Battling illegal call operations with fraud management systems

Telcos have lost significant revenue from interconnection bypass, due mainly to increased use of GSM VoIP gateways, operating illegally in an office’s private automatic branch exchange (PABX).


This paper details the most common service usage characteristics that allow detection of GSM gateways. It will also describe some of the advanced methods of avoiding detection that are often used by illegal GSM gateway operators.

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