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Surveillance device detection with countermeasures

  • US 8,340,252 B2
  • Filed: 06/29/2009
  • Issued: 12/25/2012
  • Est. Priority Date: 06/27/2008
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting surveillance devices on a telephone line comprising:

  • a case having at least one line input, at least one line output, a communications output, and a controller;

    the controller having a central processing unit and a memory storage and configured to;

    (a) instruct a test signal to be transmitted to at least one user-selectable line;

    (b) compare a test signal response from one of the user-selectable lines with a baseline signal response;

    (c) report a change in the line state of one of the user-selectable lines when the difference between the test signal response and the baseline signal response exceeds a threshold; and

    (d) issue a countermeasure based upon countermeasure settings; and

    a switch matrix, the switch matrix configured to inject the test signal into the at least one of the user-selectable lines, break a connection with at least one of the user-selectable lines, extract the test signal response from at least one of the user-selectable lines, and terminate a connection with one of the user-selectable lines when the controller issues a termination command.

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