Toll-call restriction system

Details Toll-call restriction system Toll-call restriction system

1976-11-18

1978-06-20

Cooper, William C.

H04M 166

Patent

active

040963578

ABSTRACT:
Apparatus for enabling a user to selectively defeat the toll-call restriction system. The apparatus is comprised of means for applying a tone to the telephone lines through the calling telephone mouthpiece. Detection means responsive to the tone sets a flip flop which functions to inhibit the activation of a relay normally used to disrupt the connection between the calling phone and telephone lines when an unpermitted telephone number is dialed.

REFERENCES:
patent: 3920936 (1975-11-01), Mogtader
patent: 3953680 (1976-04-01), Zimmermann

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