Section: 19.4.2.9.5 Replacement field used in DNS-based Discovery of regulatory requirements
Content: If 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 NAPTR record(s) associated to the Visited Country FQDN shall be provisioned with the replacement field containing the identity of the PLMN(s) in the visited country which may be used for ePDG selection. The replacement field shall take the form of an Operator Identifier based ePDG FQDN as specified in clause 19.4.2.9.2. For countries with multiple MCC, the NAPTR records returned by the DNS may contain a different MCC than the MCC indicated in the Visited Country FQDN. As an example, the NAPTR records associated to the Visited Country FQDN for MCC 345, and for MNC 012, 013 and 014, are provisioned in the DNS as: epdg.epc.mcc345.visited-country.pub.3gppnetwork.org ; IN NAPTR order pref. flag service regexp replacement IN NAPTR 100 999 "" "" epdg.epc.mnc012.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" epdg.epc.mnc013.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" epdg.epc.mnc014.mcc345.pub.3gppnetwork.org