Method and apparatus for detecting irregular telephone calls

Details Method and apparatus for detecting irregular telephone calls Method and apparatus for detecting irregular telephone calls

1978-09-26

1980-01-08

Brigance, Gerald

179 18DA, 1791752R, H04M 1512, H04M 166

Patent

active

041829344

ABSTRACT:
Certain telephone calls cannot be billed properly due to the failure to detect a valid answer signal from the called customer. This disclosure presents an arrangement for detecting irregular calls that are recognized initially by a momentary off-hook signal from the called end of the trunk which is not quickly followed by a release of the trunk. When a momentary off-hook signal is received, the holding time of the trunk is measured. If the holding time exceeds a predetermined threshold a record is made of the lines connected to the trunk.
The calls are also categorized by called destination to detect fraudulent calls which are frequently directed to selected destinations.

REFERENCES:
patent: 3883702 (1975-05-01), Zarouni
patent: 3928803 (1975-12-01), Hugon et al.
patent: 4001513 (1977-01-01), Naylor
patent: 4002848 (1977-01-01), Stein
patent: 4046962 (1977-09-01), Rogers
"Beating the Blue Box Bandits," IEEE Spectrum, vol. 9, No. 8, Aug., 1972, pp. 52-58, Marce Eleccion.

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