| Business | Phone |
| Adex Corp 1702 N Collins Blvd, Richardson 75080 | (972) 234-2339 |
| Axes Technologies Inc 2140 Lake Park Blvd 300, Richardson 75080 | (972) 991-2900 |
| Communication Cost Control 1219 Abrams Rd 112, Richardson 75081 | (972) 690-7494 |
| Global Knowledge-Nortel It 1057 S Sherman St, Richardson 75081 | (214) 576-0200 |
| Oblio Telecom Inc 1750 N Collins Blvd, Richardson 75080 | (972) 470-9105 |
| Ramm Comm Telecommunications 606 Opal Ln, Richardson 75080 | (972) 690-9773 |
| Comtek Group 1565 N Central Expy, Richardson 75080 | (972) 644-6600 |
| Telephone Solutions Incommnctn Richardson 75081 | (972) 994-7800 |
| Mycom North America 1651 N Collins Blvd 240, Richardson 75080 | (972) 633-9222 |
| Arriso Networks Inc 2301 N Greenville Ave 300, Richardson 75082 | (214) 615-8710 |