Patent ID: 8379650

Claim:
A method for providing services for a user, comprising: receiving, by an interrogating call session control function (I-CSCF), a failure response returned by a first serving call session control function (S-CSCF) according to a failure indication information, wherein the failure indication information is returned by a home subscriber server (HSS) after the HSS receives a request for requesting subscription data of the user sent by the first S-CSCF and determines that a stored name of the S-CSCF assigned to the user is not the same as that of the first S-CSCF, and the receiving is performed after the I-CSCF selects the first S-CSCF for the user and forwards a service request to the first S-CSCF; and obtaining, by the I-CSCF, information of a second S-CSCF, and forwarding the service request from the user to the second S-CSCF, wherein the second S-CSCF is the one assigned by the HSS for the user.