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5GS – UE‑Triggered Service Request – 34 of 36
Signalling flow for TS 23.502 UE-Triggered Service Request: UPF (PSA) to SMF: N4 Session Modification Response


Step 21b, verbatim
[Conditional] UPF (PSA) to SMF: N4 Session Modification Response.
UPF (PSA) acting as N3 Terminating Point sends N4 Session Modification Response to SMF.