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.

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.