| 摘要 |
PURPOSE:To prevent an undesired call signal from being sent to an exchange in case of extension talking by applying connection control of external line communication and extension talking based on a switch operated at first after hook-off. CONSTITUTION:In making a dial from a radiotelephone set, a dial tone is returned from a master equipment. In operating a dial button 221 next, a radio transmitter/receiver 15 of the master equipment receives the signal and it is sent to a telephone set circuit 11. The telephone set circuit 11 connects the radiotelephone set and a wired telephone line 171 at first. On the other hand, when an extension button 222 is operated at first, the signal is received by the radio transmitter-receiver 15 of the master set and sent to the telephone set circuit 11. The radiotelephone set circuit 11 receives the signal to form an extension route comprising a handset 16 and the radio transmitter-receiver 15 and the extension communication between the master set and the radiotelephone set is applied. |
