Telecommunications – Radiotelephone system – Security or fraud prevention
Patent
1996-05-22
1999-05-04
Vo, Nguyen
Telecommunications
Radiotelephone system
Security or fraud prevention
455 671, 375340, H04M 166
Patent
active
059013516
ABSTRACT:
A method and apparatus for fraud detection is provided in which a remote unit within a communication system (100) transmits a Digital Supervisory Audio Tone (DSAT) at a transmission rate with a known maximum phase shift over time. When a fraudulent remote unit hijacks a traffic channel within the communication system (100), fraud detection is accomplished by calculating a maximum permitted (DSAT) phase shift (630) and determining if the reacquired DSAT has a phase shift greater than a permitted DSAT phase shift (635). When a reacquired remote unit's DSAT phase shift is greater than a permitted DSAT phase shift, appropriate fraud control methods are performed (640).
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Bhattacharya Sam
Haas Kenneth A.
Motorola Inc.
Sonnentag Richard A.
Vo Nguyen
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