Patents by Inventor David McGuigan

David McGuigan 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).

  • Publication number: 20080112327
    Abstract: A method for performing alternate and therefore least cost routing in distributed H.323 Voice over IP (VoIP) networks is provided. With this method, the VoIP network consists of a hierarchy of gatekeeper (GK) functions to provide alternate routing, network element redundancy, and scalability. The alternate routing function is performed by a directory gatekeeper with route selection advancing from a first route to a second route by either of two conditions: (1) there are no resources available to terminate the call in the first zone; and (2) a lack of response to the directory GK request for such resources.
    Type: Application
    Filed: January 21, 2008
    Publication date: May 15, 2008
    Applicant: LEVEL 3 COMMUNICATIONS, LLC
    Inventors: Harry Mussman, John McCabe, David McGuigan, Robert Israel, Eric Sporel