Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent
1990-06-20
1991-12-17
Schreyer, Stafford D.
Telephonic communications
Multi-line or key substation system with selective switching...
Line status indication or call alerting
379173, 379373, H04M 342, H04M 172
Patent
active
050739220
ABSTRACT:
A communication terminal apparatus is used in a network system in which a sub address is affixed to a subscriber apparatuses from each other. A proper incoming call indicating tone is registered beforehand in correspondence with a sub address, and an incoming call indicating tone which has been registered in accordance with the sub address is output when a terminating call is received. In consequence, a called terminal can be discriminated by the incoming call indicating tone. Further, a desired incoming call terminating tone can be heard.
REFERENCES:
patent: 4782518 (1988-11-01), Mattley et al.
Canon Kabushiki Kaisha
Schreyer Stafford D.
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