Section: 28.3.2.2.5 Replacement field used in DNS-based Discovery of regulatory requirements
Content: 28.3.2.2.5.1 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 the identity of the PLMN(s) in the visited country which may be used for N3IWF selection. The replacement field shall take the form of an Operator Identifier based N3IWF FQDN as specified in clause 28.3.2.2.2. 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: n3iwf.5gc.mcc345.visited-country.pub.3gppnetwork.org ; IN NAPTR order pref. flag service regexp replacement IN NAPTR 100 999 "" "" n3iwf.5gc.mnc012.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" n3iwf.5gc.mnc013.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" n3iwf.5gc.mnc014.mcc345.pub.3gppnetwork.org 28.3.2.2.5.2 Replacement field used in DNS-based Discovery of regulatory requirements for emergency services via N3IWF The NAPTR record(s) associated to the Visited Country Emergency N3IWF FQDN shall be provisioned with the replacement field containing the identity of the PLMN(s) in the visited country supporting emergency services in non-3GPP access via N3IWF. The replacement field shall take the form of an operator identifier based N3IWF FQDN as specified clause 28.3.2.2.2, with the addition of the label "sos" before the labels "n3iwf.5gc". As an example, the NAPTR records associated to the Visited Country Emergency N3IWF FQDN for MCC 345, and for MNC 012, 013 and 014, are provisioned in the DNS as: sos.n3iwf.5gc.mcc345.visited-country.pub.3gppnetwork.org ; IN NAPTR order pref. flag service regexp replacement IN NAPTR 100 999 "" "" sos.n3iwf.5gc.mnc012.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" sos.n3iwf.5gc.mnc013.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" sos.n3iwf.5gc.mnc014.mcc345.pub.3gppnetwork.org 28.3.2.2.5.3 Replacement field used in DNS-based Discovery of N3IWF supporting Onboarding If the visited country mandates the selection of an N3IWF supporting onboarding in this country, the NAPTR record(s) associated to the Visited Country FQDN for N3IWF supporting Onboarding shall be provisioned with the replacement field containing the Operator Identifier based Onboarding FQDN for N3IWF located in the visited country. When UE sends the DNS query to the DNS server containing the Visited Country Onboarding FQDN for N3IWF (see clause 28.3.2.2.4.3), the DNS response should contain the Operator Identifier based Onboarding FQDN for N3IWF containing the identity of the PLMN(s) in the visited country which may be used for N3IWF selection in the visited country supporting Untrusted non-3GPP access for UE Onboarding via N3IWF. If the UE has selected an PLMN for onboarding, the UE sends DNS query to the DNS server containing the Operator Identifier based Onboarding FQDN for 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 PLMN identified by the PLMN ID. The replacement field shall take the form of Operator Identifier based Onboarding FQDN for N3IWF as below: "onboarding.n3iwf.5gc.mnc<MNC>.mcc<MCC>.pub.3gppnetwork.org" 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 for N3IWF supporting Onboarding. As an example, the NAPTR records associated to the Visited Country FQDN for N3IWF supporting Onboarding for MCC 345, and for MNC 012, 013 and 014, are provisioned in the DNS as: onboarding.n3iwf.5gc.mcc345.visited-country.pub.3gppnetwork.org ; IN NAPTR order pref. flag service regexp replacement IN NAPTR 100 999 "" "" onboarding.n3iwf.5gc.mnc012.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" onboarding.n3iwf.5gc.mnc013.mcc345.pub.3gppnetwork.org IN NAPTR 100 999 "" "" onboarding.n3iwf.5gc.mnc014.mcc345.pub.3gppnetwork.org