Call waiting notifying apparatus

Details Call waiting notifying apparatus Call waiting notifying apparatus

1997-10-24

1999-01-05

Loomis, Paul

Telephonic communications

Multi-line or key substation system with selective switching...

With special service

379261, 379215, 370270, 370271, H04M 100, H04M 342, H04J 312

Patent

active

058570179

ABSTRACT:
A call waiting notifying apparatus including a discriminating circuit to discriminate to see if a call reception has been generated from a digital line to an analog terminal in communication or not; and a transmitting circuit to transmit a predetermined tone to the analog terminal if the generation of the call waiting is determined by the discriminating circuit. The discriminating circuit discriminates the generation of the call waiting on the basis of a command received through a control channel of the digital line.

REFERENCES:
patent: 4581733 (1986-04-01), Sarson et al.
patent: 4873719 (1989-10-01), Reese
patent: 4899358 (1990-02-01), Blakley
patent: 4937856 (1990-06-01), Natarajan
patent: 4975944 (1990-12-01), Cho
patent: 5128989 (1992-07-01), Nomura
patent: 5195131 (1993-03-01), Sano

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