Method, relative device and system for achieving restoration terminal called service

Abstract

The invention discloses a method, relative device and system for achieving restoration of a terminal called service. The method comprises the steps that when a called request to a user terminal is received, and an initial proxy call session control function entity (P-CSCF) currently registered by the user terminal is inquired; if the fact that the initial P-CSCF goes wrong is detected, an available P-CSCF is selected, notification messages carrying disaster tolerance identification are sent to the available P-CSCF, and the disaster tolerance identification is used for indicating the available P-CSCF to trigger the user terminal to re-register the P-CSCF; when the register completing information sent by the re-registered P-CSCF of the user terminal is received, the called request is sent down to the re-registered P-CSCF to bear the called service of the user terminal. Through the adoption of the method, relative device and system for achieving the restoration of the terminal called service, failure recovery can be completed rapidly in existing network architecture.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, a related device and a system for realizing the recovery of a terminal called service. Background technique [0002] The CSCF (Call Session Control Function, call session control function) is a functional entity in the IP Multimedia Subsystem (IP Multimedia Subsystem, IMS), and is mainly responsible for processing signaling control during a multimedia call session. The CSCF can be divided into P-CSCF (Proxy CSCF, acting CSCF), I-CSCF (Interrogating CSCF, querying CSCF), and S-CSCF (Serving CSCF, serving CSCF). [0003] In the process of service control, if the P-CSCF fails, if the user terminal registered with the P-CSCF is called, and the S-CSCF finds that the P-SCCF fails when managing the called service, it will The terminal user cannot be contacted through the P-CSCF, resulting in service failure. [0004] In the prior art, two P-CSCFs are used to f...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the main disadvantages of the solution adopting the master-standby data backup include: the heartbeat detection between the master and slave network elements may easily cause dual-master failures, resulting in the inability of the master and slave network elements to perform services; Presenting the same IP to the outside requires the support of the near-end router, and the processing is more complicated

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