Importance

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Abstract

A method for preventing circular routing in a telecommunications network, particularly in a common channel signaling network, in which the availability of a particular route is notified by sending particular management message from a node to another. In this case, a node acting as a signal transfer point, sends to its adjacent nodes particular transfer-prohibited messages notifying the adjacent nodes that they must no longer route messages destined to the nodes mentioned in the transfer-prohibited messages via the node that send the transfer-prohibited messages. In order to prevent circular routing without unnecessarily making nodes inaccessible, (a) transfer-prohibited messages used only for preventing circular routing are made distinguishable from the first-described transfer-prohibited messages relating to a particular destination node, a node sends a corresponding message to the adjacent nodes via which it routes messages to that particular destination node, and (c) each node stores route-specific information on the type of the last transfer-prohibited message of either type received.

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First Claim