Detection of cloned communication units based on message...

Telecommunications – Radiotelephone system – Security or fraud prevention

Reexamination Certificate

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C380S247000, C340S005800

Reexamination Certificate

active

06999751

ABSTRACT:
A method (FIG.3), corresponding call screening unit, and base station (FIG.2), suitable for detecting cloned communication units (111or113), are operable to receive a first response message and a second response message (305); determine whether identification fields (ESNs, MINs) corresponding to the response messages are equivalent (307); and if so, assess whether message contents or message properties corresponding to the response messages are not correlated (311) thus indicating the response messages are from different communication units; and when not correlated, decide that one of the response messages corresponds to a cloned communication unit (313).

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