| 摘要 |
PURPOSE:To respond to a visitor from a telephone set to which an interphone callout is automatically transferred even if the family is out, by providing a dial number storage circuit and an automatic dial means etc. to a conventional interphone device. CONSTITUTION:When the visitor depresses a button 2 of an interphone communicating device 1 during the absence, a control circuit 3 using a microcomputer detects the depression and drives an automatic dial circuit 6 and a switch circuit 7 so as to transmit a dial selection signal corresponding to a telephone number of a visiting place of the people stored in a dial number storage circuit 4 comprising semiconductors to a main trunk 5. When the family responds from the telephone set at the visiting place, the circuit 3 drives the circuit 6 and connects the device 1 to the main trunk 5. Further, when the visitor depresses the button 2 of the device 1 during the presence, the circuit 3 transmits a call tone to call out the family from a device 10, controls the circuit 7 to connect the device 1 to the device 10, allowing to call by using a speaker 11 and a microphone 12. |
