CN103795878B - A kind of guard method of Voice over IP business, equipment and system - Google Patents

Abstract

The present invention provides a protection method, equipment and system for voice services carried over IP, which are applied in the technical field of communication. The protection method includes: the backup call control device receives and stores the registration information of the call access device in the protection group, and takes over the call access device according to the registration information when the active call control device in the protection group fails Voice over IP services. The protection method disclosed by the present invention does not need to re-register the call access device during the protection switching process, and can seamlessly take over the VOIP service of the call access device after switching without causing call interruption, thus simplifying the implementation of VoIP service protection The complexity and call quality are also guaranteed, which improves the user experience.

Description

Protection method, device and system for IP bearer voice service

technical field

The present invention relates to the technical field of optical communication, in particular to a protection method, device and system for voice services carried over IP.

Background technique

With the continuous development of IP networks, the use of Voice over Internet Protocol (VoIP) is becoming more and more common. The VoIP network includes call control equipment and call access equipment. In order to ensure the stability and reliability of services, a backup call control equipment is also configured to carry services when the main call control equipment fails. Call access equipment needs to monitor the operating status of the active call control equipment at any time. When the active call control equipment is found to be unavailable, it must be reconnected to the standby call control equipment to ensure the normal operation of subsequent services.

However, the active-standby switchover of the call control device is mainly initiated and completed by the call access device, which requires the call access device to be configured with multiple device addresses of the call control device, and the call access device needs to automatically monitor the address of the active call control device. running status and perform corresponding active/standby switchover as required. Configuring the active-standby switching function on the call access device will increase the cost of the call access device. In fact, many call access devices on the market do not support these functions. When the active call control device connected to the call access device without the active/standby switchover function fails, the communication link will not be able to implement the active/standby switchover, resulting in service interruption.

Contents of the invention

In order to solve the problem that the existing IP voice bearer service protection method has high requirements for call access equipment configuration and poor protection effect, the embodiment of the present invention provides a protection method, device and system for IP voice bearer service, specifically :

According to the first aspect of the embodiments of the present invention, a method for protecting a voice over IP service is provided, which is applied in a protection group for a voice over IP service, and the protection group includes at least a first call control device and a second call control device connected to each other. device, all the call control devices in the protection group are connected to the call access device, and the IP bearer voice service is the IP bearer voice service of the call access device, and the protection method includes: as an IP bearer voice service in the protection group The second call control device of the standby device receives a message from the first call control device serving as the active device in the protection group, and obtains the registration of the call access device in the protection group carried in the message information; the second call control device monitors the state of the first call control device, and when it detects that the first call control device fails, the second call control device uses the IP address of the protection group as An IP address of itself, sends a free address resolution protocol message carrying the MAC address of the protection group to the call access device, and changes from the standby state to the active state; The call access device or a call request directed to the call access device, and process the voice over IP service according to the call request and the registration information.

In a first possible implementation manner of the first aspect, after the second call control device changes from the standby state to the active state, process the current call access device's current status according to the registration information and call session information. The IP bearer voice service, the call dialogue information is the current IP bearer voice service call dialogue information of the call access device sent by the first call control device before it fails.

In a second possible implementation manner of the first aspect, the registration information includes: an identifier and/or an authentication challenge code of the call access device.

According to the second aspect of the embodiments of the present invention, there is provided a call control device, the call control device includes: a receiving module, configured to receive a message; a storage module, configured to store the information carried in the message received by the receiving module First registration information, the first registration information is the registration information of the first call access device connected to the call control device in the protection group, and the protection group is the protection group where the call control device is located; processing A module for judging whether the call control device needs to change from the standby state to the active state, and if so, use the IP address of the protection group as an IP address of the call control device to send the call control device to the first call control device. The ingress device sends a free address resolution protocol message that carries the MAC address of the protection group, and sets the call control device to an active state; obtains a call from the call access device or directed to the call access device request, and process the IP bearer voice service of the call access device according to the call request and the first registration information; the processing module is connected to the receiving module and the storage module.

In the first possible implementation of the second aspect, the processing module is further configured to determine whether the call control device needs to change from the active state to the non-active state, and if so, stop processing the voice service over IP .

In a second possible implementation manner of the second aspect, the storage module is further configured to store the call dialogue information carried in the message received by the receiving module, and the call dialogue information is the call access The current call dialogue information of the IP bearer voice service of the device; the processing module is further configured to, after setting the call control device to the active state, according to the first registration information from the storage module and the The call session information processes the current IP bearer voice service.

