| 摘要 |
Upon making a request for start of position registration for IP-telephone-terminal of an incoming-call-side, IP-telephone-terminal of an outgoing-call-side notifies the IP-telephone-terminal of identification information of the own terminal. If the user makes a request for terminal of the outgoing call before establishment of an IP-communication-link, the IP-telephone-terminal notifies the IP-telephone-terminal of the termination request indicating the termination of the outgoing call, together with the identification information of the IP-telephone-terminal of the outgoing call side. When the IP-telephone-terminal of the incoming call side receives the notification of the termination request, the IP-telephone-terminal disconnects the IP-communication-link established with the radio base station and becomes in the standby status if there is a single outgoing call terminal, or maintains the IP-communication-link established with the radio base station if there are a plurality of outgoing call terminals and the IP-telephone-terminal does not accept the terminal request from all the outgoing call terminals.
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