| 摘要 |
A method, system and network element for tracing signalling messages related to a subscriber in a mobile communication system. In the solution according to the invention a functional entity of the mobile communication system receives a trace command (3-1) which indicates the tracer and identifies at least one subscriber whose signalling messages are to be traced, and tracing is started, tracing comprising the steps of: copying the signalling message in response to reception or transmission of a signalling message related to the subscriber to be traced, and sending a copy to the tracer (3-2').
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