WO2012155629A1

WO2012155629A1 - Network disaster recovery method and system

Info

Publication number: WO2012155629A1
Application number: PCT/CN2012/072342
Authority: WO
Inventors: 杨敏; 罗会平; 梅君君
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-21
Filing date: 2012-03-14
Publication date: 2012-11-22
Also published as: CN102891833B; CN102891833A

Abstract

A network disaster recovery method and a network disaster recovery system relate to the field of IP communications, and solve the problem of global network breakdown due to a failure occurring at a Session Initiation Protocol (SIP) distribution agent device. The method comprises: when failing to process a received service request, a first SIP distribution agent device transferring the service request to a second SIP distribution agent device, where the first SIP distribution agent device and the second SIP distribution agent device not only serve as backup apparatuses for each other but also work normally; and the second SIP distribution agent device processing the service request transferred by the first SIP distribution agent device. The technical solution provided in the present invention is applicable to an SIP network and implements a flexible and reliable backup mechanism.

Description

Network disaster recovery method and system

Technical field

The present invention relates to the field of IP communications, and more particularly to a network disaster tolerance method and system in a Next Generation Network (NGN) or IP Multimedia Subsystem (IMS) network environment.

Background technique

With the popularity of mobile communication networks, users have higher and higher requirements for the quality of service for mobile communications. After operators require network nodes to fail, the network can continue to provide services. At the same time, under the trend of increasing traffic volume, a single application server has limited processing performance, and it is urgent to expand the number of application servers to enhance the processing performance of the application server. The Session Initiation Protocol (SIP) distribution agent device shields the increase in the number of application servers. Within the network site, the performance bottleneck and capacity expansion of the application server are solved. However, the network disaster recovery problem has not been solved well. When the SIP distribution agent device fails, bottlenecks are likely to occur, even if there is a SIP distribution agent device. The active and standby dual-machines also require a certain switching time or the switching failure due to the failure of the dual-machine itself, resulting in a global network failure, which is not conducive to business development. Summary of the invention

The present invention provides a network disaster tolerance method and system, which solves the problem that the network distribution network device is globally paralyzed when a SIP distribution agent device fails.

A network disaster recovery method includes:

When the first SIP distribution agent device is unable to process the received service request, handing over the service request to the second SIP distribution agent device, the first SIP distribution agent device and the second SIP distribution agent device are working normally The rest are backup devices;

The second SIP distribution agent device processes the service request handed over by the first SIP distribution agent device.

Preferably, the plurality of application servers under the first SIP distribution proxy device and the second SIP The plurality of application servers under the distribution agent device are each a backup device.

Preferably, the service request is an incoming call request sent by the IP Multimedia System (IMS) network or a Next Generation Network (NGN) network to the first SIP distribution proxy device, where the first SIP distribution proxy device cannot process the receiving When the service request arrives, the service request is handed over to the second SIP distribution agent device:

When the first SIP distribution proxy device is abnormal, the first SIP distribution proxy device does not respond to the link detection request sent by the IMS network or the NGN network to the first SIP distribution proxy device to indicate the The IMS network or the NGN network sends an incoming call request to the second SIP distribution agent device responsive to the link detection request.

Preferably, the service request is an incoming call request sent by the IMS network or the NGN network to the first SIP distribution proxy device, and the first SIP distribution proxy device sends the service when the received service request cannot be processed. The request to hand over to the second SIP Distribution Agent device is:

When all application servers under the first SIP distribution agent device are abnormal, the incoming call request is switched to the second SIP distribution agent device by softswitch.

Preferably, the service request is an incoming call request sent by the IMS network or the NGN network to the first SIP distribution proxy device, where the service is not processed when the first SIP distribution proxy device cannot process the received service request. The request to hand over to the second SIP Distribution Agent device is:

And when the application server that processes the incoming call request is abnormal under the first SIP distribution proxy device, forwarding the incoming call request to a backup device of the application server under the second SIP server.

