Aircel
Chunghwa Telecom
Exelcomindo
Henan Mobile
Idea Cellular
Liaoning Mobile
Optus
PMD, Pakistan
Reliance Communications

RMSI
SingTel
Taiwan Mobile
Tata
Telekom Malaysia
Unified Communications
Unitech Wireless
Warid Telecom

America Movil
Axtel
Cable & Wireless West Indies
CANTV
Claro
Cofetel
Nextel Mexico

Oi
Telcel
Telefonica Moviles
Telefonica Telecom Colombia
Telesp
Telmex
TSTT, Trinidad & Tobago

Aramco Services
Arcor
BASE
Bezeq
Bredbaand Nord
British Sky Broadcasting
British Telecom
Cable & Wireless
Cellcom
Colt Telecommunications
CITC
Comarch
Correas Telecom
Cosmote
Deutsche Telekom
Easynet
EETT
Eircom
Elisa Communications
Eptisa
Etisalat
France Telecom
Gantek
GISTEC
Giza Systems
Grintek
Grupo EP
Independent Fibre Networks
Informi GIS
Israel Ministry of Defense
Kuwait Ministry of Communications
Magnet Networks
Mano Numeris
Maroc Telecom
Mobilink
Mobinil
Multiregional Transit Telecom (MTT)
NTRA

O2
Oman Mobile
ONA Group
Oni Telecom
Orange
Orange UK
OTE
Qtel
R-Cable
Romtelecom
Saab Grintek
Saudi Telecom
Saudi University
Sitesa
SNCF
Sonaecom
Steria
Swisscom
Technoserv
Telecom Italia
Telefonica Moviles
Telefonica
Telekom Slovenije
Telenor
Tellcom Iletisim Hizmetleri
T-Hrvatski Telekom
T-Mobile
Tre-For
Turkcell
Vodafone
Wana
Wind
Zain

Adtran
Affinity Mobile
Air Force Research Laboratory
Alcatel-Lucent
APC Wireless
Apptis
Army Research Laboratory
AT&T
Axia Supernet
Azteca Mobile
BAE Systems
Bell Canada
Booz Allen Hamilton
Bright House Networks
California Analysis Center (CACI)
Cbeyond
Cellular South
CenturyLink
Charter Communications
Ciena
Cincinnati Bell
Cisco
Comcast
Connectiv Solutions
Cox Communications
Cricket Communications
DARPA
Deltathree
Department of Defense Information Library
DISA
Drug Enforcement Administration
FairPoint Communications
Federal Reserve Bank
FirstEnergy
Flying J
Frontier Communications
Fujitsu
General Dynamics
Genie
GSA
Hawaiian Telcom
Hydro One
Hydro-Quebec
IDT Corporation
Infotech Enterprises
InPhonex
Intelligent Automation
I-Wireless
Juniper Networks
Kajeet

KDDI
Lear Siegler Services
Level 3 Communications
Lockheed Martinbr
Manitoba Telecom Services
MTS Allstream
Nortel
Northrop Grumman
nTelos
Oblio
Office of Naval Research
One Communications
PhoneCo
Pulse Communications
Qwest
Ready Wireless
Redback Networks
SAIC
SaskTel
Shaw Telecom
Sierra Telephone
Sprint Nextel
Sun
Sycamore Networks
Syniverse
Tekelec
Telepacific Communications
Telepath Networks
Tellabs
Telus
TelWest
TerreStar Networks
Time Warner
T-Mobile
Toshiba
Total Call
Toyota
URS Corporation
USAC
US Air Force
US Army CECOM
Valley Telephone Coop
Verisign
Verizon
Verizon Wireless
Videotron
Virgin Mobile
XO Communications
Ztar