System for controlling the transmission of specific dial numbers

Details System for controlling the transmission of specific dial numbers System for controlling the transmission of specific dial numbers

1979-02-27

1981-01-20

Brown, Thomas W.

H04M 166

Patent

active

042464455

ABSTRACT:
A control system is disclosed wherein the dialing of a specific number as the first digit is prevented. The system comprises a dial tone detector which detects a dial tone sent from a telephone exchange to a telephone set when a call is originated from the telephone set by off-hooking its handset, a dial pulse counter for sequentially counting the number of the dial pulses detected by the dial pulse detector, and circuitry responsive to signals from the dial tone detector and dial pulse counter for interrupting the loop if a number is dialed before reception of a dial tone. Additionally, when the output of the counter corresponds to the forbidden number, a talking or speech interruption control unit is operated to interrupt the talking or speech loop.

REFERENCES:
patent: 3798381 (1974-03-01), Piacente et al.
patent: 3899640 (1975-08-01), Piacente et al.

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