Alcatel Lucent

Newbridge Networks Corporation

Jim Hurd

Gerry R Dubois

Michael Jhu

Balachandar S Gettala

Henri R Vandette

Suryaram Alladi

Keith Allan

Michael Roberts

Glenn Arne Karlsen

James A Stanton, Jr

Rex Benning

Michael Jude Roberts

Gerry Dubois

Henri Vandette

According to at least one embodiment of the invention, a protocol for managing redundant signaling links to form a reliable signaling connection is provided. The protocol has an initialization phase, in which the availability of signaling links is determined and an available signaling link is selected and activated, followed by an operational phase in which the activated link is used for sending signaling messages for a higher-level protocol. During the operational phase both links are monitored for availability using a query and reply technique. Should either link fail, a status message is sent to the remaining available link along with an activity switchover being performed, as required, depending on whether the failed link was the active link. The higher-level protocol process running on the media gateway performs management of the links, and the media gateway controller operates as a slave, whereby it need not initiate nor control any of the activities for management of the signaling links, thereby reducing the processing burden placed upon it. However, optionally, a media gateway controller may request a link switchover, which may be used to support link maintenance activities or link congestion avoidance measures.

Method and apparatus for redundant signaling links

X.25 access to frame relay network

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Ottawa, Canada

Jim Hurd