream from the rear terminal is transmitted to the in-home device 3d.

  Step Sd68 (Step Sd55): O. The previous terminal transmits a “BYE” (disconnect request) signal to the call control device 4d. H. O. The previous terminal returns a final response “200” signal and disconnects the call path A.

  Step Sd69 (Step Sd56): The call control device 4d O. A “re-INVITE” (session change) signal is transmitted to the terminal 2d. In the “re-INVITE” signal, the RTP transmission destination change of the call path B is notified (call path B ′). H. O. The terminal 2d returns a final response “200” signal, and the call control device 4d receives an “ACK” signal as an acknowledgment signal for the final response “200” signal. O. Transmit to terminal 2d. As a result, the H.E. O. The audio stream from the terminal 2d is transmitted to the in-home device 3d through the call path B '.

  H. O. Terminals 1a, 1b, 1c, 1d, H. O. The terminals 2a, 2b, 2c, and 2d, the in-home devices 3a, 3b, 3c, and 3d, and the call control devices 4a, 4b, 4c, and 4d each have a computer system. And the above-mentioned H.P. O. Determination unit 140 and call control unit 150a of terminal 1a; O. Determination unit 140 and call control unit 150b of terminal 1b; O. Determination means 140 and call control means 150c of the terminal 1c; O. The determination means 140 and call control means 150d of the terminal 1d, O. The call control means 250a of the terminal 2a, the H. O. Call control means 250b of terminal 2b; O. The call control means 250c of the terminal 2c; O. Call control means 250d of terminal 2d, call control means 350a of in-home apparatus 3a, call control means 350b of in-home apparatus 3b, call control means 350c of in-home apparatus 3c, call control means 350d of in-home apparatus 3d, call of call control apparatus 4a The operation process of the control means 450a, the call control means 450b of the call control device 4b, the call control means 450c of the call control device 4c, and the call control means 450d of the call control device 4d is a computer-readable record in the form of a program. The above-described processing is performed when the computer system reads and executes this program stored in a medium. The computer system here includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

1 is a configuration diagram of a VoIP system according to an embodiment of the present invention. FIG. H. according to the first embodiment. O. It is a functional block diagram of a terminal. The H.D. according to the first embodiment. O. It is a functional block diagram of a terminal. It is a functional block diagram of the household device by a 1st embodiment. It is a functional block diagram of the call control device by a 1st embodiment. H. according to the first embodiment. O. It is an operation | movement flow of the movement determination of a terminal's network. It is a figure which shows the hand-over procedure by 1st Embodiment. It is a sequence diagram at the time of using SIP for the handover procedure shown in FIG. It is a figure which shows the hand-over procedure by 1st Embodiment. FIG. 10 is a sequence diagram when SIP is used in the handover procedure shown in FIG. 9. H. according to the second embodiment. O. It is a functional block diagram of a terminal. The H.D. O. It is a functional block diagram of a terminal. It is a functional block diagram of the household device by 2nd Embodiment. It is a functional block diagram of the call control apparatus by 2nd Embodiment. It is a figure which shows the hand-over procedure by 2nd Embodiment. FIG. 16 is a sequence diagram when SIP is used in the handover procedure shown in FIG. 15. It is a figure which shows the hand-over procedure by 2nd Embodiment. It is a sequence diagram at the time of using SIP for the handover procedure shown in FIG. H. according to the third embodiment. O. It is a functional block diagram of a terminal. According to the third embodiment. O. It is a functional block diagram of a terminal. It is a functional block diagram of the household device by 3rd Embodiment. It is a functional block diagram of the call control apparatus by 3rd Embodiment. It is a figure which shows the hand-over procedure by 3rd Embodiment. FIG. 24 is a sequence diagram when SIP is used in the handover procedure shown in FIG. 23. It is a figure which shows the hand-over procedure by 3rd Embodiment. FIG. 26 is a sequence diagram when SIP is used in the handover procedure shown in FIG. 25. H. according to the fourth embodiment. O. It is a functional block diagram of a terminal. According to the fourth embodiment. O. It is a functional block diagram of a terminal. It is a functional block diagram of the household device by 4th Embodiment. It is a functional block diagram of the call control apparatus by 4th Embodiment. It is a figure which shows the handover procedure by 4th Embodiment. FIG. 32 is a sequence diagram when SIP is used in the handover procedure shown in FIG. 31. It is a figure which shows the hand-over procedure by 4th Embodiment. It is a sequence diagram at the time of using SIP for the handover procedure shown in FIG.

