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Resolution: DDDS (Most) URNs have a resolution mechanism ? DDDS Extract service part, e.g., “sos.fire” Get domain D from local source: DHCP ? ISP as service provider domain part of AOR ? VSP as service provider SIP configuration Resolve NAPTR record for D: example.com. ; order pref flags service regexp replacement IN NAPTR 50 50 "u" "LOST+D2T" "!urn:service:(.*)!http://example.com/map/\1!i" . |