Section: 19.4.2.9 ePDG FQDN and Visited Country FQDN for non-emergency bearer services 19.4.2.9.1 General
Content: The ePDG Fully Qualified Domain Name (ePDG FQDN), for non-emergency bearers services, shall be constructed using one of the following formats, as specified in clause 4.5.4 of 3GPP TS 23.402[ Architecture enhancements for non-3GPP accesses ]  [68]: - Operator Identifier based ePDG FQDN; - Tracking/Location Area Identity based ePDG FQDN; - the ePDG FQDN configured in the UE by the HPLMN. NOTE: The ePDG FQDN configured in the UE can have a different format than those specified in the following clauses. The Visited Country FQDN is used by a roaming UE to determine whether the visited country mandates the selection of an ePDG in this country (see clause 4.5.4.5 of 3GPP TS 23.402[ Architecture enhancements for non-3GPP accesses ]  [68]). The Visited Country FQDN shall be constructed as specified in clause 19.4.2.9.4. The Replacement field used in DNS-based Discovery of regulatory requirements shall be constructed as specified in clause 19.4.2.9.5.