| 摘要 |
PURPOSE:To improve the line in ineffective holding in response to an incoming call during waiting and to improve the incoming call service, by responding other incoming calls within a prescribed time, when the other incoming calls are given to an extension during call. CONSTITUTION:A central control section CCU transmits a signal of a time limit monitor timer start to a time limit monitor circuit of a trunk circuit during catching by an extension C through an information transmission line BUS A, and the circuit TC starts the monitor of a prescribed time. The CCU makes the trunk and the extension C to wait. When an extension A completes its call before the CCU receives a timeout signal and hooks on, the CCU a signal of time limit monitor release to the TC of the trunk via the path BUS A, stops the time monitor and connects the C to the A. Since the A receives a ringing signal, the response is done. When the A hooks off afterward, the extensions C and A enter the communication. |
