Tandem system and method for calling route in tandem system

Abstract

A method for calling the route in the tandem system and the tandem system includes: set the interface in which the down calls interconnect between the first tandem office and the second tandem office based on the soft-switch; the first tandem office transmits the down calls received by it to the second tandem office connecting with the first tandem office via the interface, and the second tandem office calls the route for the down calls. The present invention can provide at least two routes for the down call, and it can implement the functions of the route backup and the load partaking etc. between the multiple down calling routes. The interface in which the down calls interconnect between the tandem offices of the present invention can use the interface of the SIP-T protocol, and it can implement the route backup and the load partaking of the down calls in the case that it does not add the extra physical device and the connect between the different or identical types of tandem offices. Thereby, it implements the purpose of saving the achieving cost and the maintaining cost of the route backup and the load partaking etc. of the down calls, and improving the reliability of the down calls.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a tandem system and a call routing method in the tandem system. Background technique [0002] With the development of telecommunication technology, NGN (next generation network) with softswitch as the core has been gradually applied in the telecommunication network due to its characteristics of large capacity, high integration, and separation of service, control and bearer. [0003] The network diagram of the softswitch as a tandem office is attached figure 1 shown. [0004] figure 1 In this case, all uplink calls of end office A are made through tandem office A. Conversely, all downlink calls that pass through the tandem office are routed to end office A through tandem office A. [0005] In consideration of load sharing and reliability, a dual-plane networking structure is generally adopted. The specific networking is shown in the attached figure 2 shown. ...

AI Technical Summary

Problems solved by technology

[0009] When adopting the networking mode of the traditional switch, that is, a switch not based on softswitch, in order to realize call routing backup, it is necessary to add an E1 trunk between the tandem office A and the tandem office B. E1 is defined by the ITU- The communication interfaces defined by T G.703, G704, and G706 not only need to increase additional network construction and maintenance costs, but also do not make full use of the advantages of NGN networks

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