참고문헌
- ITUT E.164, 'The international public telecommunication numbering plan'
- IETF RFC 2916, 'E.164 number and DNS'
- IETF RFC 2915, 'NAPRR DNS Resource Record
- IETF, 'ENUM Call Flows for VoIP Interworking,' Internet Draft. draft lind enum callflows 02.txt
- IETF ENUM WG, http://www.ietf.org/html. charters/enum-charter.html
- ITU-T Study Group 2, http://www.itu.int/ITU-T/ studygroups/com02/index.html
- ITACT SG A Ad Hoc Report, 'Reportof DoS ITACT Advisory CommitteeStudy Group A Ad Hoc on ENUM'
- ENUM.org, http://www.enum.org
- Enum World, http://www.enumworld.com
- Netnumber, http://www.netnumber.com
- Webnum, http://www.verisign.com
- ENUM Forum, http:www.enum-f.org
- CyberTelecom, http://www.cybertelecom.org/dns/enum.htm