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Ti+  for  TS 23.502§4.2.3.2
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5GS-S1. UE‑Triggered Service Request
39 of 38 
Signalling flow for TS 23.502 UE-Triggered Service Request: Old intermediate UPF to SMF: N4 Session Modification Response or N4 Session Release Response


Step 22b, verbatim
Old intermediate UPF to SMF: N4 Session Modification Response or N4 Session Release Response.
The old UPF acknowledges with an N4 Session Modification Response or N4 Session Release Response message to confirm the modification or release of resources.