Preferably, the service request is an active outbound call sent by an application server under the first SIP distribution proxy device, and the service request is handed over when the first SIP distribution proxy device cannot process the received service request. To the second SIP distribution agent device is:

When the application server detects that the first SIP distribution agent device is abnormal, the application server sends an outgoing call request to the second SIP distribution agent device.

Preferably, the network disaster tolerance method further includes: the first SIP distribution proxy device detects a connection with a plurality of application servers under the second SIP distribution proxy device by using a link detection mechanism, and the second SIP distribution The proxy device detects a connection with a plurality of application servers under the first SIP distribution agent device through a link detection mechanism. The present invention also provides a network disaster tolerance system, including a first SIP distribution agent device and a second

a SIP distribution agent device, the first SIP distribution agent device and the second SIP distribution agent device are mutually backup devices in normal operation; the first SIP distribution agent device is configured to: fail to process the received service When requested, handing over the service request to the second SIP distribution agent device;

The second SIP distribution agent device is configured to: process the service request handed over by the first SIP distribution agent device. Preferably, the network disaster tolerance system further includes multiple application servers under the first SIP distribution proxy device and multiple application servers under the second SIP distribution proxy device, under the first SIP distribution proxy device. The plurality of application servers and the plurality of application servers under the second SIP distribution agent device are in a one-to-one correspondence with each other as a backup device.

Preferably, the first SIP distribution proxy device is configured to: when the first SIP distribution proxy device is abnormal, the first SIP distribution proxy device does not distribute the IMS network or the NGN network to the first SIP The link detection request sent by the proxy device responds to indicate that the IMS network or the NGN network sends an incoming call request to the second SIP distribution proxy device that responds to the link detection request; or

And when the all application servers under the first SIP distribution agent device are abnormal, switching the incoming call request to the second SIP distribution agent device by using a soft switch; or

Preferably, the application server under the first SIP distribution proxy device is configured to: when the application server detects that the first SIP distribution proxy device is abnormal, send an outgoing call request to the second SIP distribution proxy device.

Preferably, the first SIP distribution proxy device is further configured to: detect, by using a link detection mechanism, a connection situation with multiple application servers under the second SIP distribution proxy device;

The second SIP distribution proxy device is further configured to: detect a connection with a plurality of application servers under the first SIP distribution proxy device by a link detection mechanism. The embodiment of the present invention provides a network disaster tolerance method and system, when the first SIP distribution proxy device cannot process the received service request, handing over the service request to the second SIP distribution proxy device, the first SIP The distribution agent device and the second SIP distribution agent device are mutually backup devices in normal operation, and the second SIP distribution agent device processes the service request handed over by the first SIP distribution agent device, thereby implementing SIP The distribution agent device responds abnormally quickly, and solves the problem that the network distribution agent device is faulty and causes the network to be globally paralyzed. BRIEF abstract

1 is a schematic structural diagram of a network disaster tolerance system according to Embodiment 1 of the present invention; FIG. 2 is a network disaster tolerance method and a flowchart according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of a network disaster tolerance system according to Embodiment 2 of the present invention; FIG. 4 is a flowchart of disaster tolerance when an SS is invoked by a SIP distribution proxy device according to Embodiment 2 of the present invention;

FIG. 5 is a flowchart of disaster tolerance when an application server actively initiates an outbound call by a SIP distribution proxy device according to Embodiment 2 of the present invention. Preferred embodiment of the invention

When the SIP distribution agent device fails, the bottleneck is easy to occur. Even if the SIP distribution agent device uses the active/standby dual-system, a certain switching time is required, or the switching failure occurs due to the failure of the dual-machine itself, resulting in a global network failure, which is not conducive to the service. The launch. Therefore, there is an urgent need for a SIP distribution agent device to provide a reliable security backup mechanism to ensure the normal operation of the network to the utmost extent. In the event of a disaster, the service is still guaranteed, and the disaster resistance is strong, and it is possible to have a constant communication in times of crisis. lifeline.