In a third possible implementation manner of the second aspect, the processing module is further configured to, when the call control device is in the active state, The registration request message generates the second registration information of the second call access device on the protection group, processes the IP bearer voice service of the second call access device according to the second registration information, and generates a port There is a notification message of the second registration information; the storage module is also used to store the second registration information; the call control device also includes a sending module, which is also used to send other call control messages in the protection group The device sends the notification message.

According to the third aspect of the embodiment of the present invention, there is also provided a voice over IP system, the system includes a protection group connected to each other and a call access device; the protection group includes at least the first A call control device and a second call control device as a backup device; the first call control device is configured to generate registration information according to a registration request from the call access device, and after successful registration according to the registration information from the call access device Incoming device or a call request directed to the call access device, and the registration information processes the IP bearer voice service of the call access device; generates a first message carrying the registration message, and sends it to the protection group Send the first message by other call control devices; send the second message for announcing its working status at regular intervals during its function as the active device, and/or send it when it changes from the active state to the non-active state The third message; the second call control device is configured to receive the first message and store the registration information carried in the first message; monitor according to the second message and/or the third message The state of the first call control device, when detecting that the first call control device fails, uses the IP address of the protection group as one of its own IP addresses, and sends to the call access device carrying the The free address resolution protocol message of the MAC address of the protection group, and changes from the standby state to the active state; obtain the call request from the call access device or point to the call access device, according to the call request and the call request The registration information processes the IP bearer voice service.

In a first possible implementation manner of the third aspect, the second call control device is further configured to take over the call access device according to the registration information and call session information after it becomes active The current IP bearer voice service, the call dialogue information is the current IP bearer voice service call dialogue information of the call access device sent by the first call control device before it fails.

According to the method, device and system for protecting the VoIP service of the call access device disclosed in the first, second and third aspects of the embodiment of the present invention, during the protection switching process, the call access device does not need to re-register, and the active call after switching The control device can seamlessly take over the VOIP service without causing call interruption, so the complexity of implementing VoIP service protection is simplified, the call quality is also guaranteed, and the user experience is improved. At the same time, there is no need for the call access device to perform anomaly detection on the call control device and the corresponding active/standby switchover, nor is it necessary for the call access device to configure two uplink addresses, which reduces the configuration requirements of the call access device, thereby reducing the call access cost of input equipment.

Description of drawings

In order to illustrate the present invention and related embodiments more clearly, the following drawings are provided:

FIG. 1 is a flowchart of a method for protecting a call access device IP bearer voice service in Embodiment 1 of the present invention;

FIG. 2 is a signaling interaction diagram of a registration process of a call access device and a call process in the prior art;

FIG. 3 is a structural diagram of a call control device provided in Embodiment 2 of the present invention;

FIG. 4 is a structural diagram of a network device provided in Embodiment 3 of the present invention;

FIG. 5 is a system internal signaling interaction diagram provided in Embodiment 4 of the present invention;

FIG. 6 is a signaling interaction diagram of a protection mechanism for a voice over IP service in the prior art.

specific embodiment

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

Embodiment 1: The embodiment of the present invention provides a method for protecting a Voice over IP (VOIP) service of a call access device, as shown in FIG. 1 .

The protection method can be applied in a protection group, the protection group includes at least a first call control device and a second call control device connected to each other, and all call control devices in the protection group are connected to the call access device. A protection group is also called a backup group, and it consists of an active call control device and a backup call control device, or it can also consist of an active call control device and multiple backup call control devices. The protection group can be connected to the call access device through the convergent switching device, at the same time, the protection group is connected to the network, and the call control devices in the protection group are connected to each other. Usually, multiple call access devices are connected under the protection group. In this embodiment, only the protection method of the VOIP service of one call access device is described, and the protection methods of other call access devices are the same. The call control device described in the embodiment of the present invention refers to a device with IP routing function and VOIP service management and control capabilities. According to different VOIP protocols in the voice call network, the call control device can be, for example, a session initiation protocol (SessionInitiationProtocol, SIP) core IP multimedia system (IPMultimediaSubsystem, IMS) with functions of registration server and call proxy server, core-side softswitch equipment with gatekeeper function in H.323 protocol, and media gateway controller (MediaGatewayController, MGC) A switching device with a media gateway control protocol (eg MGCP or Megaco/H.248) function and an access router (AccessRouter, AR) with a similar function. The call access device described in the embodiment of the present invention refers to a device with a call function that supports the corresponding VOIP protocol. According to the specific VOIP protocol devices in the voice call network, it can be, such as an IP phone, a VOIP Devices with access capabilities (such as IP group phones) or soft phones that support VOIP, gateway devices that support VOIP protocols, and so on. In the prior art, after the call access device is registered with the call control device, its call request will be processed by the call control device registered for it. Take the SIP protocol as an example (other VOIP protocols are similar). In the prior art, the specific registration process and the signaling diagram of the call process are shown in Figure 2. The call access device regularly monitors the operating status of the call control device. , you need to re-register with the standby call control device through the REGISTER and 200K signaling in the figure. In the embodiment of the present invention, the protection group replaces the call control device in FIG. 2 and realizes corresponding functions, and the service of the protection group is processed by the active call control device in the protection group through the IP routing protocol inside the protection group.

