Importance

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Abstract

A method, system and network node for identifying a call in a telecommunications system wherein the first identifier has been determined to be used on network interfaces for identifying the call in call messages associated with the call. In the method, to enable the call to be unambiguously identified in the whole network area, the network is divided into smaller sub-networks such that the first identifier used on the interface is unique in the sub-network area, a second identifier is determined to be used for identifying the call in the whole network area, one second identifier value is allocated to the call in connection with call setup, one or more fist value of the first identifier is allocated to the call in connection with call setup, each first identifier value is bound to a second identifier value, the second identifier value is replaced in the call messages with the first identifier value before the message is transmitted from the network via the interface, and the first identifier value received in the call messages via the interface is replaced with the second identifier value in the network.

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First Claim