PDU Session Modification Reject
If the SMF does not accept the request to modify the PDU session, it sets the 5GSM cause IE of the PDU Session Modification Reject message to indicate the reason for rejecting the PDU session modification procedure.
The following table describes the supported 5GSM causes in the PDU Session Modification Reject message.
5GSM Reject Cause |
SMF Behavior |
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Cause #43 – Invalid PDU session identity |
The SMF sends this cause when SMF does not have the session. |
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Protocol errors |
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Cause #95 – Semantically incorrect message |
This 5GSM cause reports receipt of a message with semantically incorrect content.
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