1. A method for keeping a single radio voice call continuity session alive comprising:
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 from the enhanced
mobile switch center, sending a response message of the first transfer request to the enhanced mobile switch center after
establishing the new signaling connection, and notifying, by the application layer gateway, 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 besides an original signaling connection with the application layer gateway according to the notification
from the application layer gateway.