Method and system for controlling scam phone calls

A system for fighting a phone fraud comprising the making of a phone call, called soliciting call, soliciting a return phone call to a phone number, called target number, said system comprising:

• a network signalling data collecting device for collecting data signalling phone calls made via a telephone network of a telephone operator, and
• software and/or hardware means for:
• collecting data signalling phone calls made via a telephone network of a telephone operator;
• detecting suspicious phone calls from collected signalling data and using at least one detection algorithm, and for each detected suspicious phone call, identifying and storing a phone number, called suspicious number, to which said phone call is suspected to fraudulently solicit a return phone call to be made;
• comparing said suspicious number with at least one phone number and/or at least one range of phone numbers, called certified target numbers, contained in a certification database;
• defining for said suspicious number a different risk profile according to whether said suspicious number corresponds or not to a certified target number and/or to a number belonging to a range of certified target numbers contained in said certification database;
• building a list of premium-rate phone numbers and/or ranges of premium-rate phone numbers;
• comparing said suspicious number with at least one premium-rate number and/or matching a suspicious number with at least one range of premium-rate numbers;
• and
• modifying the risk profile of said suspicious number according to whether said suspicious number corresponds or not to a premium-rate number and/or to a number belonging to a range of premium-rate numbers.