| 摘要 |
PURPOSE:To call a caller telephone set after the end of talking by allowing a master set to store a number of the caller telephone set and an ID code of a called slave set when the slave set is busy and sending the code to the slave set. CONSTITUTION:Suppose that a slave set 21 is called by, e.g. a telephone set 5 when the slave set 21 is busy, a busy pseudo tone signal is sent to the caller telephone set 5 and when the telephone number is inputted by the operator of the telephone set 5 succeedingly, the telephone number is sent to the master set 1 via a wired line 3 and the master set 1 stores the telephone number (extension number) and the ID code tentatively. When the talking is terminated, the slave set 21 sends a call termination signal to the master set 1, a registration telephone number is displayed on a display section 7 in this case and the call of the telephone set 5 of the telephone number is implemented automatically. Thus, the slave set calls back the caller telephone set after the end of talking. |
