Patent ID: 8509120

Claim:
A method in a wireless network for managing IP Multimedia Subsystem (IMS) Centralized Services (ICS) sessions, the method comprising: receiving at a Mobile Switching Center (MSC) server from a Service Centralization and Continuity Application Server (SCC AS), a first message including an indication that the SCC AS is requesting notification of a change in status of a user terminal; subsequent to receipt of said first message, detecting, at the MSC server, that the user terminal has been transferred from a first access network to a second access network; determining, at the MSC server, that the user terminal is unable to simultaneously support a circuit-switched call and the transport of IP data in the second access network; and in response to said detecting and said determining, sending a second message to the SCC AS from the MSC server, the second message including an indication that the user terminal is unable to simultaneously support a circuit-switched call and the transport of IP data in the second access network, and indicating that the user terminal has been transferred; receiving, in response to said second message, one or more requests for MSC server-assisted mid-call feature services for the user terminal to maintain one or more held ICS sessions or conferences; and assigning transaction identifiers to one or more sessions held for the user terminal or to one or more conference participants corresponding to the user terminal, in response to said requests.