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Ti+  for  TS 23.502§
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5GS-S1. UE‑Triggered Service Request
9 of 38 
Signalling flow for TS 23.502 UE-Triggered Service Request: new UPF (intermediate) to SMF: N4 Session Establishment Response

Step 6b, verbatim
[Conditional] UPF (PSA) to SMF: N4 Session Modification Response.
The UPF (PSA) sends an N4 Session Establishment Response message to the SMF. If the UPF (PSA) allocates CN Tunnel Info of UPF (PSA), it provides CN Tunnel Info to the SMF. The UPF (PSA) associate the CN Tunnel Info with UL Packet detection rules provided by the SMF.