The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 2015
Filed:
May. 17, 2010
David Frederick Mcguigan, Sudbury, MA (US);
Harry Edward Mussman, Bedford, MA (US);
John Joseph Mccabe, Billerica, MA (US);
Robert Kellar Israel, Westford, MA (US);
Eric Richard Sporel, Marlborough, MA (US);
David Frederick McGuigan, Sudbury, MA (US);
Harry Edward Mussman, Bedford, MA (US);
John Joseph McCabe, Billerica, MA (US);
Robert Kellar Israel, Westford, MA (US);
Eric Richard Sporel, Marlborough, MA (US);
Level 3 Communications, LLC, Broomfield, CO (US);
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.