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Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path

  • US 6,141,406 A
  • Filed: 05/30/1997
  • Issued: 10/31/2000
  • Est. Priority Date: 03/27/1997
  • Status: Expired due to Term
First Claim
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1. A method for detecting whether a remote party, using a remote telephone in telecommunication with a local telephone, has added a third party at a secondary telephone destination to said telecommunication comprising:

  • establishing a telephone connection between the local telephone and the remote telephone;

    identifying an echo characteristic to said telephone connection; and

    monitoring the echo characteristic for a significant change in the characteristic consistent with the addition of the secondary telephone destination by said remote party.

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