Unauthorized call defeat apparatus

Telephonic communications – Call or terminal access alarm or control – At substation

Patent

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Details

379216, 379283, 379442, H04M 166

Patent

active

060144351

ABSTRACT:
A call defeat device to prevent calling unauthorized numbers, such as long distance, 1-900 etc., which is adapted to prevent a caller from successfully dialing one or more predetermined digit strings on a touch tone telephone connected to a given telephone line by apparatus including a touch tone decoder coupled to the telephone line and a microprocessor/memory for storing and issuing predetermined unauthorized digit strings, if dialed on the telephone, designates that the call is to be defeated. A comparator compares each digit string dialed on the telephone to the predetermined digit strings, and, if a match is sensed, a dialer sends onto the telephone line at least one DTMF digit, such as a "#", which will defeat the call in progress. In a variant of the unauthorized call defeat apparatus, if an unauthorized digit string is dialed, a mode of operation can be selected in which an audio tone, falling outside the standard passbands of all tones representing dialed digits, is applied to the telephone line so as to "jam" and thus prevent any meaningful communication on the line. The invention can be implemented as a stand alone device or incorporated into a telephone.

REFERENCES:
patent: 4866762 (1989-09-01), Pintar
patent: 5590182 (1996-12-01), Stevens et al.

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