Patent ID: 8199694

Claim:
A method, comprising: by a mobile station and during a session, notifying at least one Base Station (BS) to switch a Service Option to circuit data, the at least one BS being of a pair of base stations comprising a source BS and a target BS, each of the source BS and the target BS being an opposite end BS with respect to each other; by the at least one BS, making a negotiation with a mobile switching subsystem about the switching to the circuit data and accordingly determining bearer format parameters of the session; by the at least one BS and after the negotiation with the mobile switching subsystem succeeds, making a secondary service negotiation with the mobile station; and after the negotiation with the mobile station succeeds and in the circuit data, and by the at least one BS, conducting user interface traffic layer encapsulation according to a certain load format, and then transmitting encapsulated Real-Time Transport Protocol packets to the opposite end BS.