Patent ID: 7024688
Filing Date: 2006-04-04
Classification: H04L,H04W

Abstract:
1. A method of authenticating a user agent to a server using Session Initiation Protocol (SIP) messages, the method comprising: forwarding a SIP request from the user agent to the server; forwarding a request for authentication from the server to the user agent in response to the SIP request, the request for authentication including information that the authentication will be performed using a Universal Mobile Telecommunications System (UMTS) Authentication and Key Agreement (AKA) mechanism, wherein a field therein comprises AUTN (authentication token) and RAND (random challenge), and RAND and AUTN vectors are included in a SIP WWW-Authenticate or a Proxy-Authenticate response header field; forwarding an authentication response from the user agent to the server in response to the request for authentication in accordance with the UMTS AKA mechanism wherein a field therein comprises RES (response) and AUTS (synchronization failure parameter); and performing an invoked SIP procedure on the server in response to the SIP request if the authentication is deemed successful in view of the authentication response.