Section: 28.3.2.2.7 Replacement field used in DNS-based Discovery of SNPN N3IWF for regulatory requirements
Content: 28.3.2.2.7.1 General If the visited country mandates the selection of an N3IWF in this country, the NAPTR record(s) associated to the Visited Country FQDN shall be provisioned with the replacement field containing FQDNs of SNPN N3IWFs located in the visited country. NOTE: If the visited country mandates the selection of the N3IWF in this country and the SNPN does not have an N3IWF in this country, the NAPTR record(s) associated to the Visited Country FQDN are provisioned with the replacement field containing an FQDN that cannot be resolved to an IP address. 28.3.2.2.7.2 Replacement field used in DNS-based Discovery of SNPN N3IWF supporting Onboarding If the visited country mandates the selection of an SNPN N3IWF supporting onboarding in this country, the NAPTR record(s) associated to the Visited Country FQDN for SNPN N3IWF supporting Onboarding shall be provisioned with the replacement field containing Operator Identifier based Onboarding FQDN for SNPN N3IWF located in the visited country. When UE sends the DNS query to the DNS server containing the Visited Country Onboarding FQDN for SNPN N3IWF (see clause 28.3.2.2.6.2), the DNS response should contain the Operator Identifier based Onboarding FQDN for SNPN N3IWF with the identity of an SNPN in the visited country supporting Untrusted non-3GPP access for UE Onboarding via N3IWF. If the UE has selected an SNPN for onboarding, the UE sends DNS query to the DNS server containing the Operator Identifier based Onboarding FQDN for SNPN N3IWF to query the identifier of the N3IWF supporting Onboarding, the DNS response should contain the identifier of the N3IWF supporting the onboarding in the SNPN identified by the SNPN ID. The replacement field shall take the form of Operator Identifier based Onboarding FQDN for SNPN N3IWF as below: "onboarding.n3iwf.5gc.snpnid<SNPNID>.mcc<MCC>.pub.3gppnetwork.org" As an example, the NAPTR records associated to the Visited Country Emergency SNPN FQDN for MCC 345, and for a) SNPN MCC 999, MNC 123, and NID 456789ABCDE; b) SNPN MCC 999, MNC 013, and NID 345678BCDEF, are provisioned in the DNS as: onboarding.n3iwf.snpn-5gc.mcc345.visited-country.pub.3gppnetwork.org ; IN NAPTR order pref. flag service regexp replacement IN NAPTR 100 999 "" "" onboarding.n3iwf.5gc.snpnid999123456789ABCDE.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" onboarding.n3iwf.5gc.snpnid999013345678BCDEF.mcc345.pub.3gppnetwork.org