U.S.A.
Federal Communications Commission (FCC)
http://www.fcc.gov

Argentina
National Communication Commission
http://www.cnc.gov.ar

Brasil
http://www.anatel.gov.br

Austria
Telekom-Control Austria (TKC)
http://www.tkc.at

Belgium
Belgian Institute of postal services and telecommunications (BIPT)
http://www.bipt.be

Denmark
National Telecom Agency
http://www.tst.dk

Finland
Telecommunications Administration Centre (TAC)
http://www.thk.fi

France
Telecommunications and Regulation Authority
http://www.art-telecom.fr

Netherland
Netherland Posts and Telecommunications Authority (OPTA)
http://www.opta.nl

Honkong
Office of the telecommunications Authority (OFTA)
http://www.ofta.gov.hk

United Kingdom
Office of Telecommunications (OFTEL)
http://www.oftel.gov.uk
Radiocommunications Agency
http://www.radio.gov.uk

Ireland
Office of the Director of Telecommunications Regulation (ODTR)
http://www.odtr.ie

Spain
Spain Telecommunication Commission (CMT)
http://www.cmt.es

Swiss
National Post and Telecom Agency (PTS)
http://www.pts.se

Switzerland
Federal Office for Communications
http://www.admin.ch/bakom

Italy
Italian Communications Authority (AGC)
http://www.agcom.it

Island
Post and Telecom Administration (PTA)
http://www.pta.is

Japan
Ministry of Posts and Telecommunications
http://www.mpt.go.jp

Canada
Canadian Radio-Television and Telecommunications Commission (CRTC)
http://www.crtc.gc.ca

Korea
Ministry of Information and Comminication (MIC)
http://www.mic.go.kr

Latvia
Telecommunication State Inspection
http://www.vei.lv

Lithuenya
Radio Administration
http://www.radio.lt/srfs.html

Luxembourg
Luxembourg Telecommunications Institute (ILT)
http://www.etat.lu

Norway
Norwegian Post and Telecommunications Authority (NPT)
http://www.npt.no

Poland
Ministry of Posts and Telecommunications
http://www.ml.gov.pl

Portugal
Portugal Comminications Institute (ICP)
http://www.icp.pt

Greek
National Telecommunications Commission (EET)
http://www.eett.gr