Section: 19.4.2.9.4 Visited Country FQDN
Content: The Visited Country FQDN, used by a roaming UE to determine whether the visited country mandates the selection of an ePDG in this country, shall be constructed as described below. The Visited Country FQDN shall contain a MCC that uniquely identifies the country in which the UE is located. The Visited Country FQDN is composed of seven labels. The last three labels shall be "pub.3gppnetwork.org". The fourth label shall be "visited-country". The third label shall uniquely identify the MCC of the visited country. The first and second labels shall be "epdg.epc". The Visited Country FQDN shall be constructed as follows: "epdg.epc.mcc<MCC>.visited-country.pub.3gppnetwork.org" The <MCC> coding used in this FQDN shall be: - <MCC> = 3 digits As an example, the Visited Country FQDN for MCC 345 is coded in the DNS as: "epdg.epc. mcc345.visited-country.pub.3gppnetwork.org".