In the embodiment of the present invention, the first call control device and the second call control device or more call control devices can be configured through the command line provided by the call control device or the network management device, and these call control devices are configured into a protection group . The configuration method may be to use existing IP routing redundancy protocols, such as virtual routing redundancy protocols, hot backup routing protocols, and the like. The configured protection group has an IP address, which can be the IP address of a call control device in the protection group or other IP addresses, and has a virtual MAC address at the same time. For the call access device connected to this protection group, this protection group is equivalent to a virtual call control device, the IP address of the protection group is the IP address of the virtual call control device, and the virtual MAC address of the protection group is the virtual call control device. The MAC address of the call control device, so the address of the call control device configured uplink is the above IP address. Inside the protection group, messages or packets sent to this IP address are processed by the active call control device in the protection group, and the standby call control device is in the ready state, and does not process signaling from outside the protection group. When the protection group is enabled, each device broadcasts a message, and then a call control device with the highest configured priority value can be elected as the master through an election negotiation strategy, and the others are standby. Of course, other election negotiation strategies can also be used.

The method for protecting the VOIP service of the call access device in the embodiment of the present invention specifically includes:

Step 101, the second call control device as the standby device in the protection group receives a message from the first call control device as the active device in the protection group, and acquires the call connection information carried in the message. Enter the registration information of the device in the protection group. The active call control device in the protection group, that is, the first call control device, is responsible for processing the registration request sent by the call access device to the protection group and the call request after the registration is completed. If the call control device also enables the authentication function at the same time, it needs to be authenticated during registration to determine whether to provide services to the call access device applying for registration. The authentication process is a prior art and will not be described in detail . Each time the active call control device receives a new registration request, after completing the registration, it will send the registration information to all the standby call control devices in the protection group. Here, there is no restriction on the communication mode between the active and standby call control devices, and the implementation of the IP routing redundancy protocol can be extended, or the communication mode can be defined by oneself. Optionally, the registration information can be carried in the notification message sent by the active device, or you can define a communication method to send the above information. For example, the active device sends a VOICE_BACKUP message to the backup device based on the user datagram protocol, carrying the above content and An incremental sequence number, after the standby device receives it, saves all the content, and responds with a response VOICE_BACKUP_ACK based on the user datagram protocol, carrying the received sequence number, and notifies the primary device that the backup information has been received and saved; the primary device If the AR receives the VOICE_BACKUP_ACK corresponding to the sequence number, the interaction ends. Otherwise, the active AR retransmits the VOICE_BACKUP message periodically (for example, 4 seconds) until it receives VOICE_BACKUP_ACK or retransmits a certain number of times (for example, 3 times) before stopping. Regarding the content of the registration information, taking the SIP protocol as an example, part of the registration and response signaling for the interaction between the call access device and the call control device is as follows:

REGISTER sip: 10.71.44.35:5060SIP/2.0

Call-ID: 4c9197107b94fb5f76ab7b603e49abf510.71.44.33

From: <sip:scscf.huawei.com>; tag＝60846f68

To: <sip:28781217huawei.com>

Contact: <sip:scscf.huawei.com:5060; Dpt=2894-4>; expires=1200

Status-Line: SIP/2.0200OK

Call-ID: 4c9197107b94fb5f76ab7b603e49abf510.71.44.33

From: <sip:scscf.huawei.com>; tag＝60846f68

To: <sip:28781217huawei.com>; tag＝fe478ea1

Contact: <sip:scscf.huawei.com:5060; Dpt＝2894-4>; expires＝1200

It can be seen from the above signaling that the registration information generally includes, but is not limited to, the identification of the call access device that initiates the registration request (usually a telephone number, that is, the PublicID in the signaling), the contact address of the call access device ( Contact header field content in the signaling), registration session information (Call-ID, Fromtag, totag, etc. in the signaling), and information about whether the call access device is registered (registered or unregistered). The registration process of other VOIP protocols is similar to the registration process of the SIP protocol, and the contents of the registration information are also roughly the same. The registration information includes the contact address and the endpoint identity of the call access barium. Optionally, all the registration information may carry authentication information, specifically the authentication challenge code generated by the call control device during the authentication process of the call access device. All backup call control devices in the protection group, which are the second call control device in this embodiment, and of course other backup call control devices may also be included in the protection group, can receive the registration information and store the registration information. information.

