3GPP 24.501 v20.0.0 — the document's own text
6.6.1 Exchange of extended protocol configuration options
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The UE and the SMF can exchange protocol configuration options via 5GSM procedures.
The protocol configuration options shall be exchanged via the Extended protocol configuration options IE.