| 摘要 |
PURPOSE:To attain the listening of a voice of an opposite subscriber even during holding by providing a 2-wire/4-wire converting circuit to the pre-stage of a holding signal transmission circuit. CONSTITUTION:Since the 2-wire/4-wire converting circuit 5 is provided to the pre-stage of a holding signal transmission circuit 4a during holding, a holding signal of the holding signal transmission circuit 4a is transmitted to the opposite party via the converting circuit 5. In this state, since a talking signal is inputted to a voice output section 6 via the converting circuit 5 by the speaking of the opposite subscriber, the talking voice is outputted via a speaker and a holding person recognizes the calling of the opposite subscriber. |
