| Acme Packet | 312 |
| AdventNet | 224 |
| AG Projects | 421 |
| Belgacom International Carrier Services | Sponsor |
| Comdasys AG | 225 |
| Comverse | 201 |
| Data Connection Limited (DCL) | 119 |
| Deutsche Telekom | 222 |
| Dialogic Corporation | 325 |
| Digium | 207 |
| Doro | 319 |
| Excendia | 122 |
| Global IP Solutions | 113 |
| Grandstream Networks | 212 |
| HEAD acoustics GmbH | 120 |
| Highside Telecom BV | 213 |
| InterTalk International | 306 |
| Invite Networks | 214 |
| Iskratel | 314 |
| MU Security | 227 |
| Newport Networks Ltd. | 323 |
| nPlusOne Limited | 326 |
| PIKA Technologies, Inc. | 210 |
| Polycom, Inc. | 307 |
| PortaOne | 115 |
| Psytechnics | 318 |
| RTX Network Systems | 419 |
| Sangoma | 107 |
| Sipwise | 320 |
| Spider Research Project | 321 |
| Spirent Communications | 112 |
| TelcoBridges | 218 |
| Teridian Semiconductor Corporation | 313 |
| Testing Technologies | 226 |
| Trinity Convergence Limited | 217 |
| Viking InterWorks | 121 |
| VOIPFUTURE | 415 |
| Worldcall | 324 |
| XConnect | 413 |