Method and system for keeping single radio voice call continuity session alive

摘要

A method and system are provided for keeping a single radio voice call continuity session alive. The method comprises, during switching of a terminal from a packet switch domain to a circuit switch domain, an application layer gateway establishing a new signaling connection with an enhanced mobile switch center after receiving a first transfer request and notifying a service centralization and continuity application server (SCC AS) to establish a new signaling connection with the application layer gateway, and the SCC AS establishing a new signaling connection with the application layer gateway according to the notification. Using the technical scheme of the method and system provided, the problem of call interruption due to a UE being unable to perform IMS re-registration in a destination domain in a single radio voice call continuity process in the prior art is solved.