| 摘要 |
PURPOSE:To stop service power supply to the transmitter and receiver set of the branch board server to perform re-intervention, by depressing the key of the call park indicating monitor call service in the cordless board of the telephone exchange. CONSTITUTION:When the branch board server connects trunk TRK and extension subscriber's telephone set SUB and sets the state of tripartite call service to complete the connection operation, the key for monitor call set is depressed to discriminate a trunk memory, which is in the state of tripartite call service interposing the branch board, and set the trunk memory to the state of monitor call service in case that the connection call above is set to monitor call service. Next, for re-intervention, the call park key indicating monitor call service is depressed to retrieve a related trunk, and this trunk memory is set to the state of monitor call re-intervention. At this time, the branch board server becomes the state of monitor. Further, if the key for service is depressed under this state, the state is returned to the state of tripartite call service. |
