Patent ID: 7860060

Claim:
A method comprising, during a communication session for a multi-network user platform, 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 for use to maintain the communication session wherein the Session Initiation Protocol instance comprising, at least in part, session context information for the user platform that is on hold and wherein establishing in the first network a Session Initiation Protocol instance comprising establishing a Session Initiation Protocol user agent instantiation proxy, provisioning the Session Initiation Protocol user agent instantiation proxy with context information as corresponds to the communication session and transmitting the context information from the multi-network user platform to the Session Initiation Protocol user agent instantiation proxy; following a handoff of the communication session from the first network to a second network, using the Session Initiation Protocol instance to maintain communications with the Session Initiation Protocol server subsequent to the handoff by communicating with the Session Initiation Protocol server such that the Session Initiation Protocol server does not terminate the communication session.