Question: What is the correct format for constructing a Visited Country Emergency Fully Qualified Domain Name (FQDN) in accordance with 3GPP specifications?
Option 1: epdg.epc.mcc<MCC>.visited-country.pub.3gppnetwork.org
Option 2: sos.epdg.epc.mcc<MCC>.visited-country.pub.3gppnetwork.org
Option 3: mcc<MCC>.visited-country.pub.3gppnetwork.org/sos
Option 4: epdg.epc.visited-country.pub.3gppnetwork.org/mcc<MCC>/sos
Explanation: The correct format for constructing a Visited Country Emergency FQDN is by adding the label "sos" before the labels "epdg.epc" in the Visited Country FQDN, as specified in clause 19.4.2.9A.4 of the 3GPP TS 23.003 document. This ensures that emergency services can be properly routed and identified within the visited country's network.