| 摘要 |
PURPOSE:To attain direct reply to an incoming call from a specific line by controlling the incoming display to a specific single telephone set so as to give it to an incoming call only for a specific external line. CONSTITUTION:When an incoming call comes to a line 4, a central control section 7 recognizes the incoming call and sends a signal to a key telephone set control section 8. Thus, the key telephone set control section 8 sends the data signal to a key telephone set 2 to display the incoming call by means of light such as a lamp. On the other hand, a call signal of a line is sent directly or a signal from a central control section 7 activates a ring tone signal generating section 9 and sends a ring tone to a single telephone set 3. When a prescribed time is elapsed after the detection of the incoming call, the signal from the central control section 7 is used to apply incoming display by light on the key telephone set 2 and a call tone. Thus, the incoming call to a specific line is subject to incoming display by sound by the specific single telephone set and replied directly without holding or transfer to the incoming call. |
