Argentina
Comisión Nacional de Comunicaciones

ImpSat

Movicom

Multicanal
Nahuelsat
Secretaría de Comunicaciones
Telecom Argentina
Telefonica de Argentina
Telintar S.A.

Australia
Australian Communications Authority(ACA)
Cable & Wireless Optus Communications
Hutchison Telecoms
Telstra
Telstra MobileNet

Austria
Connect Austria
Mobilkom Austria
Post&Telekom Austria
Telekom Austria
Telekom-Control

Bahrain
Batelco

Belarus
Beltelecom
Belcel
Ministry of Post and Telecommunications

Belgium
Belgian Institute for Post and Telecommunications (BIPT)
Belgacom
IBPT
 

Bolivia

Comteco

Cosett

Cotas

Entel

Entel móvil

Multivision

Sittel

Telecel
Vidivisión

Brazil
Agência Nacional de Telecomunicações (ANATEL)

Amazônia Celular

BCP Telecomunicações
Conectel
Embratel

Fittel

Globo Cabo

Ministry of Communications

Mobitel

PowerNet

SkyLink

TELEBRAS

Tele Centro Sul Participaçoes

Telefónica Celular (CRT)

Telemar

Telemensagem

Telemig Celular

Telesp

Telesp Celular
Teletrim

Bulgaria
BULFON
Committee of Posts and Telecommunications (CPT)
Mobikom

Canada
BCE
BellNexxia
Canadian Radio-television and Telecommunications Commission
Savage Tele.com Corporation
SaskTel
Teleglobe
Telesystem International Wireless (TIW)
Telus

Chile
CTC (Chile)
ENTEL
Subtel
Telefónica del Sur

China
China Telecom
China Unicom
FarEasTone
Ministry of Information Industry
New T&T
New World Telephone

Colombia
Celcaribe
Colomsat
Comisión de Regulación de Telecomunicaciones
ETB
Telecom Colombia
Teleupar - Valledupar telco

Costa Rica
Aresep
BeeperNet
Icetel

Croatia
Cronet
HT Croatia

Cyprus
CYTA - Cyprus Telecommunications Authority

Czech Republic
Czech Telecommunications Office
SPT Telecom

Denmark
Telestyrelsen - National Telecom Agency Denmark
TeleDanmark

Ecuador
Andinatel
Etapa

El Salvador

Cablevisa

Convergence (Cablevisa)

CTE Antel

Superintendencia General de Electricidad y Telecomunicaciones (SIGET)

Telefónica El Salvador

Telemóvil
Televip

Estonia
Eesti Telefon
Estonian Telecom Ltd.
Radiolinja Eesti
Ritabell

Finland
FINNET International
Helsinki Telephone Company
Helsinki Televisio
OY Radiolinja
Sonera
Tampere Telephone Company
Telecommunications Administration Centre (TAC)

France
ART: l'Autorité de Régulation des Télécommunications
Bouygues Télécom
Cegetel
First Telecom France
France Telecom
France Telecom OpenTransit
Rennes Telecom
VIVENDI

Germany
ANGA - cable association
BAPT
Regulierungsbehörde für Telekommunikation und Post (RegTP)
Citykom Münster
Deutsche Telekom
E-Plus
Mannesmann
VIAG Interkom

Greece
Cosmote
National Telecommunications Commission (NTC)
OTE
Panafon
STET

Guatemala

C-net

Comtech - cable TV

Superintendencia de Telecomunicaciones (SIT)
Telgua

Honduras
Comtelca - telecoms association

Comisión Nacional de Telecomunicaciones (Conatel) - telecoms regulator
Hondutel

Hong Kong
Cable & Wireless HKT
ChinaTelecom (Hong Kong)
First Pacific
Hongkong Telecom
OFTA: Office of the Telecommunications Authority
Peoples Telephone Co.
SmarTone Communications
 

Hungary

Emitel

MATAV Group

Ministry of Transport, Communications and Water Management

Pannon

Westel
 

India

BPL Mobile

DoT India
Hutchison Max Telecom
Mobilink
MTNL
Telecommunications Regulatory Authority
Usha Martin Telecom
VSNL

Indonesia
Deparpostel
PT Satelindo

PT Telkom
PT Telkomsel

Ireland
Eircell
Eircom
ODTR: Office of the Director of Telecommunications Regulation

Isreal
BEZEQ- Israel Telecoms Corp
Israel Ministry of Communications

Italy
Albacom
Autorità per le Garanzie nelle Comunicazioni
Autostrade Telecomunicazioni
Olivetti
Omnitel
Telecom Italia
TIM(Telecom Italia Mobile)
Wind

Japan
DDI
IDC
Internet Initiative Japan (IIJ)
JapanTelecom 
KDD
Ministry of Posts and Telecommunications (MPT)

