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Complex Rule Sets A NAPTR RRSet defines the policy of a domain. “order” and “preference” define a Boolean expression of individual policy rules. Example: $ORIGIN example.com. ; order pref flags service regexp replacement (1) IN NAPTR 10 50 "U" "D2P+SIP:fed" "!^.*$!http://sipxconnect.example.org/!" . (2) IN NAPTR 20 10 "U" "D2P+SIP:std" "!^.*$!urn:ietf:rfc:2246!" . (3) IN NAPTR 20 15 "U" "D2P+SIP:std" "!^.*$!urn:ietf:rfc:3711!" . (1) OR ( (2) AND (3) ) |