| 摘要 |
PROBLEM TO BE SOLVED: To precisely give communication change service accompanying the transfer request of a user and the occurrence of a fault in a system with a computer network as a center by providing a communication transfer control means switching the communication opposite party of communication heat communication terminal equipment executes to the other communication opposite party. SOLUTION: Relating to extension terminal equipment 3, when the change request operation of communication to other outer terminal equipment TT2 is executed from its own device by a user, the request signal is sent to a gate keeper GK. The gate keeper GK generates a transfer request signal to a public network NW and transmits it to the public network NW via LAN and the like. When the public network NW receives it, it starts a communication change service function, calls the outer terminal equipment TT2 of a transfer destination while a communication link during communication is kept, connects outer terminal equipment TT2 from outer terminal equipment 1 and cuts the communication link with a router RT. Thus, the communication destination of outer terminal equipment T1 is changed to outer terminal equipment TT2 from inner terminal equipment T3.
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