Rerouting in a distributed telecommunication system

Details Rerouting in a distributed telecommunication system Rerouting in a distributed telecommunication system

H - Electricity

04

Q

H04Q 3/42 (2006.01) H04Q 3/00 (2006.01) H04M 3/54 (2006.01)

Patent

CA 2081168

Routing calls using a new protocol message which is a redirect message in a telecommunication system having a number of switching nodes to avoid circular paths among the switching nodes and for rerouting calls in the event of failures or overload conditions. During the establishment of a call from an originating switching node to a destination switching node where the call path has already been setup from the originating switching node through an intermediate switching node, a switching node is responsive to a setup message from the intermediate switching node requesting extension of the call path through the switching node to determine if such an extension would create a circular path. If circular path would be created, the switching node redirects the call (by using the redirect message) back to the intermediate switching node and indicates in that message to which switching node the call path should be extended. In response to the redirect message, the intermediate switching node reroutes the call path. Further, the redirect message entirely removes the call path between the switching node and intermediate switching node.

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