| 摘要 |
PURPOSE:To obtain information concerning a calling subscriber in addition to main wire incoming before reply at the time of main wire incoming by providing a device that detects additional dial and storing information such as caller identification number, lamp number etc. in a memory. CONSTITUTION:When a main wire subscriber makes additional dialing of number related to the caller himself according to predetermined form, the additional dial information is sent to a central controlling unit 5 through an incoming register trunk 7. In the central controlling unit 5, this additional dial information is compared with caller identification number registered beforehand in a memory 6. If it is incoming from a registered caller, lamp number corresponding to the caller is determined. Basing on this, the central controlling unit 5 sends out lamp number information to a switch box 8 together with main wire incoming information. When the switch box 8 receives main wire incoming information and specified lamp number information, a lamp 10 for indicating main wire incoming is lit up, and at the same time, corresponding specified individual display lamps L1-L15 are lit up, and an operator of the switch box 8 is informed of main wire incoming and information related to the caller. |
