Blue-box fraud prevention

Details Blue-box fraud prevention Blue-box fraud prevention

1988-09-29

1989-12-05

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

Fraud or improper use mitigating or indication

379188, H04M 166

Patent

active

048857670

ABSTRACT:
Disclosed is a method and apparatus for detecting a fraudulent toll telephone call made by a device coupled to a telephone, which device can generate a single-frequency (SF) tone control signal and multi-frequency (MF) signals used in a toll telephone network. The method comprises the steps of, (a) identifying an off-hook condition on a toll analog SF trunk line by detecting loop current on the trunk, and (b) detecting on the trunk an SF tone control signal indicating an on hook condition, followed by a predetermined number of MF control signals. The fraudulent call can be cancelled by actuating a relay having contacts in at least one control lead of the SF trunk.

REFERENCES:
patent: 4001513 (1977-01-01), Naylor
patent: 4002848 (1977-01-01), Stein
patent: 4284851 (1981-08-01), Schweitzer et al.
"Beating the Blue-Box Bandits", by Marce Eleccion, IEEE Spectrum, Aug. 1972, pp. 52-58.

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