| AT&T | 104 |
| Computer Information Systems, Inc. (CIS) | 501 |
| Frontline Public Safety Solutions | 407 |
| INdigital | 110 |
| Mercury Systems Corporation | 500 |
| OnStar | 106 |
| Priority Dispatch | 400 |
| Supreme Radio Communications, Inc. | 711 |
| Tyler Technologies | 401/403 |
| Wold Architects and Engineers | 409 |
| Motorola | 609/611/613 |
| Mission Critical Partners | 300 |
| Solacom Technologies | 301 |
| Zetron, Inc. | 116/118/120 |
| Aladtec, Inc. | 201 |
| Exacom | 200 |
| TalkPoint Technologies, Inc. | 709 |