| 摘要 |
PURPOSE:To simplify whether or not a caller is a desired calling terminal set and to confirm it without missing by storing identification information of the desired calling terminal set in advance and collating the identification information of an incoming caller with the stored identification information. CONSTITUTION:The arrival of sender terminal identification signal (TSI) from a caller terminal set is supervised and when the TSI comes, identification information from a memory 10 is read and the received identification information is collated with the identification information read from the memory 10. Then as the result of collation, when it is discriminated that both the identification information sets are coincident, it is discriminated that the incoming caller set is the desired terminal set and a ring tone generation command is outputted to a ring tone generating circuit 11. As a result, the occurrence of the incoming call from the desired caller terminals set is informed to the operator.
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