| 摘要 |
PURPOSE:To decrease the transfer time by discriminating and counting a dial signal from an outgoing subscriber of a trunk line side during talking to transfer an incoming call to a desired extension telephone set depending on the will of the outgoing subscriber. CONSTITUTION:Extension telephone sets 1, 2 are connected to a switch notwork 5 of a private branch of exchange via lines 3, 4 respectively, and the lines 3, 4 and the network 5 are controlled by a central controller 8. Further, a trunk circuit 6 is connected to the network 5, a signal discriminating section 60 of the circuit 6 discriminates a voice signal and a dial signal incoming from a trunk line 7 and a register section 61 counts the dial signal. The counted dial signal is returned to the controller 8. Moreover, the dial signal from the trunk line 7 is received and counted, an incoming call is transferred to the telephone sets 1, 2 depending on the dial signal and the call is connected to the desired telephone sets 1, 2 by the will of the calling subscriber. |
