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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user3071284
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Lava
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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.
Liju Thomas
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