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Non-Terminal NAPTRs (NTNs) - 2
NTNs - what they meant to say in the standards:
Note: RFC 3402 section 3 and RFC 3404 give the option of using either the REGEXP or the replacement field to generate or hold a domain name - no ENUM client handles this, so don’t provision NTNs with REGEXP field, as they will be ignored (at best :)
AFAICT, no DDDS client actually implements this (other DDDS applications do not need/use NTNs)
ENUM NTNs have empty flags and services fields
ENUM NTNs have a non-empty replacement field (holding the target domain to look for more NAPTRs), and so must have an empty REGEXP field
PPT Version