| 摘要 |
PURPOSE:To easily confirm a dial number corresponding to a trunk line under using by providing a telephone set that reads a dial number data corresponding to a trunk line interface from a memory in a call and displays the dial number. CONSTITUTION:When the display switching key of a key part is operated and the data is received, a central control unit 5 searches a data table and detects whether a telephone set 3 which calls by the trunk line has a display function or not. When the telephone set has the display function, the data table is searched and a corresponded dial number is read out to the trunk line on which the trunk line call is used and the data is sent out to the control part of the corresponding telephone set 3 and a prescribed elapsing time (for example, 4 second approximately) is confirmed by a timer. Also, while the dial number is displayed, the LED of the key part is turned on to show the displaying and therefore the central control unit 5 sends out the lightening display data of the LED. Thereby, the display of the dial number corresponding to the used trunk line is displayed on an LCD for the prescribed time. |
