Method and apparatus for defeating a predictive telemarketing sy

Details Method and apparatus for defeating a predictive telemarketing sy Method and apparatus for defeating a predictive telemarketing sy

1997-06-18

1999-07-06

Le, N.

Telephonic communications

Supervisory or control line signaling

Substation originated

379353, H04M 100

Patent

active

059206233

ABSTRACT:
A method and apparatus for defeating a predictive dialing telemarketing system includes a signal generator in the nature of an oscillator (18) that is capable of creating a 914 Hz sine wave that substantially imitates the first tone of an intercept Special Information Tone used by the telephone network to indicate a nonworking number. The oscillator (18) is amplified with an amplifier (22). The imitation signal is selectively sent in response to the incoming call when a controller (12) closes a relay (20) to connect the imitation signal to the telephone line (16). The controller (12) is prompted to close the relay (20) by an off-hook detector (14) that indicates to the controller (12) when a voice signal is established.

REFERENCES:
patent: 4401860 (1983-08-01), Walls
patent: 4737720 (1988-04-01), Mills
patent: 4845743 (1989-07-01), Lutz
patent: 5259022 (1993-11-01), Kuok et al.
patent: 5721771 (1998-02-01), Higuchi et al.
patent: 5796816 (1998-08-01), Utsumi

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