Patent ID: 7006827

Claim:
A mobile-service switching center comprising: determining section for determining whether a call request is a call from a first multicall communication mode supporting terminal, which is capable of supporting a plurality of calls at a time or from a single-call communication mode supporting terminal, which is capable of supporting only a single call at a time; event detecting section for detecting an event caused by a handover occurrence or fluctuation of a congested state; and call-number changing section capable of changing the number of continuing calls of the first multicall communication mode supporting terminal which is determined by the determining section, when an event is detected by the event detecting section detects any event during the communication, wherein the call-number changing section comprises: special message notifying section capable of transmitting a special message having inserted therein the number of calls changing information regarding the increases and decreases of the plurality of calls, to a base station controller for controlling a base station and the first multicall communication mode supporting terminal; reply receiving section for receiving a reply regarding a desired call to continue which is selected by the first multicall communication mode supporting terminal from the plurality of calls which are notified by the special message notifying section; and handover rearranging section for rearranging the connection status in such a manner that the desired call to continue which is designated in the reply received by the reply receiving section is maintained and an undesired call which is not selected by the first multicall communication mode supporting terminal is disconnected.