Telephone message waiting system and apparatus

Details Telephone message waiting system and apparatus Telephone message waiting system and apparatus

1989-12-29

1990-11-06

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379201, 379418, 379253, H04M 342, H04M 100

Patent

active

049691864

ABSTRACT:
A system transmits information over telephone lines using ring signals. The ring signals have bursts of selectable duration separated by selectable time intervals between bursts. A ring signal translator receives the ring signals from telephone lines whereupon a computer activates selected indicators in response to the particular ring signal.

REFERENCES:
patent: 4477697 (1984-10-01), Judd et al.
patent: 4508937 (1985-04-01), Burger et al.
patent: 4670628 (1987-06-01), Boratgis et al.
patent: 4670900 (1987-06-01), Waldman
patent: 4701949 (1987-10-01), Lynch et al.
patent: 4747129 (1988-05-01), Ostrowiecki

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