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NAPTR RR Structure IN NAPTR 10 10 “u” “E2U+ifax” “!^.*$!mailto:me@domain.foo!” IN NAPTR 10 10 "u" “E2U+SIP "!^.*$!sip:+12025332800@network.foo" . Order field indicates order of rules in DDDS current ENUM practice is to set order to common value (10) . Preference could indicates service selection. U Flag – Terminal lookup resulting in URI enumservice field: Specifies protocol to use to communicate with the E2U service defined in RFC3761 (SIP = RFC 2543) (mailto =SMTP) etc IESG maintains enumservice registration field oversight in the IANA Registry order preference flag enumservice field regexp |