Key set toll restrictor

Details Key set toll restrictor Key set toll restrictor

1980-04-02

1982-02-02

Brown, Thomas W.

179 18DA, H04M 166

Patent

active

043141080

ABSTRACT:
In a telephone restriction system having circuitry to interrupt the dialing sequence upon detection of a prohibited number, the improvement permitting the restriction system to be disabled by dialing an access code using a standard key set. An access code detector provides an output upon recognition of the access code; this output is used to disable the restriction system including the reset system normally associated therewith for a predetermined period of time to permit the central office line to be released and re-engaged so as to clear the access code therefrom.

REFERENCES:
patent: 3860763 (1975-01-01), Sudoh et al.
patent: 3873781 (1975-03-01), Nissim
patent: 3936617 (1976-02-01), Bolgiano
patent: 4096357 (1978-06-01), Mogtader
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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