Fixed line operators and ISPs
- AOL (France)
- Bezeq (Israel)
- British Telecom
- Czesky Telecom
- Deutsche Telekom
- Eircom (Ireland)
- France Telecom
- Golden telecom (Russia)
- Nextel (Norway)
- PCCW (China)
- OTE (Greece)
- TeleDenmark
- Telekom Austria
- Telenor (Norway)
- TeliaSonera (Sweden)
- Telefonica (Germany &Spain)
- Tellas (Greece)
- Telkom South Africa
- Vodafone Arcor (Germany)
Wireless operators and MVNOs
- Cable&Wireless
- Carphone Warehouse (UK)
- Cegetel/SFR (France)
- Cellcom (Israel)
- China Mobile
- Cosmote (Greece)
- E-Plus (Germany)
- Hutchinson 3G (Italy)
- MTN (South Africa)
- MTS (Russia)
- New World Mobility (China)
- Orange
- O2 (Ireland, Germany)
- Swisscom Mobile
- T-Mobile
- Turkcell (Turkey)
- Vimpelcom (Russia)
- Virgin Mobile (UK)
- Vistream (Germany)
- Vodafone (UK, D, Ireland)
Software Vendors
- Alcatel
- Amdocs
- CMGLogica
- EDS
- EDB Telesciences
- HP
- IBM
- Intec
- LHS
- Lucent
- Metasolv
- Microsoft
- Nokia
- Oracle
- Portal
- Siemens
- SGI
- Telcordia
