| 摘要 |
PURPOSE:To enable to change the connection to a specific route at a low cost by use of a regular circuit, by providing a supervisory time before an originating subscriber is connected to the originating register and a dial tone is sent out, so that the originating subscriber can execute the operation such as hooking, etc. in said time. CONSTITUTION:When an originating subscriber EXT takes up a handset, it is connected to the originating register ORT, and the A relay is operated. In this case, for instance the timing of one second or so is taken, and when the EXT executes hooking at that time, the A relay is released once and is operated again. This information is transferred to the control unit by the scanner, the control unit receives this information, switches to a specific route, for instance, connection to the B board ATT, etc., and sends out a dial tone. Also, in case when the A relay has not been released during the timing, the control unit operates the T relay, and sends out a dial tone to the originating subscirber through the line link frame from the originating register ORT. |