NTT
NTT DoCoMo
PHS MoU Group

Jordan
Jordan TRC

Kuwait
Kuwait MoCommunications

Latvia
Lattelekom
The Latvia Telecommunication State Inspection

Lebanon
Lebanese Ministry of Telecommunication

Lithuania
Comliet
Lietuvos Telekomas

Malaysia
Celcom
Jabatan Telekom Malaysia
Measat
Ministry of Energy, Telecoms and Post Malaysia
Sapura
Telekom Malaysia
Time Telekom
TRI(Technology Resources Industries)

Mexico
Cofetel
Axtel
Avantel
Movitel
Secretaria de Communicaciones y Transportes
TELMEX

Netherlands
Dutchtone
Hoofddirectie Telecommunicatie en Post
Enertel
KPN Qwest
Libertel
OPTA: Onafhankelijke Post en Telecommunicatie Autoriteit
Unisource
VECAI

New Zealand
Clear Communications
CNPG - regulator
Telecom New Zealand

Nicaragua
Bellsouth - Nicacel

Enitel

Nicacom
Telcor - regulator

Norway
Janco Multicom
Norwegian Post and Telecommunications Authority (NPT)
Telenor
Telenordia

Oman
Omanatel

Pakestan
PTA: Pakistan Telecommunication Authority
PTCL(Pak Telecom)

Palestine
Paltel

Panama
Bell South

Cable & Wireless Panamá

CWPanamá - Internet
Ente Regulador de los Servicios Públicos

Paraguay
Antelco
MOPC

Peru
Cable Mágico
FirstCom
Organismo Supervisor de Inversión Privada en Telecomunicaciones(OSIPTEL)
PeruSat
Tele2000
Telefonica del Peru

Philippines
Globe Telecom
Pilipino Telephone Corp. (PILTEL)
PLDT- Philippines
Smart Communications

Poland
Centertel
Ministry of Posts and Telecommunications
Netia
Polkomtel
TelekomunikacjaPolska

Portugal
Autoridade Nacional de Comunicações (ANACOM)
Optimus
Portugal Telecom
Telecel
TMN

Puerto Rico
PuertoRico Telephone (Company)

Romania
National Agency for Communications and Information
RomTelecom

Russia
Rostelecom
Svyazinvest

Saudi Arabia

Arabsat
EAE - mobile operator
Saudi Telecom Co.

Singapore
Mobile 1

SingaporeTelecom
Telecommunication Authority of Singapore (TAS)

Slovakia
Globtel
Ministry of Transport, Posts and Telecommunications
Regulatory Authority
Slovak Telecom

Slovenia
Ministry of Transport and Communications
Telekom Slovenija

South Africa
South Africa Telecommunication Regulatory Authority (SATRA)
TelekomSA

South Korea
DACOM
Korea Telecom
KTFreetel
LG Telecom
Ministry of Information and Communication
SKTelekom

Spain
AESDICA
ASTEL - Telecoms association
CMT: Comision del Mercado de las Telecomunicaciones

Airtel
Jazztel Telecom
Retevision
Telefonica de Espana

Sweden
Comviq

Europolitan

National Posts & Telecommunications Agency (PTS)
NetCom AB
NETnet AB
Tele2
Telenordia
Telia

Switzerland
BAKOM - OFCOM
diAx
Sunrise communications
Swisscom

Syria
Syrian Telecommunications Establishment

Taiwan
Chunghwa Telecom

Thailand
Advanced Info Service (AIS)
Communications Authority of Thailand [CAT]
Digital Phone Company (DPC)
Shin Corporations
Thai Telephone and Telecommunications
TelephoneOrganization of Thailand

Turkey
Ministry of Transports and Communications

Turkcell
TurkTelekom

Ukraine
Ukrtel(Ukrainian Telecom)
Utel

United Arab Emirates
Etisalat(Emirates Telecommunications Corp)
Thuraya Satellite Telecommunications Company

United Kingdom
BABT: British Approvals Board for Telecommunications
BT
Cable & Wireless Communications
Cable and Wireless plc
COLT Telecom
Dolphin Telecom
Energis

Fibernet
First Telecom UK
KDD Europe
Kingston Communications
NTL
OFTEL
One 2 One
Orange
ScottishTelecom
Swiftcall
Telewest
The Radiocommunications Agency
Vodafone

Uruguay
Ancel
ANTEL
Dirección General de Comunicaciones (DNC)

USA
Alltel
AT&T
BellAtlantic
BellSouth International
Call-Net
CenturyTelephone Enterprises

COMSATCorporation

Concentric

Concert
CRL Network Services
e.spire Communications Inc.
FaciliCom International
Federal Communications Commission
Federal TransTel Inc (FTT)
GE Information Services
Global One
Globalstar
GlobalTeleSystems (GTS)
GTE
Infonet Services Corporation
Inmarsat
Intelsat
Iridium
IXnet
Loral Orion
MCI WorldCom
Nextel Communications, Inc.
PanAmSat Corporation
PSINet
RogersCommunications
RSL COM

SBC Communications

Sprint
Teledesic
USWest
Verio
WorldPartners/WorldSource
WorldPort Communications

Venezuela
CANTV
Casetel
Comisión nacional de Telecomunicaciones(Conatel)
Movilnet
Telcel

Vietnam
VNPT