JP2009194674A - COMMUNICATION TERMINAL DEVICE AND COMMUNICATION TERMINAL DEVICE CONTROL METHOD - Google Patents

Abstract

Transmission of a media stream is performed satisfactorily.
Terminal apparatuses 110A and 100B are connected via an NGN network 211 and the Internet 212. The terminal device 110A can establish a session via the NGN network 211 by dialing the telephone number of the terminal device 110B. The terminal device 110A acquires connection information such as an IP address and a port number from the terminal device 110B through the NGN network 211 after the establishment process of the session via the NGN network 211 or after the establishment. The terminal device 110A uses the connection information described above to connect via the Internet 212 in a state where a session via the NGN network 211 is established or after disconnecting the session via the NGN network 211 as necessary. Establish a session. The terminal device 110A can transmit the media stream to the terminal device 110B via the NGN network 211 or the Internet 212 depending on the type or the like.
[Selection] Figure 1

Description

  The present invention relates to a communication terminal device and a communication terminal device control method. Specifically, the present invention includes first and second network communication units that perform communication with a counterpart communication terminal device through first and second networks, via the first network. A communication terminal capable of satisfactorily transmitting a media stream to the other side by making it possible to establish a session via the second network based on the connection information sent from the other side communication terminal device It relates to the device.

  In recent years, a movement toward the construction of a next generation network (NGN) that replaces a conventional circuit-switched telephone line network with a network based on IP (Internet Protocol) technology has become active (for example, Patent Document 1).

  The NGN is an IP network that has a bandwidth compensation function and a security function in the network itself, and integrates a telephone service, a video communication service, a data communication service, and the like using a session initiation protocol (SIP). .

  In the next-generation network, there is a mechanism that reserves a certain bandwidth for specific communication in advance, and is a guarantee type (quality assurance type) network in which QoS (Quality of Service) is guaranteed. Real-time communication such as video distribution can be performed stably without any interruption or delay in sound or video.

On the other hand, there is the Internet as an IP-based network. The Internet and NGN are completely different networks. That is, the Internet is basically a best-effort network, QoS is not guaranteed, and the communication speed may suddenly decrease. On the other hand, in the next-generation network described above, QoS can be guaranteed by reserving a necessary bandwidth in advance.
JP 2007-159142 A

  The use of the next-generation network described above is very effective for video distribution and the like where stable communication quality is required because QoS is guaranteed, but there is a problem that the communication cost is higher than the use of the Internet. There is. On the other hand, the use of the Internet can reduce communication costs compared to the use of next-generation networks, but there is a problem that QoS is not guaranteed and it is not suitable for moving picture distribution or the like that requires communication quality.

  An object of the present invention is to enable a media stream to be transmitted to the other party satisfactorily.

The concept of this invention is
A first network communication unit that communicates with a counterpart communication terminal device through a first network;
A second network communication unit for communicating with the counterpart communication terminal device through a second network;
A control unit that controls operations of the first network communication unit and the second network communication unit;
The control unit establishes a session via the second network by the second network communication unit based on connection information sent from the counterpart communication terminal device via the first network. The communication terminal device is characterized by the above.

  In this invention, it is possible to communicate with the counterpart terminal device through the first and second networks. That is, a first network communication unit that communicates with the counterpart communication terminal device through the first network, and a second network communication unit that communicates with the counterpart communication terminal device through the second network And are provided. For example, the first network is a guarantee type network such as a next generation network (NGN), and the second network is a best effort type network such as the Internet or an intranet.

  When the second network communication unit establishes a session via the second network, the connection information sent from the counterpart communication terminal device via the first network is used. The operations of the first network communication unit and the second network communication unit are controlled by the control unit.

  For example, when communication via the first network is required together with communication via the second network, a session via the first network is established and the second communication unit further A session via the second network is established. Further, for example, if there is communication via the second network and communication via the first network is unnecessary, the second communication is performed after the session via the first network is disconnected. A session via the second network is established by the unit.

