| 摘要 |
A method and apparatus are provided to control a subscriber's phone system including, at least, one automatic telephone answering equipment. When a calling party dials the phone number of a subscriber whom he desires to call, the apparatus of this present invention shall close the d.c. loop, in response to which the calling party receives a ring-back signal. If the calling party does not send a pre-established code after receiving the ring-back signal, and after a predetermined period of time has elapsed, the phone line shall be automatically connected by this invention apparatus to the automatic phone answering equipment. But if he dials a pre-established code after the d.c. loop closes, the code shall be displayed on a displaying device, and at the same time an acoustic signal source will be activated advising the called party that he is receiving a call from someone who knows the preset code. By looking at the displaying device, the called party is able to recognize the code, thus enabling him to answer or not the call. If he attends the call, the automatic answering equipment shall not be connected to the phone line; but instead the called party phone set shall be connected, thus allowing him to answer the call in a normal mode. If he does not or cannot attend the call, for example for being absent, then after a certain period of time has elapsed, the automatic phone answering equipment shall be connected to the phone line.
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