| 摘要 |
A remotely controllable alarm system adapted to be connected to a telephone line comprises a memory for storing at least one authorized telephone number, a caller ID decoder for determining the source telephone number of an incoming call, a controller connected to the memory and to the caller ID decoder for comparing the source telephone number to the at least one authorized telephone number and answering the incoming call, and allowing remote access to the alarm system, if there is a match. Thus, the alarm system precludes access upon receiving an unknown number.
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