Patents by Inventor David C. Harton

David C. Harton has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • System and method for providing a recovery mode in a session initiation protocol (SIP) environment
    Patent number: 8254552
    Abstract: A method to be executed in a session initiation protocol (SIP) environment is provided that includes detecting, by a first agent, a potential lost connection associated with a signaling path. The signaling path couples a first endpoint and a second endpoint and is operable to exchange signaling data. The potential lost connection is associated with a call between the first and the second endpoint, the first agent being associated with the first endpoint. The method also includes communicating a reinvite to a second agent that is associated with the second endpoint in order to determine whether the call between the first endpoint and the second endpoint is active.
    Type: Grant
    Filed: January 6, 2005
    Date of Patent: August 28, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: David C. Harton, Richard A. Frisk, Ho Bao, Clint D. Entrop