| 摘要 |
An office call state display system includes a telephone exchange, first and second subscriber exchanges, and a display unit. First subscriber terminals are connected to the telephone exchange. Second subscriber terminals are connected to the second subscriber exchange. The first subscriber exchange is connected to the telephone exchange. The display unit is connected to the telephone exchange to display the call state of the first subscriber terminal and call states indicating busy, idle, and unmounted states of the extension telephone numbers assigned to the second subscriber terminals. The telephone exchange includes a control unit for sending, through the first subscriber terminal, a call state request signal including the representative extension telephone number and extension telephone number group information of the second subscriber terminal whose call state is to be known, and controlling the display unit on the basis of the call state information from the second subscriber exchange. The second subscriber exchange includes a signal control unit for returning call state information indicating a call state of each of the second subscriber terminals to the telephone exchange through the first subscriber exchange in response to the call state request signal from the telephone exchange.
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