| 摘要 |
PURPOSE:To directly connect a trunk line incoming call to a large number of extensions by providing connection system classification accommodating memories corresponding to each route of trunk line in a main memory device, and connecting a trunk line to an extension corresponding to a dialed number at the time when there is an incoming call to the trunk line. CONSTITUTION:At the time when there is an incoming call to a trunk line 110, a central control unit 109 refers to the connection system classification accommodating memory 113 corresponding to the routes in the main memory device 111 in accordance with a received information. In the result of the referring, if the connection system classification is a connection through an attendance board, the unit 109 executes the processing of trunk line incoming call to a trunk line attendant board 105. In case of a trunk line incoming call connection system, the unit 109 activates an announce machine 102 out to a talky trunk 101. Thus, prerecorded its own station name, several kinds of services, and numbers corresponding to the names of services are announced and informs them to trunk line subscriber's side through the office trunk line 110. In such a way, a trunk line incoming call can be directly connected to either one of a number of extensions without routing through the trunk attendant board. 101: talky trunk, 103: PB register trunk, 104: repeater interface circuit, 106: line control circuit, 107: extension subscriber, 100: time division switch, 108: interface circuit.
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