| 摘要 |
PROBLEM TO BE SOLVED: To obtain a telephone control system in which a caller number ID adaptor is easily extendable, even when for the existing system. SOLUTION: Plural exclusive extension terminal devices C1-Cn in the telephone control system, having no caller number ID display function connect to an extension bus line of a master set A containing at least one telephone line in this telephone control system. Furthermore, the telephone control system is configured of a caller number ID adaptor D to receive a caller number ID service, a telephone set with a caller number ID display function corresponding to the Number Display (registered trademark) service, and an ID adaptor connection adaptor B to connect the telephone set to the caller number ID adaptor D. Through this configuration, the caller number ID display function provided newly is easily added to the conventional existing telephone control system, without the need for additional wiring work.
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