| 摘要 |
PURPOSE:To improve operability of retransmission by a pushbutton telephone set by a user of a pushbutton telephone set using a loudspeaking talk function and a retransmission function and by calling a line wire called person only by making a one-time operation of the retransmission button. CONSTITUTION:When a user, who resets a speaker button SB because of finding a called person engaged, operates the retransmission button RS after sometime, a control signal is transmitted to a main device MTU through a control-signal line CL. When the device MTU analyzes the control signal with its control-signal analyzing part SA and discriminates the signal from the button RS's control signal, a loudspeaking line-wire connection retransmitting part SCRD is actuated and a telephone set KTU1 is made to transmit the control signal for setting a loudspeaking talk condition. At the same time, the system connects a line controller LNC1 to an intraoffice trunk IOT through a channel switch. When the telephone KTU1 receives a dial tone of the trunk IOT, a control signal transferring part SS sets the KTU1 to a louspeaking talk condition. |
