Call routing method, device and system

Abstract

The present invention provides a call routing method, device, and system, which relate to the field of communication technology, wherein the method includes: I-CSCF receiving the first MGCF corresponding to the second-level area in the first-level area and sending by the CS network user call request; if the I-CSCF determines that the called number in the call request is a non-IMS user number, then route the call request to the first BGCF corresponding to the first-level area, so that the first The BGCF determines the first-level area to which the called number belongs according to the configured number segment information of each first-level area, and routes the call request to the second BGCF corresponding to the first-level area to which the called number belongs, so that The call request is routed by the second BGCF to the CS network of the secondary area to which the called number belongs. The technical scheme of the present invention realizes the dredging of calls between CS network users crossing the first-level area through the IMS network, saves the port resources of the traditional long-distance network, and can make full use of the advantages brought by the IP intercommunication of the IMS network.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a call routing method, device and system. Background technique [0002] IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) is a brand-new multimedia service form. As a technology that can realize all-IP networks, its main features are simplicity, flexibility, open standards, and independence from access networks. IMS The network can meet the needs of current end customers for more novel and diversified multimedia services, and has become the core part of the next-generation converged communication system, and it is also the evolution direction of the language exchange network. [0003] During the future development of the IMS network, it will coexist with CS (circuit switching, circuit switching)-based telephone networks (including PLMN, GSM and other circuit switching networks) for a long period of time. Therefore, the realization of IMS network and CS network...

AI Technical Summary

Problems solved by technology

[0004] Therefore, in the existing solution, inter-provincial calls between CS network users in different provinces can only pass through the CS long-distance network, occupying the port resources of the traditional long-distance network, and cannot take advantage of the advantages brought by the IP interworking of the IMS network

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