| 摘要 |
PURPOSE:To prevent the incoming release by erroneous operations by providing an incoming release means which is provided on a slave set and release the incoming state of the slave set and a release invalidating control means invalidating the release operation from the incoming release means for prescribed time after the slave set receives an incoming call. CONSTITUTION:An incoming call response is performed by depressing a line wire button 1 when an originating call is from a line wire and depressing an extension button 2 when the call is from an extension. When the call is received, a control part 21 detects the effect, a release invalidating control means 22 operates, it invalidates the incoming release operation by the line wire button 1 or the extension button 2, a timer 23 operates, it counts for only preliminarily set time and the release invalidating control means 22 operates for the time. Namely, the release invalidating control means 22 operates for only preliminarily set time after the incoming call is received and the incoming call is not released even if the line wire button 1 or the extension button 2 is depressed during the time. Therefore, even if the line wire button 1 or the extension button 2 is erroneously depressed twice at the time of the incoming call response, the incoming call is not released. |
