| Business | Phone |
| Wisor Telecommunications 15825 Shady Grove Rd, Rockville 20850 | (301) 417-9401 |
| Amg Communications 332 Hungerford Dr, Rockville 20850 | (301) 251-9006 |
| Teletronics International Inc 2 Choke Cherry Rd, Rockville 20850 | (301) 309-8500 |
| Telnet Inc 51 Monroe St, Rockville 20850 | (301) 762-9010 |
| Skd Systems Corp 11844 Dinwiddie Dr, Rockville 20852 | (301) 984-7657 |
| Cilutions 1 Church St, Rockville 20850 | (301) 340-6800 |
| Pivotal Point Inc 10836 Antigua Ter, Rockville 20852 | (301) 984-7818 |
| Planar Communications Corp 13407 Bartlett St, Rockville 20853 | (301) 460-6402 |
| Pas-Com Inc 16608 Winterwoods Ct, Rockville 20853 | (301) 774-8120 |
| Network Engineering & Mngmt 9401 Overlea Dr, Rockville 20850 | (301) 279-7406 |
| Operational Communication Svc 6110 Executive Blvd, Rockville 20852 | (301) 770-0940 |
| National Business Group Inc 1300 Piccard Dr, Rockville 20850 | (301) 548-0100 |
| Frequentis Usa Inc 12530 Parklawn Dr # 360, Rockville 20852 | (301) 657-8001 |
| Frost Communications 5901 Montrose Rd # S1300, Rockville 20852 | (301) 984-8722 |
| Gini Inc 6213 Executive Blvd, Rockville 20852 | (301) 468-2391 |