Alemanha
ANGA - cable association
BAPT
Regulierungsbehörde für Telek. und Post (RegTP)
Citykom Münster
Deutsche Telekom
E-Plus
VIAG Interkom

Arábia Saudita
Arabsat
EAE - mobile operator
Saudi Telecom Co.

Argentina
Comisión Nacional de Comunicaciones ImpSat Movicom Multicanal
Nahuelsat
Secretaría de Comunicaciones
Telecom Argentina
Telefonica de Argentina
Telintar S.A.

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

Áustria
Connect Austria
Federal Ministry of Science and Transport
Mobilkom Austria
Post&Telekom Austria
Rundfunk & Telekom Regulierungs - GmbH
Telekom Austria
Telekom-Control

Bahrain
Batelco

Bielorússia
Beltelecom
Belcel
Ministry of Post and Telecommunications

Bélgica
Belgian Institute for Post and Telecomm. (BIPT)
Belgacom
IBPT

Bolívia
Comteco
Cosett
Cotas Entel Entel móvil Multivision Sittel
Telecel
Vidivisión

Brasil
Agência Nacional de Telecomunicações - ANATEL
Operadoras Banda A
Operadoras Banda B
Operadoras Wap
Operadoras SMS

Bulgária
BULFON
Committee of Posts and Telecommunications (CPT)
Mobikom

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

Caribe
ECTEL - Eastern Caribbean Telecomm. Authority

Chile
CTC (Chile)
ENTEL
Subtel
Telefónica del Sur

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

Chipre
CYTA - Cyprus Telecommunications Authority

Cingapura
Ministry of Transport, Posts and Telecommunications
Telecommunication Authority

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

Coréia do Sul
DACOM
Korea Telecom
KTFreetel
LG Telecom
Ministry of Information and Communication
SKTelekom

Costa Rica
Aresep
BeeperNet
Icetel

Croácia
Cronet
HT Croatia

Dinamarca
Telestyrelsen - National Telecom Agency Denmark
TeleDanmark

El Salvador
Superintendencia General de Electricidad y Telecom.

Equador
Andinatel
Etapa

El Salvador
Cablevisa Convergence (Cablevisa) CTE Antel Superintendencia General de Electricidad y Telecomunicaciones SIGET) Telefónica El Salvador Telemóvil
Televip

Emirados Árabes Unidos
Etisalat(Emirates Telecommunications Corp)
Thuraya Satellite Telecommunications Company

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

Eslovênia
Ministry of Transport and Communications
Telekom Slovenija

Espanha
AESDICA
ASTEL - Telecoms association
CMT: Comision del Mercado de las Telecomunic.
Airtel
Jazztel Telecom
Retevision
Telefonica de España

Estados Unidos
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

Estônia
Eesti Telefon
Estonian National Communications Board
Estonian Telecom Ltd.
Radiolinja Eesti
Ritabell

Europa
European Regulators Group

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

Finlândia
FINNET International
Helsinki Telephone Company
Helsinki Televisio
Ministry of Transport and Communications
OY Radiolinja
Sonera
Tampere Telephone Company
Telecommunications Administration Centre (TAC)
Tellehallintokeskus - Tel. Administration System

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

Grã Bretanha
Department of Trade and Industry (DTI)
Office of Communications - OFCOM

Grécia
Cosmote
National Telecommunications Commission (NTC)
OTE
Panafon
STET

Guatemala
C-net
Comtech - cable TV
Superintendencia de Telecomunicaciones ( SIT)
Telgua

Holanda
Dutchtone
Hoofddirectie Telecommunicatie en Post
Enertel
KPN Qwest
Libertel
OPTA: Onafhankelijke Post en Telecomm. Autoriteit
Unisource
VECAI

Honduras
Comisión Nacional de Telecomunicaciones (Conatel)
Hondutel

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

Hungria
Emitel MATAV Group Ministry of Transport, Communications and Water Management Pannon Westel

Iêmen
Teleyemen

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

Indonésia
Deparpostel
PT Satelindo
PT Telkom
PT Telkomsel

Irlanda
Commision for Communications Regulation
Eircell
Eircom
ODTR: Office of the Director of Telec. Regulation

Islândia
Post and Telecom Administration
Post and Telecom

Israel
BEZEQ- Israel Telecoms Corp
Israel Ministry of Communications

Itália
Albacom
Autorità per le Garanzie nelle Comunicazioni
Autostrade Telecomunicazioni
Ministry of Communications
Olivetti
Omnitel
Telecom Italia
TIM (Telecom Italia Mobile) 
Wind

Japão
DDI
IDC
Internet Initiative Japan (IIJ)
JapanTelecom
KDD
Ministry of Posts and Telecommunications (MPT)
NTT
NTT DoCoMo
PHS MoU Group

Jordânia
Jordan TRC

Kuwait
Kuwait MoCommunications

Latvia
Lattelekom
The Latvia Telecommunication State Inspection

Letônia
The Latvia Telecommunication State Inspection
Sabiedrisko pakalpojumu reguleanas komisija

Líbano
Lebanese Ministry of Telecommunication

Liechtenstein
Amt für Kommunikation / Office for C. - Liechtenstein

Lituânia
Comliet
Lietuvos Telekomas

Luxemburgo
Institut Luxembourgeois des Télécommunications

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

Malta
Malta Communications Authority

Marrocos
Ministry of Post and Telecommunications
National Regulation Agency

México
Cofetel
Comisión Federal de Telecomunicaciones
Axtel
Avantel
Movitel
Secretaria de Communicaciones y Transportes
TELMEX

Nova Zelândia
Clear Communications
CNPG - regulator
Telecom New Zealand

Nicarágua
Bellsouth - Nicacel
Enitel Nicacom
Telcor - regulator

Noruega
Janco Multicom 
Norwegian Post and Telecommun. Authority ( NPT)
Telenor
Telenordia

Oeste da África
West Africa Telecommunications Regulators Association - WATRA

Omã
Omanatel

Paquistão
PTA: Pakistan Telecommunication Authority
(Pak Telecom)

Palestina
Paltel

Panamá
Bell South
Cable & Wireless Panamá CWPanamá - Internet
Ente Regulador de los Servicios Públicos

Paraguai
Antelco
MOPC

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

Polônia
Centertel
Ministry of Posts and Telecommunications
Netia
Polkomtel
TelekomunikacjaPolska

Portugal
ICP: Instituto das Comunicações de Portugal
Optimus
Portugal Telecom
Telecel
TMN

Porto Rico
PuertoRico Telephone (Company)

Reino Unido
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

República Tcheca
Czech Telecommunications Office
SPT Telecom

Romênia
National Agency for Communications and Information
RomTelecom

Rússia
Rostelecom
Svyazinvest

Singapura
Mobile 1
SingaporeTelecom
Telecommunication Authority of Singapore (TAS)

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

Suiça
BAKOM - OFCOM
diAx
Sunrise communications
Swisscom

Síria
Syrian Telecommunications Establishment

Taiwan
Chunghwa Telecom

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

Turquia
Ministry of Transports and Communications
Turkcell
TurkTelekom

Ucrânia
Ukrtel (Ukrainian Telecom)
Utel

Uruguai
Ancel
ANTEL
Dirección General de Comunicaciones (DNG)

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

Vietnã
VNPT