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Method and apparatus for intercepting potentially fraudulent telephone calls

DC CAFC
  • US 5,809,125 A
  • Filed: 01/25/1994
  • Issued: 09/15/1998
  • Est. Priority Date: 07/09/1992
  • Status: Expired due to Term
First Claim
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1. Telecommunications apparatus for selectively preventing establishment of a telephone call to a telephone number having a central office exchange code, said telecommunications apparatus being capable of transmitting a dialing sequence which includes a first plurality of dialing signals, followed by a second plurality of dialing signals followed by a third plurality of dialing signals, said telecommunications apparatus comprising:

  • means for receiving said dialing sequence prior to receiving said central office exchange code;

    means for evaluating said third plurality of dialing signals and for preventing establishment of said telephone call if said evaluated third plurality of dialing signals are determined to a) be in a location in said dialing sequence to accomplish international dialing and b) be respective predetermined signals which are used for international dialing irrespective of said second plurality of dialing signals.

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