When are these diameter errors are triggered?

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Can you give examples of when these diameter errors are triggered by the diameter server?

Error_User_Unknown(5001) and Unknown_Session_ID (5002) in the LTE world

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According to the specifications 5001 and 5002 occurs when IMSI and session ID are not found in the database.

There can be many scenarios when this can happen:

  • IMSI has deregistered or move to some other HSS or you receive the message because of error in the peer node.

  • Session terminated and you receive the message thereafter.