PURPOSE: To perform communication without an unpleasant feeling by attaining a communication state by a call termination sound ringing part when call termination signals arrive from a telephone line and controlling a call termination volume and performing the communication between an intercom and a receiver by the volume smaller than usual when the call termination signals arrive from the telephone line during the communication with the intercom.
CONSTITUTION: When the call termination signals arrive from the telephone line during standby, they are detected in a telephone line call termination detection part 3 and call termination sound signals part generated from a caller signal generation part 4. For the signals, since the signals from an intercom speech path control part are the signals for indicating that the communication is not to be performed with the intercom 2, the normal call termination volume is outputted and the normal call termination volume is outputted by the call termination sound ringing part 6. Then, when a user picks up the receiver 9, a hook switch 10 is closed and the communication state is attained. Then, when the call termination signals arrive from the telephone line during the communication with the intercom, by the signals of the intercom speech path control part 7, a speech path switching device 8 is switched to the side of the intercom 2, the switch 10 is closed since the receiver 9 is picked up, the communication is performed between the intercom 2 and the receiver 9 and call termination volume control 5 is performed.
TAMURA SHIRO
SHINOZAKI HIDEJI
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