Patent ID: 7995565
Filing Date: 2011-08-09
Classification: H04L

Abstract:
1. A method executing on a user equipment (UE) device having a processor for operating in association with an ongoing call in an Internet Protocol (IP) multimedia subsystem (IMS) network, said method comprising: providing, via a Session Initiation Protocol (SIP) Invite message, call information associated with said ongoing call in one domain to a network node disposed in said IMS network, said SIP Invite message including an indication operable as an invocation for call continuity; receiving a routable number from said network node via a SIP response message, wherein said SIP response message comprises a SIP 380 (Alternative Service) Response message; verifying that a call reference number associated with said ongoing call is valid; and sending a message containing said routable number to said network node for effectuating call continuity with respect to said ongoing call in another domain.