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Providing user notification signals in phones that use encryption

  • US 7,571,317 B1
  • Filed: 09/11/2002
  • Issued: 08/04/2009
  • Est. Priority Date: 09/11/2002
  • Status: Active Grant
First Claim
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1. A method of providing user notification signals in a digital phone that uses packetized voice communication, the method comprising the computer-implemented steps of:

  • receiving an encrypted voice data packet in the digital phone;

    in the digital phone, attempting to authenticate the voice data packet;

    determining in the digital phone whether the voice data packet was dropped by a routine executing in the digital phone;

    in response to determining in the digital phone that the voice data packet was dropped by the routine executing in the digital phone, determining in the digital phone whether a number of dropped voice data packets exceeds a specified number within a time period; and

    in response to determining in the digital phone that the number of dropped voice data packets exceeds the specified number within the time period, generating in the digital phone a user notification signal that is perceivable by a user of the phone.

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