Section: 4.3.4.1 Non-roaming architecture
Content: Figure 4.3.4.1-1 represents the non-roaming architecture for interworking between ePDG/EPC and 5GS. Figure 4.3.4.1-1: Non-roaming architecture for interworking between ePDG/EPC and 5GS NOTE 1: The details of the interfaces between the UE and the ePDG, and between EPC nodes (i.e. SWm, SWx, S2b and S6b), are documented in TS 23.402[ Architecture enhancements for non-3GPP accesses ]  [43]. NOTE 2: Interworking with ePDG is only supported with GTP based S2b. S6b interface is optional (see clause 4.11.4.3.6 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]).