| 摘要 |
PROBLEM TO BE SOLVED: To extend a time when a speech communication path is disconnected even without performing a key operation input for displaying "extension" and for adding "extension" by an indoor terminal. SOLUTION: An interphone system is provided with an outdoor terminal 1 and the indoor terminal 2, starts a timer part 24 in the case of forming a speech communication path between the outdoor terminal 1 and the indoor terminal 2 and disconnects the speech communication path when a fixed time has elapsed since the timer part 24 is started. In the interphones system, when speech communication is held within a fixed period of time, a time when the speech communication path is disconnected is extended. COPYRIGHT: (C)2004,JPO
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