| 摘要 |
PROBLEM TO BE SOLVED: To significantly reduce a mental burden on a called-side user in responding to a group incoming call.SOLUTION: An incoming call control section 14A notifies a designated individual call incoming destination extension terminal 20A of an individual incoming call in response to an incoming call designating any one of extension terminals 20. When there is no response to the individual incoming call even after the lapse of a call time from the notification of the individual incoming call, a group incoming call destination extension terminal 20 composed of an extension terminal 20 belonging to the same terminal group as the individual incoming call destination extension terminal 20 is notified of a group incoming call. When notifying the group incoming call destination extension terminal 20 of the group incoming call, individual incoming call destination information indicating the individual incoming call destination extension terminal 20 is reported, and the individual incoming call destination information is reported together with the group incoming call in the group incoming call destination extension terminal. |
