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

H - Electricity

04

M

344/0.5

H04M 1/66 (2006.01) H04M 3/38 (2006.01)

Patent

CA 1121925

KEY-2 -16- METHOD AND APPARATUS FOR DETECTING IRREGULAR TELEPHONE CALLS Abstract of the Disclosure 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.

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