In order to solve the above problem, an embodiment of the present invention provides a network disaster tolerance method and system. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of non-conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

First, the first embodiment of the present invention will be described with reference to the accompanying drawings. In the embodiment of the present invention, the incoming and outgoing calls of the SIP message implement the disaster tolerance mechanism, including the disaster tolerance of the SS incoming call implemented by the SIP distribution proxy device and the disaster tolerance of the active outgoing call of the application server implemented by the SIP distribution proxy device.

The embodiment of the invention provides a network disaster tolerance system. The structure of the system is as shown in FIG. 1 , which includes:

The first SIP distribution agent device 101 and the second SIP distribution agent device 103.

Preferably, the system further includes a plurality of application servers 102 under the first SIP distribution agent device, and a plurality of application servers 104 under the second SIP distribution agent device.

The first SIP distribution proxy device 101 and the second SIP distribution proxy device 103 are mutually backup devices in normal operation, and the plurality of application servers 102 and the second under the first SIP distribution proxy device 101 The plurality of application servers 104 under the SIP distribution agent device 103 are corresponding to each other as a backup device. It should be noted that, when the number of application servers under the first SIP distribution proxy device 101 and the second SIP distribution proxy device 103 are different, generally, the first SIP distribution proxy device 101 and the second SIP distribution proxy device 103 are different. In this case, some of the additional application servers do not need to be backed up.

The first SIP distribution agent device 101 and the plurality of application servers 102 thereunder constitute one office, and the second SIP distribution agent device 103 and the plurality of application servers 104 under it constitute another site.

The first SIP distribution agent device 101 and the second SIP distribution agent device 103 are connected to an IMS network or an NGN network.

Both the first SIP distribution agent device 101 and the second SIP distribution agent device 103 always need to maintain a link detection mechanism with the subsequent application server and the backup application server of these application servers, that is, the SIP distribution agent device can know in real time. The link of the application server is good or bad. When the soft switch (SS) calls in, the SIP distribution agent determines whether the message is sent to the next application server or the backup application server.

The application server also performs link detection on the softswitch, that is, the application server can reach the SS through the first SIP distribution agent device or the second SIP distribution agent device, and as long as one of the SIP distribution agent devices is good, it can be considered The SS has no broken links, and also knows which SIP points. The proxy device link is normal, which is abnormal, and the SS is unavailable only when the link of the active and standby SIP distribution proxy devices is abnormal, so that the application server can confirm the SIP distribution through the outbound call. The proxy device calls to the SS. The application server also has an OPTIONS link detection mechanism to maintain the detection of links arriving at all SSs, or the normality of all links.

The SIP distribution agent device may be integrated on an application server in the office, and the application server performs the corresponding function; preferably, in order to prevent the application server from malfunctioning, the SIP distribution agent device cannot function, and the SIP distribution may also be performed. The proxy device is integrated on the SIP proxy server to increase system reliability.

A network disaster recovery method provided by an embodiment of the present invention is described below in conjunction with the network disaster tolerance system.

The embodiment of the present invention provides a network disaster recovery method, and the process for completing the fault processing of the SIP distribution agent device by using the method is as shown in FIG. 2, which includes:

Step 201: When the first SIP distribution proxy device is unable to process the received service request, handing over the service request to the second SIP distribution proxy device;

In this step, when the first SIP distribution agent device is normal, the SS sends a SIP message to the first SIP distribution agent device, and at this time, it depends on the main application server to which the distribution policy needs to be distributed (for convenience of description, the first SIP distribution agent is used for convenience of description) The application server under the device is called the main application server, and the application server that is the backup device of the second SIP distribution agent device and the main application server is the backup application server; in fact, the application server under the first SIP distribution agent device The application server under the second SIP distribution agent device is a backup device, and the application server under the first SIP distribution agent device is also the backup application server. If it is normal, it will be distributed to the main application server, otherwise it will be distributed to the backup application server for processing.

When the primary SIP distribution agent device is abnormal, the SS sends a SIP message to the second SIP distribution agent device, and at this time, it is normal whether the primary application server to which the distribution policy needs to be distributed is normal, and if it is normal, the primary application server is distributed, otherwise it is distributed to the backup. Application server processing.

