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Method and apparatus for a nation-wide cellular telephone network

  • US 5,799,249 A
  • Filed: 10/25/1995
  • Issued: 08/25/1998
  • Est. Priority Date: 01/27/1992
  • Status: Expired due to Term
First Claim
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1. A method of controlling access to cellular telephone systems, comprising:

  • establishing a voice channel between a telecommunications platform and a mobile unit by directing a call from the telecommunications platform to the mobile unit through a local cellular telephone system;

    performing a handshake protocol between the mobile unit and the telecommunications platform using the voice channel, the handshake protocol comprises generating a response at the telecommunications platform as a mathematical function of a challenge received at the telecommunications platform;

    communicating the response to the mobile unit; and

    providing voice communication using the previously established voice channel if the response is proper.

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