Telephone call restriction apparatus

Details Telephone call restriction apparatus Telephone call restriction apparatus

1980-04-02

1982-08-24

Brown, Thomas W.

H04M 166

Patent

active

043462642

ABSTRACT:
A telephone call restrictor which is suitable for use in a PABX installation with pulse dial telephones includes a load which may be selectively connectable across the central office lines so as to inhibit reception of pulse signals by the central office when connected. The restrictor includes a detector which provides an output to disconnect the load upon receipt of an access code dialed at the telephone. The restrictor will normally include a prohibited number detector which will be disabled by the output from the access code detector.

REFERENCES:
patent: 3860763 (1975-01-01), Sudoh et al.
patent: 3873781 (1975-03-01), Nissim
patent: 3936617 (1976-02-01), Bolgiano
patent: 3992588 (1976-11-01), Hunsicker
patent: 4099033 (1978-07-01), Murray
patent: 4188508 (1980-02-01), Rogers et al.
patent: 4234764 (1980-11-01), Beebe
patent: 4251692 (1981-02-01), Waldman

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