Patent ID: 8335487
Filing Date: 2012-12-18
Classification: H04L

Abstract:
1. A method for authenticating a user equipment in an IP multimedia subsystem, comprising: generating, by a Serving-Call Session Control Function (S-CSCF) entity, an authentication challenge through a Digest Authentication Algorithm in response to a subscriber request, and sending the authentication challenge to the user equipment through a Proxy-Call Session Control Function (P-CSCF) entity; receiving, by the user equipment, the authentication challenge; generating, by the user equipment, an authentication response through the Digest Authentication Algorithm in accordance with a subscriber key and the authentication challenge, and sending the authentication response to the S-CSCF entity through the P-CSCF entity; receiving, by the S-CSCF entity, the authentication response; and verifying, by the S-CSCF entity, the authentication response through the Digest Authentication Algorithm in accordance with information HA wherein the Digest Authentication Algorithm includes a Digest MD5 algorithm, and the S-CSCF entity obtains the HA wherein the obtaining the HA