Pushbutton telephone set disabling means

Details Pushbutton telephone set disabling means Pushbutton telephone set disabling means

1980-01-03

1981-10-27

Brigance, Gerald L.

179189D, 179 18DA, H04M 166

Patent

active

042975344

ABSTRACT:
A telephone set which is being used as a pushbutton-type telephone is protected from unauthorized use by a frequency signal altering circuit restricting the output from a built-in TOUCH-TONE (R) signalling pad or other TOUCH-TONE (R) generator. The circuit includes at least one notch filter which, when electrically inserted between the telephone set and a call receiving station, alters at least one of those frequencies generated at the telephone set by pushbutton circuits to dial a number to a form which is not proper for actuating equipment at the call receiving station. The frequency signal altering circuit is located internal to or closely adjacent the telephone set to be protected. Circuits which restrict the output from a telephone are also disclosed.

REFERENCES:
patent: 4000380 (1976-12-01), Jackson
patent: 4012602 (1977-03-01), Jackson
patent: 4092500 (1978-05-01), Hughes
patent: 4099033 (1978-07-01), Murray

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