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Ti+  for  TS 23.502§4.2.3.2
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5GS-S1. UE‑Triggered Service Request
37 of 38 
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.