  Thus, in the present invention, since the session via the second network can be established based on the connection information sent from the counterpart communication terminal device via the first network, the first and second The media stream can be satisfactorily transmitted to the counterpart terminal device using either or both of the networks.

  In the present invention, for example, when transmitting a predetermined media stream, the control unit determines whether the media stream is transmitted on the first network or the second network, and the media type of the predetermined media stream. It may be determined according to the band or the telephone number of the other party. In this case, it is not necessary for the user to instruct which network to transmit each time a predetermined media stream is transmitted.

  In this case, for example, for each media type, the user can set whether the media stream is transmitted on the first network or the second network, and the control unit transmits the predetermined media stream to the first network. When determining whether to transmit on the network or to transmit on the second network, it may be determined based on the setting information.

  In addition, for example, the user can set a bandwidth threshold value for determining whether the media stream is transmitted on the first network or the second network, and the control unit transmits the predetermined media stream to the first network stream. When determining whether to transmit on the second network or on the second network, the determination may be made based on the bandwidth threshold.

  In addition, for example, the user can set whether to transmit the media stream on the first network or the second network for each telephone number of the other party, and the control unit transmits the predetermined media stream to the first network number. When determining whether to transmit on the first network or on the second network, the determination may be made based on the setting information.

  According to the present invention, the apparatus includes the first and second network communication units that perform communication with the counterpart communication terminal device through the first and second networks, and the first network and the second network communication unit. A session via the second network can be established based on the connection information sent from the counterpart communication terminal device, and the media stream can be transmitted to the counterpart side satisfactorily.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration example of a communication system 100 as an embodiment. In this communication system 100, a communication terminal device (terminal A) 110 </ b> A and a communication terminal device (terminal B) 110 </ b> B are connected via a next-generation network (NGN) network 211 and the Internet 212.

  FIG. 2 shows a configuration example of the communication terminal device 110 (110A, 110B). The communication terminal device 110 includes a control unit 111, an input unit 112, an output unit 113, an information input / output unit 114, an information storage unit 115, an information processing unit 116, and a network communication unit 117. Yes.

  The control unit 111 controls the operation of each unit of the communication terminal device 110. The control unit 111 includes a CPU (Central Processing Unit) 111a, a ROM (Read Only Memory) 111b, and a RAM (Random Access Memory) 111c. In the control unit 111, for example, the CPU 111a performs various control processes by loading a program stored in the ROM 111b into the RAM 111c and executing the program.

  The input unit 112 includes a keyboard, a mouse, a camera, a microphone, and the like. The output unit 113 includes a display, a speaker, and the like. The information input / output unit 114 includes a removable medium drive such as a magnetic disk, an optical disk, a magneto-optical disk, or a memory card, and various input / output terminals.

  The information storage unit 115 is configured by an HDD (Hard Disk Drive), a nonvolatile memory, or the like. The information storage unit 115 stores various information such as video signals, audio signals, and data input from the information input / output unit 114 described above, or video signals, audio signals, data, and the like transmitted from the counterpart communication terminal. Are stored and held.

  The information processing unit 116 performs processing such as compression / decompression processing and packetizing / depacketizing. That is, the information processing unit 116 performs processing such as compression processing and packetizing on the transmission information read from the information storage unit 115 to generate a transmission media stream. Further, the information processing unit 116 performs processing such as depacketization and decompression processing on the received media stream received by the network communication unit 117 to generate reception information.

  The network communication unit 117 performs communication with the counterpart communication terminal device via the NGN network 211 and the Internet 212. The network communication unit 117 transmits the transmission media stream generated by the information processing unit 116 to the counterpart communication terminal device and supplies the reception media stream received from the counterpart communication terminal device to the information processing unit 116. Here, the network communication unit 117 includes a first network communication unit 121 and a second network communication unit 122.

