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5.1.4.1.0.6.3.9.7.1.4.4.e164.arpa. IN NAPTR 400 10 "u" "E2U+sip" "!^.*$!sip:rrk5@sonusnet.com!"
ENUM NAPTR Flags
The NAPTR Resource Record (RR) uses the following format:
Domain TTL Class Type Order Preference Flags Service Regexp Replacement"Flags" is a <character-string> containing flags to control aspects of the rewriting and interpretation of the fields in the record. Flags are single characters from the set [A-Z0-9]. The case of the alphabetic characters is not significant.
At this time only four flags, "S", "A", "U", and "P", are defined.
The "S", "A" and "U" flags denote a terminal lookup. This means that this NAPTR record is the last one and that the flag determines what the next stage should be.
| Flag | Description |
|---|---|
| S | The next lookup should be for SRV records. |
| A | The next lookup should be for either an A, AAAA, or A6 record. |
| U | The next step is not a DNS lookup but that the output of the Regexp field is an URI that adheres to the 'absoluteURI' production found in the ABNF of RFC 2396 [9]. Since there may be applications that use NAPTR to also lookup aspects of URIs, implementors should be aware that this may cause loop conditions and should act accordingly. |
| P | The remainder of the application side algorithm shall be carried out in a Protocol-specific fashion. The new set of rules is identified by the Protocol specified in the Services field. The record that contains the 'P' flag is the last record that is interpreted by the rules specified in this document. |
For details refer to the IETF RFC at https://tools.ietf.org/html/rfc2915.
ENUM LNP
ENUM LNP enables number portability lookups in the IP network without the need to consult an external element in the SS7 network, thus simplifying call routing and networking operations.
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For configuration details, see:
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Load Balancing Support Across ENUM Servers
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