Explanation of symbols

1, 1a, 1b, 1c, 1d. O. Terminals 2, 2a, 2b, 2c, 2d. O. Terminal 3, 3a, 3b, 3c, 3d ... In-home device 4, 4a, 4b, 4c, 3d ... Call control device 5 ... Public wireless device 110 ... Control means 120 ... First communication means 130 ... Second communication means 140 ... determination means 150a, 150b, 150c, 150d ... call control means 151 ... first registration request means 152 ... first switching call connection activation means 156 ... second registration request means 157 ... second switching call connection Activation means 161... First registration request means 162. First path switching means 163. First disconnect request means 166. Second registration request means 167. Second path switch means 168. 171: First registration requesting unit 172: First path switching unit 173: First disconnection requesting unit 176: Second registration requesting unit 177: Second path switching unit 181: First registration requesting unit 182 ... First path switching means 183 ... First disconnect request means 186 ... Second registration request means 187 ... Second path switch means 188 ... Second disconnect request means 210 ... Control means 220 ... Communication means 250a, 250b, 250c, 250d ... call control means 251 ... first switching means 252 ... first disconnection request means 256 ... second switching means 257 ... second disconnection request means 261 ... first switching call connection activation means 266 ... second switching call connection activation means 276 ... path switching means 277 ... disconnection request means 281 ... first session change means 282 ... second session change means 310 ... control means 320 ... first communication means 330 ... Second communication means 350a, 350b, 350c, 350d... Call control means 351. O. Execution instruction transmission means 361. O. Implementation instruction means 366... O. Execution instructing means 371... First switching call connection activation means 376... Second switching call connection activation means 377... Third switching call connection activation means 381. O. Execution instructing means 410 ... control means 420 ... communication means 450a, 450b, 450c, 450d ... call control means 440 ... address conversion means 451 ... H. O. Notification means 461... O. Notification means 471. O. Implementation instruction means 481... First switching call connection activation means 482... First session change instruction means 486... Second switching call connection activation means 487.

Claims (12)

A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device;
During a call via the VoIP terminal connected to the IP network and the VoIP termination device, the movement during a call when the determination means determines that the wireless access destination has been changed to the wireless device Registration request means for transmitting a registration signal in which information indicating that is transmitted to the call control device via the wireless device;
The VoIP termination received from the handover execution instruction signal is received from the VoIP termination apparatus via the wireless apparatus, and is transmitted from the handover execution instruction signal to the communication destination VoIP terminal indicated by the terminal identification acquired from the handover execution instruction signal A switching call connection activation unit configured to transmit a switching call connection signal in which information of a communication path between the apparatus and the communication destination VoIP terminal is set and to establish a communication path between the communication destination VoIP terminal and the communication destination VoIP terminal; ,
The call control device includes:
When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, the terminal identification of the VoIP terminal is set in the VoIP terminal device A handover notification means for transmitting a handover notification signal;
The VoIP terminator is
A call path between the call destination VoIP terminal and a call path between the call destination VoIP terminal and the VoIP terminal indicated by the terminal identification obtained from the handover notification signal by receiving the handover notice signal from the call control apparatus; A handover instruction transmitting means for transmitting a handover execution instruction signal in which the information is set,
The destination VoIP terminal
To a call path that receives a switching call connection signal from the VoIP terminal, establishes a call path with the VoIP terminal, and establishes a call path with the VoIP terminator indicated by the received switching call connection signal Switching means for switching;
A disconnection request means for transmitting a disconnection request signal for a call path before switching to the VoIP terminal via the in-home device;
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determining means for determining that the wireless access destination has been changed from the wireless device to the VoIP termination device;
During a call via the wireless device with a callee VoIP terminal connected to the IP network, when the determination means determines that the wireless access destination has been changed to the VoIP terminator, the call is made via the VoIP terminator. Then, a switching call connection signal in which information on a call path with the call destination VoIP terminal is set as a switching path is transmitted to the call destination VoIP terminal to establish a voice path with the VoIP terminator. An activation means,