Step 102, the second call control device monitors the state of the first call control device, and when it detects that the first call control device fails, the second call control device sends the IP address of the protection group to As an IP address of itself, send a free address resolution protocol message carrying the MAC address of the protection group to the call access device, and change from the standby state to the active state; the second call control device obtains from The call access device or the call request directed to the call access device processes the IP bearer voice service according to the call request and the registration information. When the active call control device in the protection group, that is, the first call control device is working normally, it sends a notification message at regular intervals to inform the backup call control device in the protection group that it is working normally, and the backup call control device After receiving the notification message, it is known that the active device is normal, and then continues to maintain the standby state. The certain time interval is optional when the protection group is configured, such as 1 second, or 0.01 second and so on. If the standby call control device does not receive the notification message within several consecutive time intervals, for example, if it does not receive the notification message within 3 consecutive time intervals, it is considered that the active call control device is faulty. Alternatively, the active device may send a special message when exiting the active state, such as a notification message with a priority of zero, to inform the standby device in the protection group that it has exited the active state. When the notification message that the active device is working normally is not received within the set time interval or the notification message that the active device exits the active state is received, the standby call control device, in this embodiment, is the second call control device The device becomes the new active call control device. Specifically, if there is only one standby call control device in the protection group, the standby call control device changes from the standby state to the active state, and regularly sends notification messages to the outside. If there are two or more standby call control devices in the protection group, these standby call control devices elect a new active call control device through the election negotiation strategy of the IP routing protocol. Optionally, the election negotiation strategy may be: when the current active call control device in the protection group fails, the standby call control device with the highest priority value configured according to the IP routing redundancy protocol becomes the new active call control device. or, when the current active call control device in the protection group fails, the standby call control device with the largest IP address becomes the new active call control device. The second call control device uses the IP address of the protection group as one of its own IP addresses, sends a free address resolution protocol message carrying the MAC address of the protection group to the call access device, and changes from the standby state to Primary state. Sending the free ARP message may be a broadcast, and the message carries the virtual MAC address of the protection group. Specifically, the message is sent with the virtual MAC address of the protection group as the source MAC address. The message will reach each call access device through the aggregation switch. For the call access device, the information carried in this message is not substantially different from the address resolution protocol entry stored before. For the aggregation switch, it can The forwarding port corresponding to the virtual MAC address is learned through the message, thereby updating the forwarding table, thereby ensuring that future messages directed to the virtual MAC can be successfully forwarded to the new active device. In this embodiment, after the second call control device becomes the active call control device, it takes over the call access device according to the previously received registration information of the call access device sent by the first call control device , specifically taking over the registration management of the call access device, and processing the VOIP service generated after the call access device is taken over according to the registration information. Specifically, after receiving a call request from or directed to the call access device, the second call control device processes the voice over IP service according to the call request and the registration information. Of course, after the second call control device becomes the active call control device, it also takes over the other call access devices connected to the protection group and handles their VOIP services at the same time. . Processing the VOIP service generated after the call access device is taken over mainly includes receiving the call request from the call access device, connecting it to a voice call or even a video call through signaling, and passing the call request through signaling to terminate the call request. Ordering it to end the call; of course, it also includes connecting it through signaling according to the call request directed to the call access device, and ending the call for it according to the end call request.

