Patent ID: 8031591
Filing Date: 2011-10-04
Classification: H04L

Abstract:
1. A method for providing services for a user, the method comprising: receiving, by a home subscriber server (HSS), a Server Assignment Request (SAR) for requesting subscription data of the user sent by a first serving call session control function (S-CSCF), wherein the first S-CSCF is selected by an interrogating call session control function (I-CSCF) for the user; determining, by the HSS, that a second S-CSCF assigned to the user is different from the first S-CSCF, wherein a name of the second S-CSCF is stored in the HSS; and returning, by the HSS, a Server Assignment Answer (SAA) to the first S-CSCF, wherein the SAA carries the name of the second S-CSCF and a failure indication information DIAMETER_ERROR_IDENTITY_ALREADY_REGISTERED, wherein the name of the second S-CSCF is transmitted to the I-CSCF from the first S-CSCF.