Patent ID: 7839826
Filing Date: 2010-11-23
Classification: H04L,H04W

Abstract:
1. A method comprising, during a communication session for a plurality of user platforms wherein at least one of the user platforms is on hold, for which communication session is presently occurring in a first network and wherein the communication session can be terminated by a Session Initiation Protocol server as comprises a part of that first network: establishing in the first network a Session Initiation Protocol instance as corresponding to the communication session wherein the Session Initiation Protocol instance comprises, at least in part, session context information for the user platform that is on hold; following a handoff of bearer support of the communication session from the first network to a second network, using the Session Initiation Protocol instance to replace the user platform in the first network and to maintain the hold status of the user platform that is on hold with the Session Initiation Protocol server subsequent to the handoff such that the Session Initiation Protocol server does not terminate the communication session; and using the session context information for the user platform that is on hold to effect, via the Session Initiation Protocol server, changing the user platform that is on hold to a user platform that is actively engaged in the communication session notwithstanding that bearer support for the communication session has been handed off to the second network.