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    • 8. 发明申请
    • A METHOD AND SYSTEM FOR PREVENTING NETWORK ORIGINATED FRAUD
    • WO2022173408A2
    • 2022-08-18
    • PCT/TR2022/050124
    • 2022-02-15
    • TURKCELL TEKNOLOJI ARASTIRMA VE GELISTIRME ANONIM SIRKETI
    • KOKSAL, Bulent
    • H04M15/00H04L9/40
    • The present invention relates to a method and system for preventing Network Originated Fraud on the telecommunication ON (10) (Operation Network), by using the source calls. In Network Originated Fraud, the FUs (30) (Fraud Unit) make ON (10) originated international calls to the international foreign numbers, by exploiting long-distance calling tariffs of the ONs (10). The FUs (30) carry transit international calls as the ON (10) originated international calls. Fraud numbers such as "SIM Box" numbers that are exploited by the FUs (30) are detected and blocked. Source calls may be the real calls from real subscribers or the test calls that make a call to the real subscriber numbers. A CU (11) (Control Unit) is triggered for real calls from the FNs (22) (Foreign Networks). These real calls are the calls from real subscribers of the FNs (22) all over the world. The CU (11) generates the test calls. Originating international calls of the ON (10) are controlled by the CU (11); the CSNs (Calling Subscriber Number) related to the source calls are controlled throughout the source calls by the CU (11). The CU (11) determines the terminated calls of the source calls by originating international calls, that it associates to the CSN. The CU (11) detects the terminated calls as Network Originated Fraud and blocks CNI (Calling Number Information) related to these terminated calls.