  The first network communication unit 121 performs communication with the counterpart communication terminal device via the NGN network 211. This communication becomes possible by establishing a session via the NGN network 121 by the first network communication unit 121. The second network communication unit 122 communicates with the counterpart communication terminal device via the Internet 212. This communication becomes possible by establishing a session via the Internet 121 by the second network communication unit 122.

  In order to establish a session via the Internet 121, connection information such as the IP address and port number of the partner communication terminal device is required. This information is sent from the counterpart communication terminal apparatus during or after the session establishment process via the NGN network 121.

  Next, a communication example of the communication system 100 shown in FIG. 1 will be described with reference to the sequence diagram of FIG. Here, communication terminal device 110A will be described as “terminal A”, and communication terminal device 110B will be described as “terminal B”.

  (1) Terminal A transmits to the NGN network 211 an INVITE message in which the dialed telephone number is set to the other party's destination, and its own IP address, voice and data media type, and port number are set to SDP (Session Description Protocol). .

  (2) The NGN network 211 extracts the IP address of the terminal B from the destination (telephone number) of the INVITE message, and transmits the INVITE message to the terminal B.

  (3) Terminal B stores terminal A's IP address, voice and data media type, and port number included in the received INVITE message in the telephone number corresponding area of terminal A in the telephone number corresponding stream control data.

  FIG. 4 shows a configuration example of the telephone number corresponding stream control data. The stream control data consists of an IP address and port information. The port information is a combination of n media types and port numbers.

  (4) As a response to the INVITE message, the terminal B transmits 200 OK, in which its own IP address, voice and data media type, and port number are set to SDP, to the NGN network 211.

  (5) The NGN network 211 transfers the 200 OK to the terminal A from the session information in the 200 OK message received from the terminal B by a known technique.

  FIG. 5 shows a description example of the above-described INVITE message or SDP set to 200 OK. Here, in general, “v” is the protocol version, “o” is the owner / creator and session identifier, “s” is the session name, “c” is the session information, and “t” is the session active Time, “m” represents a media name and transmission address, “b” represents band information, and “a” represents a media attribute line. In the description example of FIG. 5, the IP address (aaa: bbb: ccc: ddd) is described in the portion “c” (the IP address here is the first network communication unit IP address). The media type (audio) and the port number (20000) are described in the first “m” portion. The media type (application) and port number (21000) are described in the next “m” part.

  (6) The terminal A sets the IP address, voice and data media type, and port number of the terminal B included in the received 200 OK to the telephone number corresponding area of the terminal B of the telephone number corresponding stream control data (see FIG. 4). Remember.

  (7) Here, a session is established between the terminal A and the terminal B via the NGN network 211. Then, the terminal A and the terminal B are in voice communication via the NGN network 211. That is, a stream (audio stream) capable of transmitting and receiving an audio signal via the NGN network 211 is established between the terminal A and the terminal B. In addition, a stream (data stream) capable of transmitting and receiving data via the NGN network 211 is established between the terminal A and the terminal B.

  (8) The terminal A refers to the telephone number-corresponding stream control data corresponding to the telephone number of the terminal B, and extracts the IP address of the terminal B, the media type of data transfer, and the port number. Then, a UDP packet in which the media type necessary for video communication and file transfer and the port number are set to SDP is transmitted to the terminal B via the NGN network 211.

  (9) The terminal B uses the media type and port number of the video communication and file transfer of the terminal A included in the received UDP packet (SDP), the port number as the telephone number corresponding area of the terminal A of the telephone number corresponding stream control data (see FIG. 4) ).

  (10) The terminal B refers to the telephone number corresponding stream control data corresponding to the telephone number of the terminal A, extracts the IP address of the terminal A, the media type of data transfer, and the port number. Then, a UDP packet in which the media type necessary for video communication and file transfer and the port number are set to SDP is transmitted to the terminal B via the NGN network 211.

  (11) The terminal A sets the media type and port number of the video communication and file transfer of the terminal B included in the received UDP packet (SDP), the port number, and the telephone number corresponding area of the terminal B of the telephone number corresponding stream control data (see FIG. 4). ).

