Route calling method, device and system

Abstract

The invention provides a route calling method, device and system, and relates to the technical field of communications. The method comprises the steps that a calling request which is launched by a CS network user, is sent by a first MGCF and corresponds to a second-level region in a first-level region is received by an I-CSCF; if the I-CSCF determines that a called number in the calling request is a non-IMS user number, the calling request is routed to a first BGCF corresponding to the first-level region to ensure that a first-level region which the called number belongs to is determined by the first BGCF according to configured phone number information of each first-level region and the calling request is routed to a second BGCF corresponding to the first-level region which the called number belongs to and is further routed to the CS network of the second-level region which the called number belongs to from the second BGCF. According to the technical scheme of the route calling method, device and system, calling between cross-first region CS network users is unclogged through an IMS network, terminal resources of traditional long-distance networks are saved, and advantages brought by IP intercommunications in IMS networks can be fully utilized.

Description

technical field [0001] The present invention relates to the field of communication technology, 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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