| 摘要 |
A telephone system that allows multiplexing and demultiplexing plural group calls through simple operations is provided. The telephone system includes a conference trunk creating unit that creates a conference trunk as required and has a multiplexing/demultiplexing special number table prestoring a multiplexing special number and demultiplexing special number corresponding to plural group calls. After plural group calls start, if the multiplexing special number is input, a control unit causes the conference trunk creating unit to create a large-conference trunk, switches and connects the voices of plural group calls corresponding to the multiplexing special number to the large-conference trunk and starts the multiplexed group call. If the demultiplexing special number is input, the control unit causes the conference trunk creating unit to create plural small-conference trunks, connects and switches each group call corresponding to the demultiplexing special number to the small-conference trunk and starts the demultiplexed group calls.
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