| 摘要 |
PURPOSE:To reduce the cost of facilitates with regard to both hardware and software, by providing a call signal stop switch between a telephone set or a subscriber circuit and a call signal trasmitter. CONSTITUTION:A stop switch 111 for the transmission of a call signal is equipped to a telephone set 110. A sigal in call signal transmission flows in the telephone set 110 as usual. The subscriber of the telephone set 110, when desires to stop the transmission of the call signal completely, only operates the switch 11 provided to the telephone set 110. In the figure, 112 denotes a hook switch, 113 a bell, 114 a transmitter, and 115 a receiver. |
