Section: 19.4.2.9A ePDG FQDN for emergency bearer services 19.4.2.9A.1 General
Content: The ePDG FQDN used for the selection of an ePDG supporting emergency bearer services shall be constructed using one of the following formats, as specified in clause 4.5.4a of 3GPP TS 23.402[ Architecture enhancements for non-3GPP accesses ]  [68] and 3GPP TS 24.302[ Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks; Stage 3 ]  [77]: - an Operator Identifier based Emergency ePDG FQDN; - a Tracking/Location Area Identity based Emergency ePDG FQDN; - an Emergency ePDG FQDN configured in the UE by the HPLMN, which may have a different format than the one specified in the following clause. The Visited Country Emergency FQDN is used by a roaming UE, in the context of an emergency session, to determine whether the visited country mandates the selection of an ePDG in this country. The Visited Country Emergency FQDN shall be constructed as specified in clause 19.4.2.9A.4. The Replacement field used in DNS-based Discovery of regulatory requirements shall be constructed as specified in clause 19.4.2.9A.5. The Visited Country Emergency Numbers FQDN is used by a roaming UE to determine the list of emergency numbers and related emergency service types in the the visited country.