  FIG. 6 shows a description example of SDP set in the above-described UDP packet (data stream). In the description example of FIG. 6, the IP address (aaa: bbb: ccc: ddd) is described in the portion “c” (the IP address here is the second network communication unit IP address). The media type (video) and port number (30000) are described in the first “m” part. The media type (application) and port number (31000) are described in the next “m” part.

  (12) When performing large-capacity data transfer (FTP) from terminal A to terminal B, if terminal A performs an operation to start data transfer, terminal A performs telephone number compatible stream control corresponding to the telephone number of terminal B. When the data (see FIG. 4) is referred to and the IP address of the terminal B, the media type of the data transfer, and the port number are extracted, the data transfer is performed to the IP address and the port number via the Internet 212.

  (13) Terminal B receives data transmitted from terminal A via the Internet. In this case, a session is established between the terminal A and the terminal B via the Internet 212.

  In the communication example shown in the sequence diagram of FIG. 3 described above, the NGN network 211 is used for transmission of a stream (narrowband stream) of audio and small capacity data (UDP data), but video and large capacity data (FTP) When transmitting a data stream (broadband stream), since the Internet 212 is used, the communication cost of using the NGN network can be kept low.

  Next, another communication example of the communication system 100 shown in FIG. 1 will be described with reference to the sequence diagram of FIG. Here, the communication terminal device 110A is described as “terminal A”, and the communication terminal device 110B is described as “terminal B”.

  (1) Terminal A transmits to the NGN network 211 an INVITE message in which the dialed telephone number is set as the destination, the IP address, the media type of voice and data, and the port number are set as SDP (see FIG. 5). .

  (2) The NGN network 211 extracts the IP address of the terminal B from the destination (telephone number) of the INVITE message, and transmits the INVITE message to the terminal B.

  (3) Terminal B sets the IP address, voice and data media type, and port number of terminal A included in the received INVITE message in the telephone number corresponding area of terminal A in the telephone number corresponding stream control data (see FIG. 4). Remember.

  (4) As a response to the INVITE message, the terminal B transmits 200 OK in which its own IP address, voice and data media type, and port number are set to SDP (see FIG. 5) to the NGN network 211.

  (5) The NGN network 211 transfers the 200 OK to the terminal A from the session information in the 200 OK message received from the terminal B by a known technique.

  (6) The terminal A sets the IP address, voice and data media type, and port number of the terminal B included in the received 200 OK to the telephone number corresponding area of the terminal B of the telephone number corresponding stream control data (see FIG. 4). Remember.

  (7) Here, a session is established between the terminal A and the terminal B via the NGN network 211. Then, the terminal A and the terminal B are in voice communication via the NGN network 211. That is, a stream (audio stream) capable of transmitting and receiving an audio signal via the NGN network 211 is established between the terminal A and the terminal B. In addition, a stream (data stream) capable of transmitting and receiving data via the NGN network 211 is established between the terminal A and the terminal B.

  (8) The terminal A refers to the telephone number-corresponding stream control data corresponding to the telephone number of the terminal B, and extracts the IP address of the terminal B, the media type of data transfer, and the port number. Then, a UDP packet in which the media type necessary for video communication and file transfer and the port number are set to SDP is transmitted to the terminal B via the NGN network 211.

  (9) The terminal B uses the media type and port number of the video communication and file transfer of the terminal A included in the received UDP packet (SDP), the port number as the telephone number corresponding area of the terminal A of the telephone number corresponding stream control data (see FIG. 4) ).

  (10) The terminal B refers to the telephone number corresponding stream control data corresponding to the telephone number of the terminal A, extracts the IP address of the terminal A, the media type of data transfer, and the port number. Then, a UDP packet in which the media type necessary for video communication and file transfer and the port number are set to SDP is transmitted to the terminal A via the NGN network 211.

