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5GS – UE‑Triggered Service Request – 13 of 36
Signalling flow for TS 23.502 UE-Triggered Service Request: old UPF (intermediate) to SMF: N4 Session Modification Response


Step 8b, verbatim
old UPF (intermediate) to SMF: N4 Session Modification Response
The old (intermediate) UPF sends N4 Session Modification Response message to SMF.