Patent ID: 7746836
Filing Date: 2010-06-29
Classification: H04L,H04W

Abstract:
1. A method in a mobile station, the method comprising: sending an initial registration request message to a server, said initial registration message comprising a private user identifier and a first contact address; receiving and responding to an authentication challenge from and to said server, said private user identifier being successfully authenticated by said server; establishing an authenticated and secure first connection having at least one registration binding corresponding to said private user identifier and said first contact address; sending to said server, a second registration request message comprising said private user identification corresponding to said first connection, and a second contact address; receiving from said server, a registration success message comprising said second contact address and notification of a second connection for said private user identification using said second contact address; moving a registration binding from said first connection to said second connection such that said first connection no longer has any registration binding and is in an inactive state but continues to have at least one session; maintaining said at least one session on said first connection while said first connection is in said inactive state; and refreshing said at least one session on said second connection and releasing said at least one session on said first connection.