(11) The terminal A sets the media type and port number of the video communication and file transfer of the terminal B included in the received UDP packet (SDP) and the port number in the telephone number corresponding area of the terminal B of the telephone number corresponding stream control data (see FIG. 4 ).

  (12) The terminal A transmits a BYE message to the NGN network 211. Then, the NGN network 211 transmits a BYE message to the terminal B. Here, the session via the NGN network 211 is disconnected.

  (13) The terminal A refers to the telephone number corresponding stream control data (see FIG. 4) corresponding to the telephone number of the terminal B, and the IP address of the terminal B (the IP address here is the IP address of the second network communication unit) And the media type and port number of the data transfer are extracted, an INVITE message is transmitted to the terminal B via the Internet 212.

  (14) When the terminal B receives the INVITE message via the Internet 212, the terminal B refers to the telephone number corresponding stream control data corresponding to the telephone number of the terminal A (see FIG. 4), and the IP address of the terminal A (the IP address here) Is the IP address of the second network communication unit), and when the media type and port number for data transfer are extracted, 200 OK is transmitted to the terminal A via the Internet 212.

  (15) Here, a session is established between the terminal A and the terminal B via the Internet 212. Then, the terminal A and the terminal B are in voice and video communication via the Internet 212. That is, a stream (audio stream, video stream) capable of transmitting / receiving an audio signal and a video signal via the Internet 212 is established between the terminal A and the terminal B. In addition, a stream (file transfer stream) capable of transferring a file via the Internet 212 is established between the terminal A and the terminal B.

  In the communication example shown in the sequence diagram of FIG. 7 above, after the terminal A and terminal B have acquired connection information such as an IP address necessary for establishing a session via the Internet 212, a session via the NGN network 211 is obtained. Is disconnected and a session via the Internet 212 is established instead. In this case, since the Internet 212 is used for transmission of media streams of all media types, the communication cost for using the NGN network can be further reduced.

  In the communication example shown in the sequence diagram of FIG. 3 described above, after the terminal device A dials the telephone number of the terminal device B, a session via the NGN network 211 is established, and an audio stream and a data stream are established. After that, for example, when a media stream such as a video signal or fill data is transmitted to the terminal B, a session via the Internet 212 is further established while a session via the NGN network 211 is established. This is an example. In this example, the terminal device A transmits a media stream such as a video signal or fill data to the terminal B via the Internet 212 while performing voice communication with the terminal B via the NGN network 211, for example. Can do.

  Further, in the communication example shown in the sequence diagram of FIG. 7 described above, after the terminal device A dials the telephone number of the terminal device B, a session via the NGN network 211 is established, and an audio stream and a data stream are established. After that, the session via the NGN network 211 is disconnected and the session via the Internet 212 is established. In this example, the terminal device A transmits a media stream such as a video signal or fill data to the terminal B via the Internet 212 while performing voice communication with the terminal B via the Internet 212, for example. can do.

  In the terminal device A, when a predetermined media stream is transmitted to the terminal B, it is determined whether the media stream is transmitted through the NGN network 211 or the Internet 212 and communication processing is performed. Good.

  In this case, the control unit 111 of the terminal device A determines whether the predetermined media stream to be transmitted is transmitted through the NGN network 211 or the Internet 212, the media type of the media stream, the band, and the other party's telephone number. Etc. can be determined.

  For example, when the determination is made based on the media type of the media stream, the audio signal or the small capacity data (UDP data) is determined to be transmitted through the NGN network 211, and the video signal or the large capacity data (FTP data) is determined. Is determined to transmit over the Internet 212. In this case, for each media type, information on whether the media stream is transmitted through the NGN network 211 or the Internet 212 may be prepared in the terminal device A in advance, but can be arbitrarily set by the user. May be.

  Also, for example, when determining based on the bandwidth of the media stream, when the bandwidth of the media stream is equal to or less than the threshold, it is determined to transmit by the NGN network 211, and when the bandwidth of the media stream exceeds the threshold, the Internet A decision is made to transmit at 212. In this case, the bandwidth threshold may be prepared in advance in the terminal device A, but may be arbitrarily set by the user.