Optionally, after the second call control device changes from the standby state to the active state, it can also process the current VOIP service of the call access device according to the registration information and call session information, and the call session information It is the call dialogue information of the current VOIP service of the call access device sent before the failure of the first call control device. Call dialogue information refers to the dialogue information in the process of establishing a call connection, which can be used in the signaling to end the call, mainly including the identification and contact address of the two parties in the call, and the corresponding information generated according to each VOIP protocol, such as In SIP, it also includes call-id, fromtag and totag, etc. Of course, since the standby device has backed up part of the information when backing up the registration information, the main device can also choose to send only part of the call dialogue information, which has been registered in the registration information before. The content that has been sent in will not be sent. The first call control device, as the primary call control device, sends the call dialogue information of the current call, that is, the current VOIP service, to the standby Call control device. The sending method here is not limited, and may be an extended message of the IP routing protocol, or other communication methods. After the call of the call access device ends, a message is also sent to the standby call control device, instructing the standby call control device to clear the call session information. If when the first call control device breaks down, the call access device is still in the process of talking, then the second call control device takes over from the first call control device to become the active call control device and takes over all After calling the access device, process the current VOIP service of the call access device according to the registration information and call dialogue information. Since both the registration information and the call dialogue information have been stored in the second call control device, seamless takeover can be realized. The processing of the current VOIP service of the call access device here is mainly to end the current call for it according to the signaling according to the call end request. Generally speaking, only the signaling packets in the registration process, call connection establishment process and call end process need to pass through the call control device in the protection group, while the media messages in the call process do not need to pass through the call control device in the protection group. Therefore, when the protection group performs active-standby switchover, compared with the protection mechanism in the prior art that the call access device needs to interrupt the call first and then re-register, the call access device in this embodiment does not need to re-register, and the active call after switching The control device can directly take over the current call, so the call will not be interrupted.

In the method for protecting the VoIP service of the call access device disclosed in the embodiment of the present invention, during the protection switching process, the call access device does not need to re-register, and the switched active call control device can seamlessly take over the VOIP service without The call is interrupted, so the complexity of implementing VoIP service protection is simplified, the call quality is also guaranteed, and the user experience is improved. At the same time, the protection method does not require the call access device to perform abnormal detection on the call control device and corresponding active/standby switchover, nor does it require the call access device to configure two uplink addresses, which reduces the configuration requirements of the call access device, thereby Reduced cost of call access equipment.

Embodiment 2: The embodiment of the present invention provides a call control device, as shown in FIG. 3 . A receiving module, configured to receive messages; a storage module, configured to store first registration information carried in the messages received by the receiving module, where the first registration information is the first call interface connected to the call control device Enter the registration information of the device in the protection group, the protection group is the protection group where the call control device is located; the processing module is used to judge whether the call control device needs to change from the standby state to the active state, and if so, then Using the IP address of the protection group as an IP address of the call control device, sending a free address resolution protocol message carrying the MAC address of the protection group to the first call access device, and sending the call The control device is set to the active state; obtain a call request from or directed to the call access device, and process the IP bearer of the call access device according to the call request and the first registration information Voice service; the processing module is connected with the receiving module and the storage module.

Optionally, the processing module is further configured to determine whether the call control device needs to change from the active state to the non-active state, and if so, stop processing the voice service over IP. Optionally, the storage module is further configured to store the call session information carried in the message received by the receiving module, the call session information being the current call session of the voice over IP service of the call access device information; the processing module is further configured to process the current IP bearer according to the first registration information and the call session information from the storage module after setting the call control device to the active state voice business. Optionally, the processing module is further configured to generate the second call according to a registration request message from a second call access device connected to the call control device when the call control device is in an active state. the second registration information of the access device on the protection group, and process the IP bearer voice service of the second calling access device according to the second registration information, and generate a notification message carrying the second registration information The storage module is also used to store the second registration information; the call control device further includes a sending module, which is used to send the notification message to other call control devices in the protection group. Further, the method for judging whether the call control device needs to change from the standby state to the active state may specifically be: when the current active call control device in the protection group fails, according to the IP routing The backup call control device with the largest priority value configured in the redundancy protocol becomes the new active call control device; or, when the current active call control device in the protection group fails, the backup call control device with the largest IP address value The control device becomes the new active call control device.

