Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2001-04-06
2008-03-04
Pham, Chi (Department: 2616)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S230000, C370S237000, C370S395200, C370S468000
Reexamination Certificate
active
07339934
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.
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Israel Robert Kellar
McCabe John Joseph
McGuigan David Frederick
Mussman Harry Edward
Sporel Eric Richard
Hensley Kim & Holzer LLC
Level 3 Communications LLC
Mills Donald L
Pham Chi
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