  Also, for example, when determining based on the other party's telephone number, if it is the telephone number of an important business partner that requires QoS guarantee, it is determined to be transmitted through the NGN network 211, and other telephone numbers are used. In some cases, it is decided to transmit on the Internet 212. In this case, for each telephone number, information on whether the media stream is transmitted through the NGN network 211 or the Internet 212 may be prepared in advance in the terminal device A, but can be arbitrarily set by the user. May be.

  FIG. 8 shows an example of a setting screen displayed on the display of the terminal A. Using this setting screen, the user can perform settings by operating a keyboard, a mouse, and the like. The user can set whether to transmit the media stream by the NGN network 211 or the Internet 212 for each media type on the setting screen of FIG. In this case, the user inputs the media type and the corresponding NW type in the input frame. Here, the NW type is NGN or the Internet.

  Further, the user can set whether to transmit the media stream via the NGN network 211 or the Internet 212 for each telephone number on the setting screen of FIG. In this case, the user inputs a telephone number and a corresponding NW type in the input frame. In the setting screen example of FIG. 8, only one input frame is provided, but a plurality of input frames may be provided as in the media type.

  Further, the user can set the bandwidth threshold on the setting screen of FIG. In this case, the user inputs a bandwidth threshold value in the input frame.

  Information (media transmission information) set by the user using the setting screen as described above is held in, for example, a nonvolatile memory of the information storage unit 115. FIG. 9 shows a configuration example of the media transmission information.

  As described above, the control unit 111 of the terminal device A determines whether the predetermined media stream to be transmitted is transmitted through the NGN network 211 or the Internet 212, the media type of the media stream, the band, and the other party. It is determined based on the telephone number on the side, but which information is used or which information is preferentially used may be set in advance or set by the user.

  For example, priority is given to the correspondence between the other party's telephone number and the NW type, and when the other party's telephone number is not set, the process proceeds to a determination process based on the media type or band.

  Note that when the terminal device A determines to transmit a predetermined media stream to the terminal B through the NGN network 211, a session via the NGN network 211 is established between the terminal A and the terminal B. In this case, the terminal device A transmits media information such as a media type and a port number to the terminal device B by setting the SDP of the INVITE message, and the terminal device B sets the media information to the SDP of 200 OK. Transmit to terminal device A.

  Further, when the terminal device B decides to transmit a predetermined media stream to the terminal B via the Internet 212, a session via the NGN network 211 is established between the terminal A and the terminal B, and thereafter The session via the NGN network 211 is disconnected, and a session via the Internet 212 is established between the terminal A and the terminal B. In that case, the terminal device A sets the media information such as the media type and port number in the SDP of the UDP packet on the data stream after the session via the NGN network 211 is established, and transmits it. Transmits the media information to the terminal device A by setting the media information as the SDP of the UDP packet on the data stream.

  In the communication system 100 shown in FIG. 1, the communication terminal device (terminal A) 110A uses connection information such as an IP address and a port number sent from the communication terminal device (terminal B) 110B via the NGN network 211. Therefore, since the session via the Internet 212 can be established, the media stream is favorably transmitted to the communication terminal apparatus (terminal B) 110B using either the NGN network 211, the Internet network 212, or both. be able to.

  Further, in the communication system 100 shown in FIG. 1, if the communication terminal device (terminal A) 110A knows the telephone number of the communication terminal device (110B), the communication terminal device (terminal A) 110B) can establish a session via the NGN network 211, and during and after the session establishment, the IP address of the communication terminal device (terminal B) 110B (the IP address here is the second network) Since the port number information can be acquired, a session via the Internet 211 can be established with the communication terminal device (terminal B). In other words, in the communication system 100 shown in FIG. 1, the communication terminal device (terminal A) 110A does not know the IP address of the communication terminal device (110B), but knows only the telephone number. Communication via can be performed.

