| 摘要 |
PURPOSE:To make it possible to transmit various information to a called subscriber before the called subscriber answers, by making it possible to transmit different kinds of call signals to the called subscriber according to the dialing of a special number, etc., by a calling subscriber. CONSTITUTION:As calling subscriber 14 dials, the calling subscriber is connected to originating register trunk ORT8. Then, calling subscriber 14, once dialing a special number and the extension number of called subscriber 16, an exchange performs switching operation, but called subscriber 16 is connected not to call signal trunk 12-1, but to the call signal trunk selected corresponding to the special number. Since call signal trunks 12-1-12-4 have different kinds of call signals, one of call signals is sent to called subscriber 16 corresponding to he special number the calling subscriber has dialed. |