Specifically, the service request is specifically an incoming call request sent by the IMS network or the NGN network to the first SIP distribution proxy device, where the first SIP distribution proxy device cannot process the received request. When the service request is made, the handover of the service request to the second SIP distribution agent device is specifically: when the first SIP distribution proxy device is abnormal, the first SIP distribution proxy device does not target the IMS network or the NGN network The link detection request sent by the first SIP distribution proxy device responds to instruct the IMS network or the NGN network to send an incoming call request to the second SIP distribution proxy device that responds to the link detection request

Or the service request is specifically an incoming call request sent by the IMS network or the NGN network to the first SIP distribution proxy device, where the first SIP distribution proxy device fails to process the received service request The request for handover to the second SIP distribution agent device is specifically:

Or the service request is specifically an incoming call request sent by the IMS network or the NGN network to the first SIP distribution proxy device, where the first SIP distribution proxy device cannot process the received service request, The request for handover to the second SIP distribution agent device is specifically:

Or the service request is specifically an active outbound call sent by the application server under the first SIP distribution proxy device, and the service request is handed over when the first SIP distribution proxy device cannot process the received service request. The second SIP distribution agent device is specifically:

When the application server detects that the first SIP distribution agent device is abnormal (such as no response to the link detection request), the application server sends an outgoing call request to the second SIP distribution agent device.

Step 202: The second SIP distribution proxy device processes the service request handed over by the first SIP distribution proxy device.

In this step, the second SIP distribution agent device or the application server under it completes the service request handed over by the first SIP distribution agent device.

Embodiment 2 of the present invention will be described below with reference to the accompanying drawings.

The embodiment of the present invention provides a network disaster tolerance system. To solve the above problem, the present invention further provides a disaster recovery system implemented by a SIP distribution agent device. As shown in FIG. 3, the method includes: There are several SIP distribution agent devices and application servers in the two sites. The A site includes the SIP distribution agent device 1, the application server 1 and the application server 2 (in fact, the application server under the SIP distribution agent device is more, here for convenience of description, taking two application servers as an example) to form a system. The business process is completed; another site B has a SIP distribution agent device 2, an application server, and an application server 2, which form a system to complete the business process.

The SIP distribution agent device has a SIP distribution agent device link detection module, and the SIP distribution agent device always needs to maintain a link detection mechanism with the subsequent application server and the backup application server of the application server to obtain the normality of the application server. Information.

The application server has an OPTIONS link detection mechanism, which maintains information about detecting links to all SSs, or whether all links are normal or not.

Preferably, the backup SIP distribution agent device that can configure the SIP distribution device 1 on the interface A is a SIP distribution device, the backup application server of the application server 1 is configured as an application server, and the backup application server of the application server 2 is configured as an application server. 2'; At the same time, in B, the backup SIP distribution agent device of the SIP distribution device 1' is the SIP distribution device 1, the backup application server of the application server 1' is configured as the application server 1, and the backup application server of the application server 2' is configured as an application. Server 2. The SIP distribution device 1 corresponds to the first SIP distribution agent device 101 in the first embodiment of the present invention; the SIP distribution device 1 corresponds to the second SIP distribution agent device 103 in the first embodiment of the present invention.

The embodiment of the present invention provides a reliable security backup mechanism. When the device is not added, the application server and the SIP distribution proxy device of the two sites back up each other, and automatically switch when the disaster occurs, so as to ensure the normal development of the service. In order to maximize the normal operation of the network.

The technical solutions of the present invention are described in detail below with reference to the accompanying drawings and specific embodiments, which are not to be construed as limiting the scope of the invention.

Referring to FIG. 1, in the present invention, a simple networking is used to describe the service disaster recovery by the SIP distribution agent device. A site A has a SIP distribution agent device 1 and an application server 1, the application server 2 forms a system, completes the service processing, and another site B has a SIP distribution agent device 2 and an application server Γ, an application server 2, A system that completes business processing.

