| 摘要 |
PURPOSE:To inspect 2 party subscriber circuits in a subscriber without remodeling a switchboard at all, by providing an originating number and call signal inspecting device on the outside of the switchboard. CONSTITUTION:A central control device CC recognizes an originating party SUB-B from a subscriber's circuit LC, and connects the party SUB-B of 2 party lines to an originating trunk ORT. When a 2 party circuit inspecting number IXY is received in the originating trunk ORT, the device CC sends out the 2 party subscriber circuit inspecting number and an originating number of the party SUB-B of 2 party lines, to an originating number and call inspecting device NRVE from an outgoing sender trunk OST. When the inspecting number and the originating number of the party SUB-B are received, the device NRVE discriminates them by a control device CONT, and returns them, informing that your number is N1N2N3, from an audio response device ARU. |
