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Telephone Calling Fraud
Kenneth C. Cox, Stephen G. Eick , Graham J. Wills
AT&T Bell Laboratories
Project Description:
Telecommunications fraud is an industry-wide problem. The percentage of fraudulent calls is small with respect to overall call volume, but the overall cost is significant; analysts estimate that industry losses to fraud in the U.S. alone amount to as much as $1 billion per year. The most significant areas of loss are in wireless and international calls, because they are the most expensive.

This diagram shows a NicheWorks display showing eight hours of international calling. The nodes represent the subscribers and the lines from the nodes to the countries encode the total number of calls. The large brightly colored nodes are unusual and further investigation revealed that some of them were involved in fraud.

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