| 摘要 |
The present invention relates to moving session control for a user element from a circuit-switched subsystem, such as a cellular network, to a multimedia subsystem (MS), such as the Internet Protocol (IP) Multimedia Subsystem (IMS). Session control is provided by the MS irrespective of whether the user element is using cellular or local wireless access for the sessions. Notably, multiple sessions may be controlled for a given user element at the same time. Session control for originating and terminating multiple simultaneous sessions in the CS or MS as well as transferring these sessions between the CS and MS is anchored at a continuity control function (CCF) in the MS. All session signaling for each of the multiple sessions is passed through the CCF. The CCF is a service provided in the MS, and anchors the user element's sessions as well as enables domain transfers between the CS and MS. |
