Key telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature

Patent

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Details

379166, H04M 172

Patent

active

047633549

ABSTRACT:
A key telephone system comprising a key service unit and a plurality of key telephone sets is configured by this invention so as to permit use of IC cards which are adapted to admit user data for registration therein, to be inserted in any of the key telephone sets for the user data to be read out of the IC card, and to enable the user to utilize the key telephone set.

REFERENCES:
patent: 4650932 (1987-03-01), Komuro et al.

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