| Business | Phone |
| Corechange 15301 Spectrum Dr, Addison 75001 | (972) 789-2954 |
| Frontier Communications 5080 Spectrum Dr, Addison 75001 | (972) 387-9067 |
| Ionex Telecommunications 15305 Dallas Pkwy, Addison 75001 | (214) 646-2300 |
| Logix Communications 15301 Spectrum Dr, Addison 75001 | (214) 915-4100 |
| Netensity Inc 15301 Dallas Pkwy, Addison 75001 | (972) 866-5888 |
| Optical & Telecommunications 16835 Addison Rd, Addison 75001 | (972) 931-0360 |
| Phones For All 14681 Midway Rd 105, Addison 75001 | (972) 503-3388 |
| Riverrock Systems Ltd 15601 Dallas Pkwy 700, Addison 75001 | (972) 982-9730 |
| Titan Telecom Solutions Inc 14683 Midway Rd, Addison 75001 | (972) 386-6242 |
| Ulticom Inc 4275 Kellway Cir, Addison 75001 | (972) 726-9345 |