| 911 Services / HBF Group | 634 |
| Aastra Telecom | 819 |
| Acme Packet | 919 |
| Adaptive Digital Technologies | 1035 |
| Adax, Inc | 1034 |
| ADTRAN | 229 |
| AdventNet | 542 |
| Aheeva | D-911 |
| Akademia, Inc. | 843 |
| Alianza | 1315 |
| Allied Data Technologies | 237 |
| Apex Voice Communications | 133 |
| Apparent Networks | 533 |
| Aricent | 1318 |
| Asteria Solutions Group | D-1014 |
| Astricon | D-811 |
| AT&T Wholesale | 625 |
| AudioCodes | 827 |
| Baytalkitec [P] Ltd. | 1434 |
| BillSoft, Inc. | 742 |
| Brix Networks | 717 |
| BroadFx Media, Inc. | 834 |
| BroadSoft | 1019 |
| Broadvox | 1237 |
| Cbeyond | 638 |
| CCH, A Wolters Kluwer business | 543 |
| Channel Vision Magazine | 840 |
| Check Point Software | 838 |
| ClearSight Networks, Inc. | 741 |
| Comarch | 738 |
| Commetrex Corporation | 633 |
| Communication Management Services | 1139 |
| CommuniGate Systems | 725 |
| Compunetix, Inc | 1023 |
| CounterPath | 228 |
| CTI Group | 639 |
| D2 Technologies | Room K |
| Data Connection Limited (DCL) | 733 |
| Dialcom Networks | 437 |
| Dialogic | 1319 |
| DIDX | 539 |
| Digium | D-1013 |
| Ditech Networks | 417 |
| Edgewater Networks, Inc. | 939 |
| Empirix | 127 |
| Endeavor Telecom | 637 |
| Excel Telecommunications | 121 |
| FaxBack | 836 |
| Fraunhofer IIS | 1136 |
| Freeside Billing | D-908 |
| Global Crossing | 1334 |
| GlobalPOPs | 126 |
| Grande Communications | 329 |
| Grandstream Networks | 1033 |
| HEAD acoustics | 735 |
| I6NET | 1027 |
| iBasis | 1233 |
| Infineon Technologies | 1133 |
| InnoMedia, Inc. | 1223 |
| Intelliverse | 325 |
| InterCall | 1415 |
| IPEVO, Inc. | D-914 |
| Ixia | 934 |
| Jazinga Inc. | 137 |
| Linksys | 233 |
| LiteScape | 1019 |
| Localphone | 1027 |
| Macadamian | 537 |
| Mediatrix Telecom | 1036 |
| MERA Systems | 336 |
| MetaSwitch | 1327 |
| mig33 | 734 |
| Movius | 617 |
| Mu Security, Inc. | 937 |
| Network Engines, Inc. | 1037 |
| Network IP | 333 |
| NextPoint | 425 |
| NMS Communications | 1218 |
| Nominum | 1235 |
| O1 Communications | 1411 |
| Openser Project | 1027 |
| OPTICOM GmbH | 1234 |
| Orca Wave | D-815 |
| OrecX | D-915 |
| OutDash Development | 1019 |
| Packet Island, Inc. | 334 |
| Pactolus Communications Software | 220 |
| Paetec | 536 |
| Panasonic | 525 |
| Pangea Communications Corp. | 221 |
| Paradial | 842 |
| PCCW Global | 337 |
| PEER 1 | 321 |
| PhoenixSoft | 942 |
| PhoneFusion | 938 |
| Polycom, Inc. | 517 |
| PortaOne | 927 |
| Presence Technology | D-910 |
| PSC Group, LLC | 1019 |
| Quintum Technologies, Inc. | 833 |
| Qwest Communications | 225 |
| RADVISION | 1127 |
| Sage Instruments | 117 |
| Sangoma | 1219 |
| Sansay | 933 |
| Seawolf Technologies, Inc. | 736 |
| SimulScribe | 1019 |
| Sinoco Information Technology, Inc. | 217 |
| snom technology | 1333 |
| SOLOMON Technology | 635 |
| Sotel IP Services | 434 |
| Stratus Technologies | 1119 |
| Strix Systems | 1134 |
| Sutus | 740 |
| SysMaster Corporation | 1135 |
| Talkdynamics | 217 |
| TalkSwitch | 835 |
| Telchemy | 1236 |
| TelcoBridges | 1309 |
| TELES USA | 1123 |
| TeleSphere | 219 |
| TelTel | 221 |
| Teridian Semiconductor Corporation | 219 |
| Texas Instruments | Press Room Sponsor |
| ThinkEngine Networks | 529 |
| TiVi | 433 |
| Touchstone Technologies, Inc | 116 |
| TransNexus | 1027 |
| Treedia Labs | 1419 |
| Tremor Media | 320 |
| Trinity Convergence | 1414 |
| Troop Software | 534 |
| TV Worldwide | 316 |
| U4EA Technologies | 1227 |
| UniData Communication Systems, Inc. | 1435 |
| Valid8.com | 642 |
| VendorRate | 743 |
| Viking InterWorks | 1336 |
| Visualware | 335 |
| VIXXI Solutions, Inc. | 926 |
| Voice System | 1027 |
| VoiceAge Corporation | 935 |
| VoIP AddOn | 1019 |
| VoIPFuture Ltd. | 737 |
| Voiplink Inc. | 235 |
| Voxbone | 837 |
| VozTelecom | 1027 |
| Westcon Group | D-912 |
| WYDE Voice | 1238 |
| Xorcom | D-909 |
| Yealink Network Technology Co., Ltd. | 535 |
| ZyXEL Communications | 120 |