http://www.rfc-editor.org/rfc/rfc3953.txt
RFC 3953: Telephone Number Mapping (ENUM) Service Registration for Presence Services, J. Peterson2005-01-01T23:00:00-00:00This document registers a Telephone Number Mapping (ENUM) service for presence. Specifically, this document focuses on provisioning pres URIs in ENUM. [STANDARDS-TRACK]