Huawei Technologies Co., Limited

Kai Wen

Jiongjiong Gu

Shufeng Shi

Feng Liang

Linfei Shen

Hui Li

A method for realizing an Internet protocol (IP) multimedia subsystem (IMS) disaster tolerance includes the steps as follows. An S-CSCF receives a user registration, and backs up necessary data which is required when a user service processing is restored on a storage entity in a network. An I-CSCF of user's home domain receives a service request of the user, and if it is found that the S-CSCF currently providing a service for the user fails, assigns a new S-CSCF to the user, and forwards the service request to the newly assigned S-CSCF. The newly assigned S-CSCF interrogates and acquires subscription data of the user and the necessary data backed up by the original S-CSCF from the storage entity, and then restores the user service processing according to the subscription data and the backup data. A device for realizing an IMS disaster tolerance is also provided.

Method and device for realizing IP multimedia subsystem disaster tolerance

A method for authenticating user terminal in IMS network, the method includes: with regard to user request, Service-Call Session Control Function (S-CSCF) entity creates the authentication challenge utilizing Digest Authentication Algorithm, and sends the authentication challenge to user terminal through Proxy-Call Session Control Function (P-CSCF) entity; the user terminal creates the authentication response utilizing Digest Authentication Algorithm according to the user key and associated parameters with said authentication challenge, and sends the authentication response to S-CSCF entity through S-CSCF entity; S-CSCF entity authenticates said authentication response utilizing Digest Authentication Algorithm according to HAI and associated parameters, if the authentication passes, determines that the user terminal is authenticated successfully, otherwise, determines that the user terminal is authenticated failure.

Method for authenticating user terminal in IP multimedia sub-system

A method and system is disclosed for enabling number portability in a communication session between a caller and a callee in an IMS network. When a caller or callee changes her subscription from a first network to a second network, mechanisms are implemented to have the number portability information provided so that the moved caller or callee can still engage in communication sessions using her original public identification number.

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Shenzhen, China

Kai Wen