| 摘要 |
PURPOSE:To make sure the operation at incoming and outgoing call, by performing dial numeral display via the decoder circuit at outgoing call, deliverying the dial signal to the station of extension line, and by displaying the incoming number after detecing the incoming call and discriminating the station or extension line at incoming call. CONSTITUTION:When the telephone set is off-hook, the dial signal is written in the memory circuit 6 and it is code-converted with the push button dial operation and stored to the circuti 6, is dial-number-displayed 9 via the decoder circut 8, 16 and the dial signal is produced 14 with the operation of the dial signal selection switch 3 and it is delivered to the station or extension line. Next, at incoming call, it is detected with the incoming call detection circuit 17 and is controlled with the gate circuit 5 and it is discriminated 18 depending on the station or extension. As a result, the station or extension number generator 19 or 20 is driven, the incoming call number is written in, and it is displayed on th display unit 9. Thus, the misdialing prevention at outgoing call and sure operation at incoming call can be made. |
