| Alcatel | Mount Vernon Consulting |
| Ameritech | National Audit Office (UK) |
| Amstrad | NET-Tel |
| Ascom | Nortel |
| AT&T | o.tel.o |
| AT&T Unisource | Octel (now Lucent) |
| Automobile Association | OSI |
| Belgacom | Perot Systems |
| Bell Northern Research | Philips Consumer Electronics |
| British Petroleum | Philips Information Systems |
| BT Europe | Philips Interactive Media Systems |
| Bull SA | Phillips Tarifica |
| Claus Steiner GmbH | Piercom |
| Cable & Wireless | Post Office IT |
| Cable Wireless Communications | PTT Telecom Netherlands |
| Centaur | Richmond Events |
| Chase Manhattan Bank | Saville Systems |
| Chessington Computer Centre | Scandinavian Airline Systems |
| City of Stockholm | SEMA Group |
| Cogent | Shoelace Productions |
| Communications Limited | SITA |
| debis | Sonera |
| Department of Trade and Industry | Sprint International |
| Detecon | Stentor |
| Deutsche Telekom | Stokab AB |
| Digital (Compaq) | Swedish Government |
| Electronic Data Systems | Swedish Post Office |
| Energis | SWIFT |
| Ericsson Business Communications AB | Systemhouse |
| Ericsson Business Consulting | Telecom Denmark |
| Ericsson Business Networks AB | Telecom Italia |
| Ericsson Infocom | Telecom Portugal |
| Ericsson Telecom | Teleglobe Inc. |
| European Commission | TeleLarm AB (Sweden) |
| Eutelis | Telemedia AB (Sweden) |
| France Telecom | Telenor (Norway) |
| GE Information Services (Sweden, UK, USA) | Telenordia |
| Global One | Telewest |
| GTE (BBN) | Telia AB |
| ICI | Telia Business Innovation |
| Indevo | Telia Megacom AB |
| Infonet Services | Telstra |
| Infostrada | Teracom |
| Intelsat | Timeplex Limited |
| LDI | Transpac |
| Lucent | Unisource |
| Lynx Technologies | Unisys |
| MCI Worldcom | US Robotics |
| McKinsey & Co | Vattenfall Vastnät AB |
| MDIS Limited | VISA |
| Mirror Image | Voicetek |
| Mitel | Wang |
| Moore Europe |