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1. (WO2017036227) METHOD AND DEVICE REALIZING TERMINAL CALLED SERVICE RESTORATION

Pub. No.:    WO/2017/036227    International Application No.:    PCT/CN2016/085852
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Jun 16 01:59:59 CEST 2016
IPC: H04L 12/24
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
华为技术有限公司
Inventors: WANG, Xinyong
王新勇
LI, Yunfei
李云飞
Title: METHOD AND DEVICE REALIZING TERMINAL CALLED SERVICE RESTORATION
Abstract:
The present invention discloses a method and device realizing terminal called service restoration, in which it is not necessary to trigger a terminal by a PCRF to repeatedly register an alternative P-CSCF, reducing deployment difficulty and saving resources. The method comprises: an alternative P-CSCF/SBC receiving a request message sent by an S-CSCF, the request message being generated by the S-CSCF when a P-CSCF/SBC registered by a user terminal corresponding to a received called request experiences a failure; the alternative P-CSCF/SBC, according to a mapping relationship between a pre-established gateway and each user terminal belonging to the gateway, determining a home gateway of the user terminal; and the alternative P-CSCF/SBC sending, via a TWAMP link with the home gateway, a trigger message to the home gateway, the trigger message being for triggering a user terminal to re-register to the alternative P-CSCF/SBC so as to carry the user terminal called service.