Patent ID: 9560147
Date: 2017-01-31
CPC Classifications: H04L

Claim:
1. A method comprising: a first Service Centralization and Continuity (SCC) Application Server (AS) (SCC AS) initially acting as an anchor point for a first Internet Protocol (IP) Multimedia Subsystem (IMS) session, the first IMS session involving at least a first wireless transmit/receive unit (WTRU) that is served by the first SCC AS, a second WTRU that is served by a second SCC AS that initially acts as an anchor proxy for the first IMS session, and a remote party; the first SCC AS transmitting an anchor-transfer message to the second SCC AS, the anchor-transfer message indicating a request that the second SCC AS act as the anchor point for the first IMS session; and the first SCC AS receiving an anchor-transfer response from the second SCC AS, wherein the first SCC AS responsively ceases acting as the anchor point for the first IMS session if the received anchor-transfer response indicates acceptance by the second SCC AS of the request that the second SCC AS act as the anchor point for the first IMS session.