| 3Com Corporation |
| 8x8 |
| Agilent |
| BroadSoft |
| Catapult Communications |
| Cisco Systems |
| Columbia University |
| Delta |
| dynamicsoft |
| E*Club (Carnegie Mellon University) |
| Ericsson Inc. |
| Helsinki University of Technology |
| Hewlett-Packard Labs |
| Indigo |
| IPCell Technologies |
| MCI WorldCom |
| Mediatrix |
| Mitel Corp |
| Nortel Networks |
| Nuera Communications |
| OZ.COM |
| Pingtel Corp. |
| Radcom Equipment, Inc. |
| RaveTel |
| Telogy Networks |
| Vovida Networks |
Last updated by Henning Schulzrinne