What is ENUM (E.164 Number Mapping)?
ENUM (E.164 Number Mapping, RFC 6116) is an IETF standard that maps an E.164 phone number to internet resources — SIP URIs, email, web — by encoding the number as a domain name and looking it up in DNS. It lets carriers and enterprises route calls and messages to IP endpoints straight from a phone number, and underpins number portability and VoIP interconnect. See /answers/what-is-e164, /answers/what-is-mnp, and /answers/programmable-voice.
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