Telecommunications – Radiotelephone system – Security or fraud prevention
Patent
1997-02-28
1999-12-07
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Security or fraud prevention
379189, H04M 166
Patent
active
059998075
ABSTRACT:
A system for the authorization of wireless telephone communications establishes two sets of authorized telephone numbers. A first set of authorized telephone numbers are supplied by the customer, and the second set of authorized numbers are derived from customer bills paid by the customer. The system analyzes transmission characteristics from an unauthenticated cellular telephone and attempts to verify its authenticity based on the transmission characteristic by analyzing the transmission characteristic with respect to stored reference waveforms for the authentic wireless telephone. However, the results of this signature analysis if negative may be overridden if the telephone number dialed by the unauthenticated cellular telephone matches a telephone number in either the first or second sets of authorized telephone numbers. The system also includes a technique for modifying the reference waveforms to compensate for changes in the transmission characteristic. The system will only consider the inclusion of transmission characteristics from the present communication if the dialed digits for the present communication match one of the telephone numbers in either the first or second sets of authorized telephone numbers.
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Green Evan R.
Kaplan Dmitry
McKernan Randolph W.
Stanhope David M.
Wilburn Howard L.
Bhattacharya Sam
Cellular Technical Services Company, Inc.
Eisenzopf Reinhard J.
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