Patent ID: 6947532

Claim:
A system for identifying fraud in a telecommunications system, the system comprising at least one processor, memory and related software, the at least one processor receiving data related to a current call placed from an originating automatic number indicator (ANI), the received data including at least the originating ANI, a billing number and an identification code, the processor retrieving a threshold number and a time interval corresponding to the identification code from the memory, the processor also retrieving from memory billing numbers for prior calls from the originating ANI, if any, and an indicia of the time of the call, and the processor also determining whether the number of different billing numbers used for the current and prior calls from the originating ANI over a prior period of time equal to or less than the time interval exceeds the threshold number, wherein the prior period of time spans from the time of the current call backwards in time equal to the time interval for the identification code, the processor counting the number of different billing numbers for the current call and all prior calls for the originating ANI that fall within the prior period of time, a fraud alert being generated if the threshold number is exceeded.