| Business | Phone |
| Comdial Corp-Technical Svc 12500 Fair Lakes Cir, Fairfax 22033 | (703) 449-5520 |
| Grabill Brothers Comms Inc 10560 Warwick Ave, Fairfax 22030 | (703) 385-2124 |
| K-Comm Inc 11340 Nancyann Way, Fairfax 22030 | (703) 222-0026 |
| Stanwood Electronics 2810 Merrilee Dr B, Fairfax 22031 | (703) 280-4731 |