The VoIP terminator is
A switching call connection signal is received from the VoIP terminal to establish a voice path with the VoIP terminal, and the received switching call connection signal is transmitted to the call destination VoIP terminal to communicate with the communication destination VoIP terminal. Call control means for establishing a voice path of
The destination VoIP terminal is
A switching call connection signal is received from the VoIP termination device, a voice path is established with the VoIP termination device, and a voice path is established between the VoIP terminal indicated by the switching path in the switching call connection signal. Switching means for switching to the established voice path;
A disconnect request means for transmitting a voice path disconnect request before switching to the VoIP terminal;
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device;
When a call is made via the VoIP terminal connected to the call destination VoIP terminal connected to the IP network and the determination means determines that the wireless access destination is changed to the wireless device, the terminal of the call destination VoIP terminal Registration request means for transmitting a registration signal in which identification and information indicating that a call is in progress are set to the call control device via the wireless device;
A switching call connection signal is received from the call destination VoIP terminal, a call path is established with the call destination VoIP terminal via the public wireless device, and the VoIP indicated by the switching path in the switching call connection signal Path switching means for switching the call path with the terminating device to the established call path;
A disconnection requesting means for transmitting a disconnection request signal for a call path before switching to the callee VoIP terminal via the VoIP terminator,
The call control device includes:
When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, the call of the VoIP terminal that is the transmission source of the registration signal is received. A handover notification means for transmitting a handover notification signal in which the terminal identification of the call destination VoIP terminal acquired from the registration signal is set to the VoIP termination device that is terminated;
The VoIP terminator is
A handover notification signal is received from the call control device, and the call destination VoIP terminal indicated by the terminal identification obtained from the handover notification signal is transferred to the terminal identification of the VoIP terminal as a switching terminal and between the VoIP terminal as a switching path A handover execution instruction means for transmitting a handover execution instruction signal in which the call path information is set,
The destination VoIP terminal is
For switching by receiving a handover execution instruction signal from the VoIP terminal device, acquiring a terminal identification and switching path from the handover execution instruction signal, and setting the acquired switching path information to the VoIP terminal indicated by the acquired terminal identification Comprising a switching call connection activation means for transmitting a call connection signal, establishing a call path with the VoIP terminal, and switching to a call path with which a call path with the VoIP terminal device is established;
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determining means for determining that the wireless access destination has been changed from the wireless device to the VoIP termination device;
During a call via the wireless device with a call destination VoIP terminal connected to the IP network, when the determination means determines that the wireless access destination has been changed to the VoIP termination device, the call destination VoIP terminal Registration request means for transmitting a registration signal in which terminal identification and information indicating movement during a call are set to the VoIP terminator;
A switching call connection signal transmitted from the call destination VoIP terminal via the VoIP termination device is received, a call path with the VoIP termination device is established, and a call path with the call destination VoIP terminal A path switching means for switching to an established call path;
A disconnect request means for transmitting a call path disconnection request with the callee VoIP terminal to the callee VoIP terminal;
The VoIP terminator is
When a registration signal is received from the VoIP terminal and the information indicating movement during a call is included in the registration signal, the registration signal is transmitted to the call destination VoIP terminal indicated by the terminal identification obtained from the registration signal. A handover execution instruction means for transmitting a handover execution instruction signal in which the terminal identification of the VoIP terminal that is the source of the transmission is set;
