| 摘要 |
PURPOSE:To surely inform an incoming state by providing a means identifying the kind of a call to an incoming call when the call comes to a telephone set during talking and a means sending a different interruption tone according to the kind of the call. CONSTITUTION:A control section 3 is provided with a registration control means 31 registering the designation of a telephone number, port type and a hand free terminal equipment from a maintenance terminal 5 to a storage section 4 via the control section 3, an incoming call identification means 32 discriminating the kind of an incoming call while looking for a port type of the incoming call, an alarm tone sending means 33 sending an alarm tone according to the kind of the incoming call and an alarm tone stop means 34 detecting the operation of an alarm tone stop key to erase the alarm tone. Since a different busy interruption tone is sent depending on the kind of call incoming during talking, whether the call comes from an extension or a trunk line is distinguished and since the busy interruption tone is sent periodically, the looking-over of the incoming call is avoided.
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