Section: 19.4.2.9A.7 Replacement field used in DNS-based Discovery of Emergency Numbers
Content: The NAPTR record(s) associated to the Country based Emergency Numbers FQDN shall be provisioned with the replacement field containing the emergency numbers and related emergency service types. The replacement field shall take the following form and include both an emergency number and at least one emergency service type: <emergency-type>.<emergency-number>.sos.en.epc.mcc<MCC>.visited-country.pub.3gppnetwork.org The <emergency-number> and <emergency-type> shall follow the syntax defined in Table 19.4.2.9A.7-1. The <emergency-number> shall consist of a single label. The <emergency-type> shall consist of at least one label. Table 19.4.2.9A.7-1: Syntax of emergency number and emergency type emergency-number = DIGIT*DIGIT ; at least one DIGIT emergency-type = "sos" *("." sub-label) sub-label = let-dig [ *61let-dig-hyp let-dig ] let-dig-hyp = let-dig / "-" let-dig = ALPHA / DIGIT ALPHA = %x41-5A / %x61-7A ; A-Z / a-z As an example, the NAPTR records associated to the Country based Emergency Numbers FQDN for MCC 345 are provisioned in the DNS as: sos.en.epc.mcc345.visited-country.pub.3gppnetwork.org ; IN NAPTR order pref. flag service regexp replacement IN NAPTR 100 999 "" "" sos.ambulance.15.sos.en.epc.mcc345.visited-country.pub.3gppnetwork.org IN NAPTR 100 999 "" "" sos.police.17.sos.en.epc.mcc345.visited-country.pub.3gppnetwork.org IN NAPTR 100 999 "" "" sos.fire.18.sos.en.epc.mcc345.visited-country.pub.3gppnetwork.org IN NAPTR 100 999 "" "" sos.marine.196.sos.en.epc.mcc345.visited-country.pub.3gppnetwork.org