Section: 4.11.4.3.7 5GC NAS capability (re-)enabled and disabled
Content: When 5G NAS (i.e. N1 mode) capability is (re-)enabled, the UE does not report the UE capability change to ePDG. NOTE: The ePDG is not aware of the N1 mode Enabled / Disabled status at the UE. If a standalone PGW was previously selected, the ePDG is not able to initiate PDN disconnection with reactivation required for the purpose of re-selecting an SMF+PGW-C. When N1 is re-enabled, how to handle PDN connection(s) established over EPC/ePDG and without a mapped S-NSSAI is defined in TS 24.501[ Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3 ]  [25].