| 摘要 |
PROBLEM TO BE SOLVED: To provide a telephone system capable of notifying terminals of participation members under group call where one terminal is about to be disconnected during the group call, and capable of eliminating omission of information transmission. SOLUTION: Disclosed is the telephone system which includes a notification section 13 for outputting a voice message indicating that the specified terminal is about to be disconnected to a control unit 1, wherein the control unit 11 monitors signal reception by a group call trunk 12 from respective members during the group call, instructs the notification section 13 to output the voice message, indicating that the terminal as the member is about to be disconnected, when the group call trunk 12 receives a signal on the information of electric field strength from the member, and outputs the voice message to all the members, via the group call trunk 12. COPYRIGHT: (C)2008,JPO&INPIT
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