The switching call connection signal is received from the call destination VoIP terminal, a call path is established with the call destination VoIP terminal, the call connection signal for switching is transmitted to the VoIP terminal, and the VoIP terminal A call control means for establishing a call path of
The destination VoIP terminal is
A handover execution instruction signal is received from the VoIP terminator, a switching call connection signal is transmitted to the VoIP terminator, a call path is established with the VoIP terminator, and established with the VoIP terminal A call connection activation means for switching to switch the established call path to the established call path,
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device;
During a call via the VoIP terminal connected to the IP network and the call destination VoIP terminal, when the determination unit determines that the wireless access destination has been changed to the wireless device, the call destination VoIP terminal A registration request means for transmitting a registration signal in which a switching path indicating a call path between and a information indicating that a call is in progress is set to the call control device via the wireless device;
A switching call connection signal is received from the VoIP termination device via the wireless device, a call path is established through the wireless device with the VoIP terminal, and has already been established between the VoIP termination device. Path switching means for switching the call path to a call path via the wireless device;
A disconnect request means for directly transmitting a call path disconnection request established directly with the VoIP terminator to the VoIP terminator;
The call control device includes:
When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, the terminal identification of the VoIP terminal is set in the VoIP terminal device A handover execution instruction means for transmitting a handover execution instruction signal;
The VoIP terminator is
A handover execution instruction signal is received from the call control apparatus, a switching call connection signal is transmitted to the VoIP terminal indicated by the terminal identification acquired from the handover execution instruction signal via the wireless apparatus, and the A call path activation means for switching for establishing a call path with the VoIP terminal and switching a call path already established with the VoIP terminal to a call path via the wireless device;
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determining means for determining that the wireless access destination has been changed from the wireless device to the VoIP termination device;
During a call via the wireless device with a call destination VoIP terminal connected to the IP network, when the determination means determines that the wireless access destination has been changed to the VoIP termination device, the call destination VoIP terminal Registration request means for transmitting a registration signal in which terminal identification and information indicating movement during a call are set to the VoIP terminating device;
Path switching that receives a switching call connection signal from the VoIP terminator, establishes a call path with the VoIP terminator, and switches the call path with the call destination VoIP terminal to the established call path Means and
The VoIP terminator is
When a registration signal is received from the VoIP terminal and information indicating movement during a call is included in the registration signal, a switching call connection signal is transmitted to the VoIP terminal that is the transmission source of the registration signal, and the VoIP A call for switching that establishes a call path with the call destination VoIP terminal by establishing a call path with the call destination VoIP terminal while establishing a call path with the terminal and transmitting a call connection signal for switching to the call destination VoIP terminal indicated by the registration signal A connection activation means,
The destination VoIP terminal is
A path that receives a switching call connection signal from the VoIP terminator, establishes a call path with the VoIP terminator, and switches the call path established with the VoIP terminal to the established call path Switching means;
A disconnect request means for transmitting a call path disconnect request signal before switching to the VoIP terminal;
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and terminates a call path, and communicates with the call control apparatus via an IP network and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device;
During a call via the VoIP terminal connected to the IP network and the VoIP terminal device, when the determination unit determines that the wireless access destination has been changed to the wireless device, the communication is in progress Registration request means for transmitting a registration signal set with information to the call control device via the wireless device;
Path switching means for receiving a switching call connection signal from the call control device, establishing a call path with the call control device, and switching a call path with the in-home device to the established call path; ,
A disconnect request means for directly transmitting a call path disconnection request established directly with the VoIP terminator to the VoIP terminator;
The VoIP terminator is