SIP distribution agent device 1 always needs and application server 1, application server 2, application service The application server 2' maintains a link detection mechanism (detecting requests and responses through links). Similarly, the SIP distribution agent device 2 also always needs to maintain a link detection mechanism with the application server 1, the application server 2, the application server, and the application server 2'.

In normal normal operation, the A and B stations work independently and do not interfere with each other; when an abnormality occurs, the message will be processed by another site that is backed up with the failed site.

Referring to FIG. 4, the disaster recovery processing procedure of the SS incoming call implemented by the SIP distribution proxy device in the network disaster tolerance system by using the network disaster tolerance method provided by the embodiment of the present invention is further described:

Scenario: An IMS or NGN environment call-in request, for example, an incoming call to the A-office point.

In the event of an earthquake in Area A, the equipment at Site A is damaged. Among them, the SIP distribution agent device 1 is abnormal, and the application server 1 and 2 may be abnormal. The SIP distribution agent device 1 is normal, and the application server 1 and 2 are all. Abnormal situation; the SIP distribution agent device 1 is normal, and the application server 1 and 2 are partially damaged. Wherein, 201, 202, 203, 204 are abnormalities of the SIP distribution agent device 1, and the application server 1 and 2 may be abnormal; 201, 205, 206, 207 are normal for the SIP distribution agent device 1, and the application servers 1 and 2 are all abnormal. Cases; 201, 208, 209, 210, 211, 212, 213 are cases where the SIP distribution agent device 1 is normal and the application server 1, 2 is partially damaged. 214, 215 is a case where the SIP distribution agent device 1 is normal, and the application server 1 and 2 are also normal.

First, the SIP distribution agent device 1 is abnormal, and the application servers 1 and 2 may be abnormal:

Step 401, an IMS or NGN environment call-in request, and a SIP dispatch agent device 1 that is normally called to the A-office point;

Step 402, the core network device SS sends a detection message to the SIP distribution agent device 1, and the SIP distribution agent device 1 does not respond, indicating that the SIP distribution agent device 1 has been damaged and cannot process the service; Step 403, the SS finds that the SIP distribution agent device 1 has been damaged. , automatically switching the message to the SIP distribution agent device 2 of the B office;

Step 404, the SIP distribution agent device 2 further transfers the message to the application server or the application server 2 according to the policy allocation, and if it is the application server, the application server is normal. If it is normal, the application server Γ, if Abnormal, then its backup, that is, application server 1 processing; for application server 2, the same is true. Next, the case where the SIP distribution agent device 1 is normal and the application servers 1 and 2 are all damaged will be described:

Step 405, the core network device SS sends a detection message to the SIP distribution agent device 1. The SIP distribution agent device 1 itself is good, but the SIP distribution agent device 1 finds that all subsequent application servers do not have heartbeat messages, so the SIP distribution agent device 1 The SS does not respond to the detection message, and the SS finds that there is no response, indicating that all the application servers have been damaged. The situation is equivalent to the SIP distribution agent device 1 being damaged and unable to process the service;

Step 406, the softswitch finds that all the application servers behind the SIP distribution proxy device 1 have been damaged, and automatically switches the message to the SIP distribution proxy device 2 of the B site;

Step 407, the SIP distribution agent device 2 transfers the message to the application server or the application server 2 according to the capability allocation, and performs processing.

Next, the case where the SIP distribution agent device 1 is normal and the application server 1 and 2 are partially damaged is explained:

Step 408, the core network device SS sends a detection message to the SIP distribution agent device 1. The SIP distribution agent device 1 itself is good, but the SIP distribution agent device 1 finds that the subsequent application server 1 has no heartbeat message, and the application server 2 has a heartbeat. Message, so the SIP distribution agent device 1 responds to the SS detection message, tells the SS that itself (the SIP distribution agent device 1) is available, and the SIP distribution agent device 1 itself determines that the application server 1 is damaged, and the application server 2 is normal;

