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5GS – UE‑Triggered Service Request – 33 of 36
Signalling flow for TS 23.502 UE-Triggered Service Request: SMF to UPF (PSA): N4 Session Modification Request

Step 21a, verbatim
[Conditional] SMF to UPF (PSA): N4 Session Modification Request.
If forwarding tunnel has been established to the UPF (PSA) and if the timer SMF set for forwarding tunnel at step 7a has expired, SMF sends N4 Session modification request to UPF (PSA) acting as N3 Terminating Point to release the forwarding tunnel.