| 摘要 |
PURPOSE:To display the telephone number of a transmitting source on a display part before a receiver is picked up by installing a telephone number transmitting part and a telephone number identifying circuit to respective telephone systems. CONSTITUTION:In a selecting signal transmitting means 10, a telephone number transmitting part 10B to output a signal to succeed to the transmission of a selecting signal and to relate to the telephone number of a transmitting source is provided and in a receiver circuit 11, a telephone number identifying circuit 1A to identify a signal to relate to the telephone number of the transmitting source sent from the transmitting source and a display part 1B to display the telephone number of the transmitting source identified by this telephone number identifying circuit 1A are put side by side. When a dialing is finished and a calling condition is set, the telephone number transmitting part 10B is operated, repeats the telephone number of a transmitting side and transmits it via a PBX to a receiving side. Thus, the telephone number identifying circuit 2A of the receiving side is operated, the telephone number of the receiving side is recognized, distinguished and displayed on a display part 2B.
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