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System and method of detecting and preventing fraudulent telephone calls in a radio telecommunications network

  • US 5,970,404 A
  • Filed: 10/25/1996
  • Issued: 10/19/1999
  • Est. Priority Date: 10/25/1996
  • Status: Expired due to Fees
First Claim
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1. A method of detecting a fraudulent call origination in a radio telecommunications network having a subscriber'"'"'s home Home Location Register (HLR) for storing an activity status indication for the subscriber'"'"'s mobile station, and a serving Mobile Switching Center (MSC) in which said call origination is initiated, said method comprising the steps of:

  • sending a reporting message from said serving MSC to said home HLR when a call is originated from said mobile station in said serving MSC;

    determining whether said stored activity status indication is busy; and

    determining that said call origination is fraudulent upon determining that said stored activity status indication is busy.

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