"This document updates the registration guidance provided in Section 4.2 of RFC 5031@ which allows the registration of service URNs with the 'sos' service type only for emergency services ""that are offered widely and in different countries"". This document updates those instructions to allow such registrations when@ at the time of registration@ those services are offered in only one country."
RFC 7163-2014 history
2014RFC 7163-2014 URN for Country-Specific Emergency Services