| 3Com Corporation |
| AudioTalk Networks |
| BroadSoft |
| Catapult Communications |
| Cisco Systems |
| Columbia University |
| Delta Informations Systems |
| Dialogic |
| dynamicsoft |
| Ericsson |
| Hewlett-Packard |
| Hughes Software Systems |
| Indigo Software |
| Iwatsu Electric Co., Ltd. |
| Komodo Technology |
| Lucent Technologies |
| MCI WorldCom |
| Mediatrix |
| Microappliances.com |
| Mitel Corp. |
| Motorola |
| NetSpeak |
| Network Associate |
| Nortel Networks |
| Nuera Communications |
| Oy LM Ericsson Ab |
| OZ.COM |
| Pingtel Corp. |
| RaveTel |
| Siemens |
| SS8 Networks |
| Startek Technologies |
| Telogy Networks, A Texas Instruments Company |
| Ubiquity Software |
| VegaStream Limited |
| Vovida Networks |
Last updated by Henning Schulzrinne