3GPP 23.501 v20.2.0 — the document's own text

5.6.10.1 Support of IP PDU Session type

Taught in 12. The connection to a data network (The 5G system architecture, in depth), 5. The connection, and what is promised on it (The 5G system architecture, overview).

The IP address allocation is defined in clause 5.8.1

The UE may acquire following configuration information from the SMF, during the lifetime of a PDU Session:

Address(es) of P-CSCF(s);
Address(es) of DNS server(s).
If the UE indicates support of DNS with security as defined in TS 33.501 [29] to the network in PCO and the network wants to enforce the use of DNS with security, the configuration information sent by the SMF via PCO may also include the corresponding DNS server security information as specified in TS 24.501 [47] and TS 33.501 [29].
the GPSI of the UE.

The UE may acquire from the SMF, at PDU Session Establishment, the MTU that the UE shall consider, see clause 5.6.10.4.

The UE may provide following information to the SMF during the lifetime of a PDU Session:

an indication of the support of P-CSCF re-selection based on procedures specified in TS 24.229 [62] (clauses B.2.2.1C and L.2.2.1C).
PS data off status of the UE.

NOTE 2: An operator can deploy NAT functionality in the network; a UPF supporting NAT information exposure functionality can register this capability with the NRF and the UPF can expose mapping between public and private IP addresses.