PDU session release request sent by the UE

Hi experts

I am trying to test on SA , but just after the pdu session establishment accept sent by NW the UE send pdu session release request cause 31 (request rejected, unspecified)
Please let me know why this is happening knowing that PDU session accept sent by NW seems to be correct

UE may request DNN=IMS where IMS is not available.
From 5GCN, UE should config for IMS QoS.

1 Like

No actually the UE is pushing default DNN (internet)

I resolved the issue , it was the MTU containers in the pdu session establishment accept :
Container 0: 37
Container 1:128

Which means that MTU was set to 9600
I set it back to 9000 (jumbo frame).