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Pay station telephone call answer supervision apparatus

  • US 4,916,733 A
  • Filed: 06/22/1988
  • Issued: 04/10/1990
  • Est. Priority Date: 09/29/1986
  • Status: Expired due to Fees
First Claim
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1. Apparatus for providing call answer supervision for controlling the charges to the user of a pay station telephone, comprising:

  • means for sensing the duration of audio signals on a telephone line connected to the pay station telephone after the completion of dialing by the user;

    means for detecting the longest sensed duration audio signal;

    means responsive to said detecting means for generating an identification signal representative of said longest sensed audio signal; and

    means responsive to said identification signal for controlling the charges to the user of the pay station telephone.

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