| 摘要 |
A telephone exchange apparatus includes a first interface to connect a circuit line being connected at least one of terminal and transmitting a corresponding speech signal, a plurality of second interfaces to connect a communication network including a plurality of speech channels allowing a transmission of a plurality of speech packets and at least one of control channel allowing a transmission of a plurality of control packets, a exchanger which connects between the first interface and at least one of the second interfaces according to a call setting request, and a controller which controls to forward an incoming call to another second interface, when the incoming call arrives through the control channel of the connection network and there exists no available communication channels, in each the second interfaces.
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