Specifically, the storage module is used to store the first registration information received by the receiving module. The first registration information generally includes but is not limited to, taking the SIP protocol as an example, the identification of the call access device (usually a phone number) that initiates the registration request , which is the PublicID in the signaling), the contact address of the call access device (Contact header field content in the signaling), registration session information (Call-ID, Fromtag, totag, etc. in the Enter information about whether the device is registered (registered or not). The registration process of other VOIP protocols is similar to the registration process of the SIP protocol, and the contents of the registration information are also roughly the same. The registration information includes an endpoint identity. Optionally, all the registration information may carry authentication information, specifically the authentication challenge code generated by the call control device during the authentication process of the call access device. A protection group is a protection mechanism for protecting VoIP services in a VOIP networking, and its specific composition and connection relationship are the same as those of the protection group in Embodiment 1, and will not be described in detail. The processing module, the method for judging whether the call control device needs to change from the standby state to the active state may specifically be that the active call control device in the protection group will send a notification message at regular intervals to inform the protection The other devices in the group work normally. If the standby call control device in the protection group does not receive the notification message within the specified number of time intervals, it will select a new master through the election negotiation strategy according to the corresponding protocol. Control the device with calls. Alternatively, the backup device may consider that the active device has exited the active state according to the notification message with a priority of zero sent by the active device in the protection group received by the receiving module, and then judge whether it needs From standby to active. If there is only one backup device, the second call control device, it can directly become the active device. When the processing module finds that the call control device needs to change from the standby state to the active state, the IP address of the protection group is used as an IP address of the call control device to access the first call The device sends a gratuitous ARP message carrying the MAC address of the protection group, and sets the call control device in an active state. Specifically, the gratuitous address resolution protocol message carries the virtual MAC address of the protection group, and specifically the message is sent using the virtual MAC address of the protection group as the source MAC address. This message enables the aggregation switch used to connect the protection group and each call access device to update its forwarding table through this message, so as to ensure that subsequent messages can be correctly forwarded to the new active device of the protection group. At the same time, taking over the first call access device according to the first registration information, specifically managing the registration management of the first call access device, acquiring calls from or directed to the call access device request, and process the voice over IP service generated after the first call access device is taken over according to the first registration information. Optionally, after becoming the active device, the processing module needs to periodically generate the first notification message, which is used to inform other call control devices that it is working normally. There are no other backup devices, and the notification message may not be sent. Optionally, the processing module is also used to determine whether the call control device needs to change from the active state to the non-active state, and if so, stop processing the voice service over IP. The non-active state is a state other than the active state, and may include a standby state, an initialization state, or may include a standby state, an initialization state, and a dialogue state according to different routing redundancy protocols. Optionally, after the call control device takes over the first call access device, if it finds that the first call access device is in a call, that is, there is a current IP bearer voice service, then according to the stored The first registration information and the call dialogue information of the module process the current IP bearer voice service of the first call access device. Taking the SIP protocol as an example (other protocols are similar), the call dialogue information mainly includes but is not limited to: the ID of the caller (usually a phone number, that is, the PublicID in the signaling), the contact address of the caller, and the Call- ID and Fromtag, totag, etc. After the call control device takes over the first call access device, if it finds not only the first registration information of the first call access device but also the call session information of the first call access device, It means that the first call access device is in a call, and the call is terminated by signaling after the call ends. Generally speaking, only the signaling packets in the registration process, call connection establishment process and call end process need to pass through the call control device in the protection group, while the media messages in the call process do not need to pass through the call control device in the protection group. Therefore, when the protection group performs active-standby switchover, compared with the protection mechanism in the prior art that the call access device needs to interrupt the call first and then re-register, the call access device in this embodiment does not need to re-register, and the active call after switching The control device can directly take over the current call, so the call will not be interrupted. Optionally, the processing module can also be used to register a newly added second call access device according to its registration request message when it is in the active state, generate second registration information, and process the IP bearer generated after its registration. voice business. Generate a notification message carrying the second registration information, and send it to other call control devices in the protection group by the sending module, so as to perform protection switching when the call control device fails.

The call control device described in the embodiment of the present invention, according to different VOIP protocols in the voice call network, the call control device can be, for example, a core IP multimedia with Session Initiation Protocol (SessionInitiationProtocol, SIP) registration server and call proxy server functions System (IPMultimediaSubsystem, IMS), core-side softswitch device with gatekeeper function in H.323 protocol, media gateway controller (MediaGatewayController, MGC) side media gateway control protocol (such as MGCP or Megaco/H.248) function Switching equipment and access routers (AccessRouter, AR) with similar functions.

In the call control device disclosed in the embodiment of the present invention, during the protection switching process, the call access device connected to it does not need to re-register, and can seamlessly take over the VOIP service of the call access device after switching without causing call interruption. Therefore, the complexity of implementing VoIP service protection is simplified, the call quality is also guaranteed, and user experience is improved. At the same time, the call control device does not require the call access device to perform abnormal detection and corresponding active/standby switchover, nor does it need the call access device to configure two uplink addresses, which reduces the configuration requirements of the call access device, thereby reducing cost of call access equipment.

