'''ENUM''' ('''Electronic Numbering''') is a protocol developed by the [[IETF|Internet Engineering Task Force]]'s (IETF) Telephone Number Mapping Working Group,<ref>[http://www.itu.int/osg/spu/enum/ www.itu.int]</ref> which used the [[DNS|Domain Name System]] (DNS) architecture and protocol | '''ENUM''' ('''Electronic Numbering''') is a protocol developed by the [[IETF|Internet Engineering Task Force]]'s (IETF) Telephone Number Mapping Working Group,<ref>[http://www.itu.int/osg/spu/enum/ www.itu.int]</ref> which used the [[DNS|Domain Name System]] (DNS) architecture and protocol |