| 摘要 |
PURPOSE:To prevent control channel signals for calling from being interfered With each other by allowing a specific slave set to implement extension/trunk line talking through a designated master set when the master set sends a control channel signal to all slave sets at a time difference at the arrival of a speech signal. CONSTITUTION:When an incoming call signal for talking comes from a trunk line 16a, the incoming call signal is detected by a trunk line control unit 12 of a master set 11. The incoming call signal is sent to a control unit 15, where the signal is discriminated. When the incoming call signal is a signal for a cordless telephone set 18a, the incoming call signal is sent to a ROM of the unit 15. A timer in a program is discriminated in the ROM and a control channel signal to call 1st slave set 18aa, a 2nd slave set 18ab,... is generated. Then a time switch 13 is switched upon the receipt of a reply of the control channel signal generated with a time difference and the talking between the 1st slave set 18aa and a talker is implemented. When the talking is finished, talking with other slave sets 18ab,...,19aa,... is implemented. |