Step 409, the softswitch finds that the SIP distribution proxy device 1 is available, and sends the message to the SIP distribution proxy device 1 for processing;

Step 410: The SIP distribution proxy device 1 searches for an available application server according to the configured distribution policy, and finds that it needs to be allocated to the application server 1 for processing;

Step 411, the SIP distribution proxy device 1 should be distributed to the application server 1 for processing, but the application server 1 has been damaged, so the standby application server 1 is found to process the message; Step 412: The SIP distribution proxy device 1 searches for an available application server according to the configured distribution policy, and finds that it needs to be allocated to the application server 2 for processing;

Step 413: If the application server 2 is normal, the application server 2 processes the message.

Next, the case where the SIP distribution agent device 1 is normal and the application servers 1 and 2 are also normal is explained:

Step 414, the core network device SS sends a detection message to the SIP distribution agent device 1. The SIP distribution agent device 1 itself is good, and the SIP distribution agent device 1 finds that the subsequent application server 1 and 2 are also good, that is, the A site. Both are normal, which is the most common scenario when there is no disaster.

In step 415, the SIP distribution agent device 1 distributes to the application server 1 or 2 according to the policy.

Referring to FIG. 5, the disaster recovery processing procedure when the SIP distribution proxy device implements the active outbound call of the application server in the network disaster recovery system provided by the embodiment of the present invention is further described:

Step 501: The core network device SS sends a SIP request message to the SIP distribution proxy device. In principle, the primary SIP distribution proxy device, that is, the SIP distribution proxy device 1 and the SIP distribution proxy device, should be selected;

Step 502: The core network device SS sends a detection message to the SIP distribution proxy device 1, and the SIP distribution proxy device 1 responds, indicating that it is normal;

Step 503: The core network device SS sends a detection message to the SIP distribution proxy device 1, and the SIP distribution proxy device 1 does not respond, indicating that it is damaged;

Step 504: The core network device SS discovers that the SIP distribution proxy device 1 is normal, and sends a SIP request message to the SIP distribution proxy device 1.

Step 505: The core network device SS discovers that the SIP distribution proxy device 1 is damaged, and sends the SIP request message to the SIP distribution proxy device.

Step 506, whether the SIP distribution proxy device 1 or the SIP distribution proxy device 外, calls the SIP request message to the IMS or the NGN network, so that the SIP distribution proxy device implements the disaster recovery processing flow when the application server actively calls out. The network disaster tolerance method provided by the embodiment of the present invention may be used to handover the service request when the first SIP distribution proxy device cannot process the received service request in the network disaster tolerance system provided by the embodiment of the present invention. Up to the second SIP distribution agent device, the first SIP distribution agent device and the second SIP distribution agent device are mutually backup devices in normal operation, and the first SIP distribution agent device processes the first The service request handed over by the SIP distribution agent device realizes a quick response to the abnormality of the SIP distribution agent device, and solves the problem that the network distribution network device is globally paralyzed when the SIP distribution agent device fails. The application server and the SIP distribution agent device of the two sites are backed up without any additional equipment. When a disaster occurs, the switchover is automatically performed to ensure the normal operation of the service to ensure the normal operation of the network.

It will be understood by those skilled in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Optionally, all or part of the steps of the foregoing embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any particular combination of hardware and software.

The various devices/function modules/functional units in the above embodiments may be implemented using a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

Each device/function module/functional unit in the above embodiments can be stored in a computer readable storage medium when implemented in the form of a software function module and sold or used as a standalone product. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Any changes or substitutions that are readily conceivable within the scope of the present invention are intended to be included within the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims. Industrial Applicability The present invention provides a network disaster tolerance method and system, and when the first SIP distribution proxy device cannot process the received service request, handing over the service request to the second SIP distribution proxy device, The first SIP distribution agent device and the second SIP distribution agent device are mutually backup devices in normal operation, and the second SIP distribution agent device processes the service request handed over by the first SIP distribution agent device to implement The quick response to the abnormality of the SIP distribution agent device solves the problem that the network is globally paralyzed when the SIP distribution agent device fails.