Embodiment 3: The embodiment of the present invention also provides a network device, as shown in FIG. 4 , including a processor, a memory, and a transceiver, wherein the processor is coupled to the latter two. The network device can be used to execute the method in the first embodiment. Specifically, the transceiver is used to receive messages from the outside of the network device and send messages to the outside, and the function of the transceiver can also be replaced by a receiver and a transmitter, wherein the receiver is used to receive messages, and the transmitter is used to The message is sent; the memory is used to store information; the processor is used to process the received message, specifically, it has the function of the processing module in the second embodiment.

The processor can be a general-purpose processor, such as an integrated circuit IC, and the program executed by it is stored in the memory; the processor can also be an application-specific integrated circuit, such as ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable gate array), or other functional devices.

In the network device disclosed in the embodiment of the present invention, during the protection switching process, the connected call access device does not need to re-register, and can seamlessly take over the VOIP service of the call access device after switching without causing call interruption, so The complexity of implementing VoIP service protection is simplified, the call quality is also guaranteed, and user experience is improved. At the same time, the call control device does not require the call access device to perform abnormal detection and corresponding active/standby switchover, nor does it need the call access device to configure two uplink addresses, which reduces the configuration requirements of the call access device, thereby reducing cost of call access equipment.

Embodiment 4: The embodiment of the present invention provides a voice over IP system.

The system includes a protection group and a call access device connected to each other; the protection group at least includes a first call control device as an active device and a second call control device as a backup device connected to each other; the first call The control device is configured to generate registration information according to the registration request from the call access device, and after the registration is successful, according to the call request from the call access device or directed to the call access device, and the registration information processing The IP bearer voice service of the call access device; generate the first message carrying the registration message, and send the first message to other call control devices in the protection group; sending a second message for announcing its working status, and/or sending a third message when it changes from the active state to the non-active state; the second call control device is configured to receive the first message and storing the registration information carried in the first message; monitoring the state of the first call control device according to the second message and/or the third message, when detecting that the first call control device When a failure occurs, use the IP address of the protection group as one of its own IP addresses, send a free address resolution protocol message carrying the MAC address of the protection group to the call access device, and change from the standby state to the main Use status; acquire a call request from or directed to the call access device, and process the IP bearer voice service according to the call request and the registration information.

Optionally, the second call control device is further configured to take over the current IP bearer voice service of the call access device according to the registration information and call dialog information after it becomes active, and the call The dialog information is the current call dialog information of the voice over IP service of the call access device sent by the first call control device before it fails.

In short, the protection group in this embodiment is composed of multiple call control devices disclosed in Embodiment 2 according to the IP routing redundancy protocol. According to the protection method disclosed in Embodiment 1, the call access devices under the protection group IP bearer voice service is protected. Taking the SIP protocol as an example, the specific signaling interaction diagram in this system is shown in Figure 5. In the figure, the protection group with only two call control devices is taken as an example. In fact, the protection group can It includes more than two call control devices, including one main device and multiple backup devices. For the specific details of the devices in the protection group, refer to the second embodiment. For the method for implementing the protection of the voice service over IP in the protection group, refer to the first embodiment, which will not be described in detail.

In the protection mechanism of the prior art SIP protocol in Fig. 6, the call access device needs to periodically send OPTIONS messages to monitor the active and standby status. Re-initiate registration. Compared with the prior art, in the system of the embodiment of the present invention, the downlink call access device only needs to register once, and when the active device in the protection group fails, the call access device does not need to register again, and the protection group internally Active/standby switchover, the call access device may not even be aware of it. At the same time, by backing up the current call of the call access device, it can ensure that the call access device does not interrupt the call when the active/standby switchover of the protection group occurs.

In the protection group of the VoIP service disclosed in the embodiment of the present invention, during the protection switching process, the call access device does not need to re-register, and the switched active call control device can seamlessly take over the VoIP service without causing call interruption, so The complexity of implementing VoIP service protection is simplified, the call quality is also guaranteed, and user experience is improved. At the same time, the protection group does not require the call access device to perform abnormal detection on the call control device and corresponding active/standby switchover, nor does it require the call access device to configure two uplink addresses, which reduces the configuration requirements of the call access device, thereby Reduced cost of call access equipment.

Through the above description of the implementation manners, those skilled in the art can clearly understand that the present invention can be implemented by hardware, firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example but not limitation: computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or may be used to carry or store information in the form of instructions or data structures desired program code and any other medium that can be accessed by a computer. also. Any connection can suitably be a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixation of the respective media. As used herein, Disk and disc include compact disc (CD), laser disc, compact disc, digital versatile disc (DVD), floppy disc, and Blu-ray disc, where discs usually reproduce data magnetically, and discs Lasers are used to optically reproduce the data. Combinations of the above should also be included within the scope of computer-readable media.

