| Business | Phone |
| Atx Communications Inc 470 Springpark Pl, Herndon 20170 | (703) 464-0191 |
| Avaya Inc 2250 Corporate Park Dr, Herndon 20171 | (571) 203-0910 |
| Concert Management Svc Inc 2355 Dulles Corner Blvd # 1000, Herndon 20171 | (703) 707-4000 |
| Orion Networks 745 Campbell Way, Herndon 20170 | (703) 752-1999 |
| Dslnet Inc 13625 Dulles Technology Dr, Herndon 20171 | (703) 793-5000 |
| Equant 13860 Redskin Dr, Herndon 20171 | (703) 435-8142 |
| France Telecom Inc 2300 Corporate Park Dr, Herndon 20171 | (703) 375-4913 |
| We Support U 481 Carlisle Dr, Herndon 20170 | (703) 796-6535 |
| T M Usa Inc 209 Elden St 307, Herndon 20170 | (703) 467-5962 |
| Lucent Technologies 13241 Woodland Park Rd, Herndon 20171 | (703) 707-0200 |
| Mitel Corp 205 Van Buren St 400, Herndon 20170 | (703) 318-7020 |
| Pulse Communications Inc 2900 Towerview Rd, Herndon 20171 | (703) 471-2900 |
| Net 2000 Communications 2180 Fox Mill Rd, Herndon 20171 | (703) 561-1044 |
| Netmasterclass Llc 13530 Dulles Technology Dr, Herndon 20171 | (571) 643-0183 |