| Business | Phone |
| Buchart Horn Inc Engr 3150 Lenox Park Blvd # 300, Memphis 38115 | (901) 363-6355 |
| Parsons Telecom Inc 3855 Outland Rd, Memphis 38118 | (901) 362-0639 |
| Gulf States Engineering 4110 Moffett Rd, Memphis 38111 | (901) 320-0036 |
| Madison Group 6423 Shelby View Dr # 112, Memphis 38134 | (901) 381-2624 |