In a word, the above descriptions are only preferred embodiments of the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. the guard method of a Voice over IP business; be applied in Voice over IP service protection group; described protection group at least comprises interconnective first call control device and the second call control device; all-calls control appliance in described protection group connects calling access device; described Voice over IP business is the Voice over IP business of described calling access device; it is characterized in that, described guard method comprises:

The second call control device as the stand-by equipment in described protection group receives the message from the first call control device as host apparatus in described protection group, obtains the log-on message of described calling access device in described protection group carried in described message;

The state of described first call control device of described second call control device monitoring, when detecting that described first call control device breaks down, described second call control device is using the IP address of the IP address of described protection group as self, send the free address resolution protocol message carrying the MAC Address of described protection group to described calling access device, and become master state from stand-by state;

Described second call control device obtains from described calling access device or the call request pointing to described calling access device, Voice over IP business according to described call request and described log-on message process.

2. guard method according to claim 1, is characterized in that, described guard method also comprises:

When described second call control device becomes after master state from stand-by state, the Voice over IP business that access device is current is called out, the call conversation information of the Voice over IP business that the described calling access device that described call conversation information sends before it breaks down for described first call control device is current according to described log-on message and call conversation information processing.

3. guard method according to claim 1 or 2, is characterized in that, described log-on message comprises: the mark of described calling access device and/or authentication challenge code.

4. a call control device, is characterized in that, described call control device comprises:

Receiver module, for receipt message;

Memory module, for storing the first log-on message carried in the message received by described receiver module, described first log-on message be connected with described call control device first call out the log-on message of access device in protection group, described protection group is the protection group at described call control device place;

Processing module, for judging that described call control device becomes master state the need of from stand-by state, if, then using the IP address of the IP address of described protection group as described call control device, send to described first calling access device the free address resolution protocol message carrying the MAC Address of described protection group, and described call control device is set to master state; Obtain from described calling access device or the call request pointing to described calling access device, according to described call request and described first log-on message process, call out the Voice over IP business of access device;

Described processing module is connected with described receiver module and described memory module.

5. call control device according to claim 4, is characterized in that:

Described processing module, also for judging that described call control device becomes non-active status the need of from master state, if so, then stops process IP carry voice traffic.

6. call control device according to claim 4 or 5, is characterized in that:

Described memory module, also for storing the call conversation information of carrying in the message received by described receiver module, described call conversation information is the call conversation information of the current Voice over IP business of described calling access device;

Described processing module, also for after described call control device is set to master state, according to Voice over IP business current described in from described first log-on message of described memory module and described call conversation information processing.

7. call control device according to claim 6, is characterized in that:

Described processing module, also for when described call control device is in master state, generate described second according to the login request message of calling out access device from be connected with described call control device second and call out second log-on message of access device in described protection group, and according to described second log-on message process the Voice over IP business of the second calling access device, generate and carry the notice message of described second log-on message;

Described memory module, also for storing described second log-on message;

Described call control device also comprises sending module, also for sending described notice message to other call control devices in described protection group.

8. a Voice over IP system, is characterized in that:

Described system comprises interconnective protection group and calling access device;

Described protection group at least comprises interconnective the first call control device as host apparatus and the second call control device as stand-by equipment;

Described first call control device, for generating log-on message according to the registration request from described calling access device, after succeeding in registration, basis is from described calling access device or the call request pointing to this calling access device, and calls out the Voice over IP business of access device described in described log-on message process; Generate the first message carrying described log-on message, and send described first message to other call control devices in described protection group; During it is as host apparatus, timed sending is for noticing the second message of its operating state, and/or, send the 3rd message when it becomes non-active status from master state;

Described second call control device, for receiving described first message and storing the described log-on message carried in described first message; The state of described first call control device is monitored according to described second message and/or described 3rd message, when detecting that described first call control device breaks down, using the IP address of the IP address of described protection group as self, send the free address resolution protocol message carrying the MAC Address of described protection group to described calling access device, and become master state from stand-by state; Obtain from described calling access device or the call request pointing to described calling access device, Voice over IP business according to described call request and described log-on message process.

9. system according to claim 8, is characterized in that:

Described second call control device, also for after it becomes master state, the current Voice over IP business of described calling access device is taken over, the call conversation information of the Voice over IP business that the described calling access device that described call conversation information sends before it breaks down for described first call control device is current according to described log-on message and call conversation information.