Claims

Claim

1. A network disaster recovery method, including:

Handling the service request to a second SIP distribution agent device, the first SIP distribution agent device and the second SIP distribution when the first Session Initiation Protocol (SIP) distribution agent device is unable to process the received service request The proxy devices are backup devices of each other in normal work;

The network disaster tolerance method according to claim 1, wherein the plurality of application servers under the first SIP distribution agent device and the plurality of application servers under the second SIP distribution agent device are mutually Backup device.

The network disaster tolerance method according to claim 1 or 2, wherein the service request is a call sent by the IP Multimedia System (IMS) network or a Next Generation Network (NGN) network to the first SIP distribution proxy device. In the request, when the first SIP distribution agent device is unable to process the received service request, handing over the service request to the second SIP distribution agent device is:

The network disaster tolerance method according to claim 1 or 2, wherein the service request is an incoming call request sent by the IMS network or the NGN network to the first SIP distribution proxy device, the first

When the SIP distribution agent device is unable to process the received service request, the service request is handed over to the second SIP distribution agent device as:

The network disaster tolerance method according to claim 2, wherein the service request is an incoming call request sent by the IMS network or the NGN network to the first SIP distribution proxy device, where the first SIP distribution proxy device When the received service request cannot be processed, the transfer of the service request to the second SIP distribution agent device is: And when the application server that processes the incoming call request is abnormal under the first SIP distribution proxy device, forwarding the incoming call request to a backup device of the application server under the second SIP server.

The network disaster tolerance method according to claim 1 or 2, wherein the service request is an active outbound call sent by an application server under the first SIP distribution proxy device, and the first SIP distribution proxy device When the received service request cannot be processed, the service request is handed over to the second SIP distribution agent device:

The network disaster tolerance method according to claim 1 or 2, wherein the method further comprises: the first SIP distribution proxy device detecting multiples under the second SIP distribution proxy device by using a link detection mechanism The connection situation of the application server, the second SIP distribution agent device detects a connection with a plurality of application servers under the first SIP distribution agent device by using a link detection mechanism.

8. A network disaster tolerance system, comprising: a first SIP distribution agent device and a second SIP distribution agent device, wherein the first SIP distribution agent device and the second SIP distribution agent device are mutually backup devices in normal operation ;

The first SIP distribution proxy device is configured to: when the unable to process the received service request, hand over the service request to the second SIP distribution proxy device;

The second SIP distribution agent device is configured to: process the service request handed over by the first SIP distribution agent device.

The network disaster tolerance system according to claim 8, wherein the system further comprises a plurality of application servers under the first SIP distribution agent device and a plurality of application servers under the second SIP distribution agent device, The plurality of application servers under the first SIP distribution agent device and the plurality of application servers under the second SIP distribution agent device are in a one-to-one correspondence with each other as a backup device.

The network disaster tolerance system according to claim 9, wherein the first SIP distribution proxy device is configured to: when the first SIP distribution proxy device is abnormal, the first SIP distribution proxy device is not correct Reacting to the link detection request sent by the IMS network or the NGN network to the first SIP distribution proxy device to indicate that the IMS network or the NGN network responds to the response The second SIP distribution proxy device of the link detection request sends an incoming call request; or, when all application servers under the first SIP distribution proxy device are abnormal, switching the incoming call request to the a second SIP distribution agent device; or,

11. The network disaster tolerance system according to claim 9, wherein

The application server under the first SIP distribution agent device is configured to: when the application server detects that the first SIP distribution agent device is abnormal, send an outgoing call request to the second SIP distribution agent device.

The network disaster tolerance system according to any one of claims 8 to 11, wherein

The first SIP distribution proxy device is further configured to: detect, by using a link detection mechanism, a connection with multiple application servers under the second SIP distribution proxy device;

The second SIP distribution proxy device is further configured to: detect a connection with a plurality of application servers under the first SIP distribution proxy device by a link detection mechanism.