| 摘要 |
PURPOSE:To enable to detect newly a called subscriber number, without requiring the cable and pulse transmission, by providing a memory device having an area storing telephone number corresponding to an outgoing trunk caught by subscribers. CONSTITUTION:A number detector IDE in a memory unit MM is provided with a scanner SCN picking up callout subscriber number from the marker and the area storing the telephone number corresponding to the outgoing trunk caught by the subscriber, and the central processor CC controls the calling subscriber number detector OS. Further, when main channel is established, the outgoing trunk OGT catches the device IDE via the side link SL. When this device IDE recognizes the catching of the outgoing trunk, the information of outgoing subscriber is picked up from the storage area corresponding to the outgoing trunk OGT at the device MM, it is interpreted into required outgoing telephone number, and the result is transmitted to the signal transmitter OS. Thus, the calling subscriber number is detected newly without requiring the cable and pulse transmission. |
