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

4.3.5.2 Roaming architectures

Taught in 19. Living next to 4G (The 5G system architecture, in depth), 7. Roaming, other accesses, the edge and the outside (The 5G system architecture, overview).

Figure 4.3.5.2-1 represents the roaming architecture for Service Exposure for EPC-5GC Interworking. This architecture is applicable to both the home routed roaming and local breakout roaming.

Figure 4.3.5.2-1: Roaming Service Exposure Architecture for EPC-5GC Interworking

NOTE: Figure 4.3.5.2-1 does not include all the interfaces and network elements or network functions that may be connected to SCEF+NEF.