SIP (Session Initiation Protocol) relay routing method and system thereof

Abstract

The invention provides an SIP (Session Initiation Protocol) relay routing method for realizing the effective combination of a balanced route and a priority level route and a system for realizing the method, wherein an independent route list of each call is established according to a balanced strategy; each item of the list is endowed with different priority levels; and the balanced route and the priority level route are effectively combined. In the method, the load balance of the routes can be realized in two relay gateways in a city; the redundancy backup of the routes can be finished in therelay gateway between two cities; when the route call of the relay gateway in one city can not be realized, the out route call in the other city can be realized; meanwhile, the load balance and the route backup between the relay gateways inside the city can be simultaneously ensured; and the reliability of the system can reach carrier-class requirements.

Description

technical field [0001] The invention relates to a relay routing technology for session control based on SIP (Session Initiation Protocol) signaling in the field of VoIP (Voice over IP) communication, in particular to equipment and methods for routing redundancy and load balancing in relay routing. Background technique [0002] In the existing SIP trunk routing methods, there is no good solution to solve the coexistence of load balancing and routing redundancy of the trunk gateway in the SIP trunk routing system. [0003] Such as figure 1 In the shown SIP trunk routing system, one SIP server and more than two trunk gateways are respectively deployed in places A and B, and each trunk gateway is connected to a local SIP server. Among them, the SIP server is used to select a route to forward SIP signaling, and the relay gateway is used to complete signaling and media relay between two different bearer networks or different management domain networks. Calls between places A or ...

AI Technical Summary

Problems solved by technology

[0004] In actual use, if the above SIP trunk routing system is a balanced routing system, the identities of the trunk gateways in the system are equal and cannot be distinguished. The caller in the locality may initiate the call through the trunk gateway in the B place; if the SIP trunk routing system is a priority routing system, although the system can distinguish the trunk gateways in A and B according to the priority, it also distinguishes the local Internal redundant trunk gateway, if the trunk gateway with high priority fails, because it is a priority routing system, each call will go to the trunk gateway with high priority first, but at this time because the trunk gateway fails, so There will be a certain delay in detecting faults, reducing user experience

[0005] In addition, the existing SIP trunk routing method does not distinguish between the called user and the final response code of 4xx and above (request failure) of the trunk gateway, which leads to SIP in the environment of redundant routing of multiple trunk gateways. The server cannot distinguish whether the final response code above 4xx is the final response returned by a relay gateway error (such as insufficient resources), or the final response caused by the error of the called user or the user's network (such as a busy line)

Since the SIP server does not differentiate after receiving 4xx and above request failure response messages, all of them will go to the next highest priority route, which will cause the call request to fail in the final response process of 4xx and above caused by the end user error. Routed to the called party multiple times; when the final response code of 4xx and above is replied by the trunk gateway (error not caused by the called factor), if the SIP server does not go to the next redundant route, the current call fails immediately , resulting in increased call loss, and the route redundancy backup of multiple trunk gateways cannot be presented

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