A disconnection request that receives a disconnection request from a VoIP terminal, disconnects a call path with the VoIP terminal, and transmits a call path disconnection request established with the call control apparatus to the call control apparatus With means,
The call control device includes:
When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, a call connection signal for switching is returned and the VoIP terminal A call connection activation means for switching to establish a call path between,
Session change instruction means for instructing the destination VoIP terminal to change the transmission destination of the audio media from the VoIP termination device to the VoIP terminal;
The destination VoIP terminal is
A session changing unit that receives an instruction from the call control device and changes the transmission destination of the audio media from the VoIP terminal device to the VoIP terminal;
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and terminates a call path, and communicates with the call control apparatus via an IP network and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determining means for determining that the wireless access destination has been changed from the wireless device to the VoIP termination device;
During a call via the wireless device with a callee VoIP terminal connected to the IP network, when the determination means determines that the wireless access destination has been changed to the VoIP termination device, A registration request means for transmitting a registration signal in which a switching path indicating a call path between the communication path and information indicating movement during a call is set to the VoIP terminating device;
A switching call connection signal is received from the VoIP terminator, and a call path is established with the VoIP terminator, and a call path is established with the call control device indicated by the switching call connection. Path switching means for switching to the call path
A disconnect request means for transmitting a call path disconnection request before switching to the call control device via the wireless device;
The VoIP terminator is
When a registration signal is received from the VoIP terminal and information indicating movement during a call is included in the registration signal, a handover execution instruction signal in which terminal identification of the VoIP terminal is set is transmitted to the call control apparatus A handover execution instructing means,
A switching call connection signal is received from the call control device, a call path is established with the call control device, and the received switching call connection signal is transmitted to the VoIP terminal. A call control means for establishing a call path of
The call control device includes:
A switching call connection signal in which switching path information indicating a call path between the VoIP terminal indicated by the terminal identification received from the handover execution instruction signal and receiving a handover execution instruction signal from the VoIP terminal apparatus is set, Switching call connection activation means for transmitting via the VoIP terminator and establishing a call path with the VoIP terminator;
Session change instruction means for instructing the destination VoIP terminal to change the transmission destination of the audio media from the VoIP terminal to the VoIP terminal device;
The destination VoIP terminal is
A session changing unit that receives an instruction from the call control device and changes a transmission destination of the voice media from the VoIP terminal to the VoIP terminating device;
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device or from the wireless device to the VoIP termination device;
During a call via the VoIP terminal connected to the IP network and the VoIP termination device, the movement during a call when the determination means determines that the wireless access destination has been changed to the wireless device Registration request means for transmitting a registration signal in which information indicating that is transmitted to the call control device via the wireless device;
The VoIP termination received from the handover execution instruction signal is received from the VoIP termination apparatus via the wireless apparatus, and the communication destination VoIP terminal indicated by the terminal identification acquired from the handover execution instruction signal First switching call connection activation means for transmitting a switching call connection signal in which information of a communication path between the apparatus and the communication destination VoIP terminal is set, and establishing a communication path between the communication destination VoIP terminal and the communication destination VoIP terminal When,
During a call via the wireless device with a callee VoIP terminal connected to the IP network, when the determination means determines that the wireless access destination has been changed to the VoIP terminator, the call is made via the VoIP terminator. A switching call connection signal in which information of a call path with the call destination VoIP terminal is set as a switching path to the call destination VoIP terminal, and a voice path is established with the VoIP terminator. Switching call connection activation means,
