| Business | Phone |
| Advanced Ip Communications 1909 N Glenville Dr, Richardson 75081 | (214) 572-0710 |
| American Digicom Corp 1249 Commerce Dr, Richardson 75081 | (972) 480-9998 |
| Commworld Of Richardson-Plano 2512 Custer Pkwy, Richardson 75080 | (972) 437-2595 |
| Digital Telefones Inc 1719 Analog Dr, Richardson 75081 | (972) 231-3663 |
| Intellicall 1200 E Collins Blvd, Richardson 75081 | (972) 671-8028 |
| Leo Leo Trucking Llc 1164 Commerce Dr, Richardson 75081 | (972) 238-7759 |
| Optus Telemation 1110 E Collins Blvd 100, Richardson 75081 | (972) 498-9160 |
| Phone Strap 321 Woodcrest Dr, Richardson 75080 | (972) 480-9927 |
| Sbc 1651 N Collins Blvd, Richardson 75080 | (972) 994-8800 |
| Stone & Co Inc 777 S Central Expy, Richardson 75080 | (972) 480-0222 |
| Stratton Voice & Data Llc 1701 N Greenville Ave, Richardson 75081 | (972) 643-8900 |
| Telux Corporation 660 International Pkwy, Richardson 75081 | (972) 907-8999 |
| Triad Telephone Inc 1002 N Central Expy 245, Richardson 75080 | (972) 907-2608 |
| Bbx Technologies 800 E Campbell Rd 101, Richardson 75081 | (972) 424-2053 |