Editing Telephone number mapping (section)

==ENUM varieties==
One potential source of confusion, when talking about ENUM, is the variety of ENUM implementations in place today. Quite often, people speaking of ENUM are really referring to only one of the following: 
* ''Public ENUM'': The original vision of ENUM as a global, public directory-like database, with subscriber opt-in capabilities and delegation at the country code level in the e164.arpa domain. This is also referred to as ''user ENUM''.
* ''Open Enum'': An effort of mobile carriers and other parties involved in mobile numbering plans to generate complete, public database of all international numbering plan, available via public dns.
* ''Private ENUM'': A carrier, VoIP operator or ISP may use ENUM techniques within its own networks, in the same way DNS is used internally to networks.
* ''Carrier ENUM'': Groups of carriers or communication service providers agree to share subscriber information via ENUM in private peering relationships. The carriers themselves control subscriber information, not the individuals. Carrier ENUM is also referred to as ''infrastructure ENUM'', and is being the subject of new IETF recommendations to support [[Voice peering|VoIP peering]].....