The call control device includes:
When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, the terminal identification of the VoIP terminal is set in the VoIP terminal device A handover notification means for transmitting a handover notification signal;
The VoIP terminator is
A call path between the call destination VoIP terminal and a call path between the call destination VoIP terminal and the VoIP terminal indicated by the terminal identification obtained from the handover notification signal by receiving the handover notice signal from the call control apparatus; A handover instruction transmitting means for transmitting a handover execution instruction signal in which the information is set;
A switching call connection signal is received from the VoIP terminal to establish a voice path with the VoIP terminal, and the received switching call connection signal is transmitted to the call destination VoIP terminal to communicate with the communication destination VoIP terminal. Call control means for establishing a voice path of
The destination VoIP terminal
Switching means for receiving the switching call connection signal, establishing a call path with the transmission source of the switching call connection signal, and switching the switching path indicated by the switching call connection signal to the established call path;
A disconnect request means for transmitting a call path disconnection request signal before switching to the establishment destination of the call path before switching,
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device or from the wireless device to the VoIP termination device;
Information indicating that a call is being made and the terminal identification of the call-destination VoIP terminal when the wireless access destination is changed by the determination means during a call with a call-destination VoIP terminal connected to the IP network A registration request means for transmitting a registration signal set to the call control device via the changed access-destination wireless device or to the changed access-destination VoIP termination device;
Path switching means for receiving a switching call connection signal, establishing a call path with the switching call connection signal transmission source, and switching the already established call path to a newly established call path;
A disconnect request means for transmitting a call path disconnection request signal before switching to the establishment destination of the call path before switching,
The call control device includes:
When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, the call of the VoIP terminal that is the transmission source of the registration signal is received. A handover notification means for transmitting a handover notification signal in which the terminal identification of the call destination VoIP terminal acquired from the registration signal is set to the VoIP termination device that is terminated;
The VoIP terminator is
A handover notification signal is received from the call control device, and the call destination VoIP terminal indicated by the terminal identification obtained from the handover notification signal is transferred to the terminal identification of the VoIP terminal as a switching terminal and between the VoIP terminal as a switching path First handover execution instructing means for transmitting a handover execution instruction signal in which the information of the call path is set;
When a registration signal is received from the VoIP terminal and the information indicating movement during a call is included in the registration signal, the registration signal is transmitted to the call destination VoIP terminal indicated by the terminal identification obtained from the registration signal. Second handover execution instructing means for transmitting a handover execution instruction signal in which the terminal identification of the VoIP terminal that is the transmission source is set;
A call connection signal for switching is received from the call destination VoIP terminal, a call path is established with the call destination VoIP terminal, and the call connection signal for switching is transmitted to the VoIP terminal. A call control means for establishing a call path,
The destination VoIP terminal is
During establishment of a call path with the VoIP termination device, a handover execution instruction signal is received from the VoIP termination device, a terminal identification and a switching path are acquired from the handover execution instruction signal, and the VoIP indicated by the acquired terminal identification A switching call connection signal in which information of the acquired switching path is set is transmitted to the terminal, a call path with the VoIP terminal is established, and the call path with the VoIP terminating device is transferred to the established call path. First switching call connection activation means for switching;
During establishment of a call path with the VoIP terminal, a handover execution instruction signal is received from the VoIP terminator, a switching call connection signal is transmitted to the VoIP terminator, and a call path with the VoIP terminator is established. A second switching call connection activation unit configured to switch the established call path to the established call path with the established VoIP terminal.
