http://www.rfc-editor.org/rfc/rfc4114.txt
RFC 4114: E.164 Number Mapping for the Extensible Provisioning Protocol (EPP), S. Hollenbeck2005-06-01T23:00:00-00:00This document describes an Extensible Provisioning Protocol (EPP) extension mapping for the provisioning and management of E.164 numbers that represent domain names stored in a shared central repository. Specified in XML, this mapping extends the EPP domain name mapping to provide additional features required for the provisioning of E.164 numbers. [STANDARDS-TRACK]