Telephone toll restrictor

Details Telephone toll restrictor Telephone toll restrictor

H - Electricity

04

M

379/26, 379/73

H04M 1/30 (2006.01) H04M 1/677 (2006.01)

Patent

CA 1119328

ABSTRACT OF THE DISCLOSURE An improved telephone toll restrictor utilizing both current and voltage sensors having substantially infinite input impedance during the on-hook condition. A timing circuit is provided to restrict calls a predetermined after a digit is dialed but prior to central office timeout. Furthermore, a pulse generator provides a strobe pulse to a coincidence gate which also responds to a digit pulse counter, for avoiding restriction of a digit which should not be restricted.

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