| 主权项 |
1. A method for service control performed by a service centralization and continuity application server (SCC AS) in an IP multimedia subsystem (IMS) network, comprising:
receiving, by the SCC AS, from a first user equipment a first session initiation protocol (SIP) message for establishing an IMS centralized service (ICS) session between the first user equipment and a second user equipment; receiving, by the SCC AS, early session media information which is associated with the ICS session between the first user equipment and the second user equipment; sending, by the SCC AS, a second SIP message carrying the early session media information to a media gateway control device, wherein the early session media information is carried in the second SIP message in a form of regular session media information, to indicate the media gateway control device to use an existing circuit switched bearer to transmit the early session media information to the first user equipment, wherein the existing circuit switched bearer is established under control of the media gateway control device for a session between the first user equipment and a third user equipment; receiving, by the SCC AS, an off-hook signal from the second user equipment; and after receiving the off-hook signal, sending, by the SCC AS, regular session media information of the second user equipment to the media gateway control device. |