  In the embodiment described above, the first network is the NGN network 211 and the second network is the Internet 212. However, in the present invention, the first network and the second network are the same. It is not limited to. For example, the second network may be an intranet instead of the Internet.

  The present invention can satisfactorily transmit a media stream to a counterpart terminal device, and can be applied to, for example, a communication system in which an NGN network and the Internet are interposed between communication terminals.

It is a block diagram which shows the structural example of the communication system as embodiment of this invention. It is a block diagram which shows the structural example of a communication terminal device. It is a sequence diagram for demonstrating the example of communication of a communication system. It is a figure which shows the structural example of the telephone number corresponding | compatible stream control data. It is a figure which shows the example of description of SDP set to INVITE message or 200 OK. It is a figure which shows the example of description of SDP set to a UDP packet (data stream). It is a sequence diagram for demonstrating the other communication example of a communication system. It is a figure which shows an example of the setting screen of the media transmission information displayed on a display. It is a figure which shows the structural example of media transmission information.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Communication system, 110, 110A, 110B ... Communication terminal device, 111 ... Control part, 112 ... Input part, 113 ... Output part, 114 ... Information input part, 115. ..Information storage unit 116 ... Information processing unit 117 ... Network communication unit 211 ... Next generation network (NGN) network 212 ... Internet

Claims (12)

A first network communication unit that communicates with a counterpart communication terminal device through a first network;
A second network communication unit for communicating with the counterpart communication terminal device through a second network;
A control unit that controls operations of the first network communication unit and the second network communication unit;
The control unit establishes a session via the second network by the second network communication unit based on connection information sent from the counterpart communication terminal device via the first network. A communication terminal device. The control unit establishes a session via the second network by the second communication unit in a state where a session via the first network is established. The communication terminal device described. 2. The control unit according to claim 1, wherein the control unit establishes a session via the second network by the second network communication unit after disconnecting the session via the first network. Communication terminal device. The communication terminal apparatus according to claim 1, wherein the first network is a guarantee type network, and the second network is a best effort type network. The communication terminal apparatus according to claim 4, wherein the guarantee type network is a next generation network (NGN) network, and the best effort type network is the Internet or an intranet. When transmitting the predetermined media stream, the control unit determines whether to transmit the media stream through the first network or the second network according to the media type of the predetermined media stream. The communication terminal device according to claim 1, wherein the communication terminal device is determined. A user setting unit for setting whether a user transmits a media stream in the first network or the second network for each media type;
The control unit determines whether to transmit the predetermined media stream on the first network or the second network based on setting information set by the user setting unit. The communication terminal device according to claim 6. The control unit determines whether to transmit the media stream on the first network or the second network according to the band of the predetermined media stream when transmitting the predetermined media stream. The communication terminal device according to claim 1, wherein: A user setting unit configured to set a bandwidth threshold for the user to determine whether the media stream is transmitted through the first network or the second network;
The control unit determines whether to transmit the predetermined media stream through the first network or the second network based on the bandwidth threshold information set by the user setting unit. The communication terminal device according to claim 8. When transmitting a predetermined media stream, the control unit determines whether to transmit the media stream through the first network or the second network according to the telephone number of the other party. The communication terminal device according to claim 1. A user setting unit for setting whether the user transmits a media stream on the first network or the second network for each telephone number on the other side;
The control unit determines whether to transmit the predetermined media stream on the first network or the second network based on setting information set by the user setting unit. The communication terminal device according to claim 10. A first network communication unit that communicates with the counterpart communication terminal device through the first network, and a second network communication unit that communicates with the counterpart communication terminal device through the second network; A communication terminal device control method comprising:
A first session establishing step of establishing a session via the first network by the first network communication unit;
A connection information acquisition step of acquiring connection information sent from the counterpart communication terminal device via the first network;
And a second session establishment step of establishing a session via the second network by the second network communication unit based on the connection information.

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