Study and design of call model in mobile softwitch

Call model is the core in mobile softswitch design. On the basis of analyzing existing mobile softswitch call model a distributed MSC-Server call model is put forward. This model realized mobile station initiate the forward direction bearer establishment call control flow and route selection. This call-controlling model realizes the separation of call control and medium bearer,and the separation of service logic and call control,and it allows the accessing of multi-protocols,making call control indepent of underlying bearer protocols,and thus meeting the needs of the call control in mobile softswitch.