UA recognition & UA resolution INVITE sip:psap@leonianj.gov To: urn:service:sos Accept-Contact: *;sip.service="urn:service:sos" 9-1-1 (dial string) mapping INVITE sip:psap@leonianj.gov To: urn:service:sos Accept-Contact: *;sip.service="urn:service:sos" leonianj.gov mapping may recurse location information DHCP LLDP-MED |