| 摘要 |
PURPOSE:To easily confirm the position of a telephone set by including a circuit to transmit a radio call signal when an operating button is operated in a first radio transmission/reception circuit. CONSTITUTION:The circuit to transmit the radio call signal when the operating switch 18 is operated even in a state where no call signal arrives at a telephone line 11 is included in the first radio transmission/reception circuit 13. Therefore, the radio call signal is transmitted by operating the operating switch 18 by a user even when no call signal exists on the telephone circuit 11, and in the telephone set 2, a call signal identification circuit 23 identifies the fact, and a call acoustic sound is outputted from a call acoustic circuit 24. In such a way, it is possible to recognize the position of the telephone set 2 whose position is missed by the user. |