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and proxies a call path, communicates with the call control apparatus via an IP network, and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device or from the wireless device to the VoIP termination device;
During a call via the VoIP terminal connected to the IP network and the call destination VoIP terminal, when the determination unit determines that the wireless access destination has been changed to the wireless device, the call destination VoIP terminal A first registration request means for transmitting a registration signal in which a switching path indicating a call path between and a information indicating that a call is in progress is set to the call control device via the wireless device;
A switching call connection signal is received from the VoIP termination device via the wireless device, and a call path is established between the VoIP terminal and the wireless device, and the already established call path is replaced with the established call path. Path switching means for switching to,
A disconnect request means for directly transmitting a call path disconnection request established with the VoIP terminator directly to the VoIP terminator;
During a call via the wireless device with a call destination VoIP terminal connected to the IP network, when the determination means determines that the wireless access destination has been changed to the VoIP termination device, the call destination VoIP terminal A second registration requesting unit configured to transmit a registration signal in which terminal identification and information indicating movement during a call are set to the VoIP terminal device;
The call control device includes:
When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, the terminal identification of the VoIP terminal is set in the VoIP terminal device A handover execution instruction means for transmitting a handover execution instruction signal;
The VoIP terminator is
A handover execution instruction signal is received from the call control apparatus, a switching call connection signal is transmitted to the VoIP terminal indicated by the terminal identification acquired from the handover execution instruction signal via the wireless apparatus, and the A first switching call connection activation means for establishing a call path with the VoIP terminal and switching a call path already established with the VoIP terminal to a call path via the wireless device;
When a registration signal is received from the VoIP terminal and information indicating movement during a call is included in the registration signal, a switching call connection signal is transmitted to the VoIP terminal that is the transmission source of the registration signal, A call path is established with the VoIP terminal, and a switching call connection signal is transmitted to the call destination VoIP terminal indicated by the registration signal to establish a call path with the call destination VoIP terminal. Comprising two switching call connection activation means,
The destination VoIP terminal is
A path that receives a switching call connection signal from the VoIP terminator, establishes a call path with the VoIP terminator, and switches the call path established with the VoIP terminal to the established call path Switching means;
A disconnect request means for transmitting a call path disconnect request signal before switching to the VoIP terminal;
VoIP system characterized by the above. A VoIP (Voice over IP) terminal, a call control apparatus that performs VoIP call control and terminates a call path, and communicates with the call control apparatus via an IP network and communicates with the VoIP terminal wirelessly A VoIP system comprising a device and a wireless device for performing wireless access from the VoIP terminal to the IP network,
The VoIP terminal is
First communication means for wirelessly connecting to the VoIP terminator;
Second communication means for wirelessly connecting to the wireless device;
Determination means for determining that the wireless access destination has been changed from the VoIP termination device to the wireless device or from the wireless device to the VoIP termination device;
During a call via the VoIP terminal connected to the IP network and the VoIP terminal device, when the determination unit determines that the wireless access destination has been changed to the wireless device, the communication is in progress First registration request means for transmitting a registration signal set with information to the call control device via the wireless device;
During a call via the wireless device with a callee VoIP terminal connected to the IP network, when the determination means determines that the wireless access destination has been changed to the VoIP termination device, A second registration request means for transmitting a registration signal in which a switching path indicating a call path between the communication path and information indicating movement during a call is set to the VoIP terminator;
Path switching means for receiving a switching call connection signal, establishing a call path with the transmission source of the switching call connection signal, and switching a previously established call path to a newly established call path;
A disconnect request means for transmitting a call path disconnection request before switching to the establishment destination of the call path before switching,
The VoIP terminator is
A disconnection request that receives a disconnection request from a VoIP terminal, disconnects a call path with the VoIP terminal, and transmits a call path disconnection request established with the call control apparatus to the call control apparatus Means,
When a registration signal is received from the VoIP terminal and information indicating movement during a call is included in the registration signal, a handover execution instruction signal in which terminal identification of the VoIP terminal is set is transmitted to the call control apparatus A handover execution instructing means,
A switching call connection signal is received from the call control device, a call path is established with the call control device, and the received switching call connection signal is transmitted to the VoIP terminal. A call control means for establishing a call path of
The call control device includes:
When a registration signal is received from the VoIP terminal via the wireless device and the information indicating movement during a call is included in the registration signal, a call connection signal for switching is returned and the VoIP terminal First switching call connection activation means for establishing a call path between the two;
A switching call connection signal in which switching path information indicating a call path between the VoIP terminal indicated by the terminal identification received from the handover execution instruction signal and receiving a handover execution instruction signal from the VoIP terminal apparatus is set, Second switching call connection activation means for transmitting via the VoIP terminator and establishing a call path with the VoIP terminator;
Session change instruction means for instructing the call destination VoIP terminal to change to the call path where the transmission destination of the audio media is established;
The destination VoIP terminal is
Session changing means for changing the destination of the audio media according to an instruction from the call control device;
VoIP system characterized by the above.

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