| Business | Phone |
| B T North America Broadcast 2025 M St Nw, Washington 20036 | (202) 898-0058 |
| B T North America Inc 601 Pennsylvania Ave Nw # 625, Washington 20004 | (202) 639-8222 |
| Covad Communications 600 14th St Nw # 750, Washington 20005 | (202) 220-0400 |
| Deutsche Telekom 1020 19th St Nw # 850, Washington 20036 | (202) 452-9100 |
| Efj Inc 1232 22nd St Nw # 600, Washington 20037 | (202) 833-7780 |
| Fairchild Communications 1300 Pennsylvania Ave Nw, Washington 20004 | (202) 289-1529 |
| F M Communication Plus 3917 14th St Nw, Washington 20011 | (202) 726-4001 |
| Fiberlessnet Inc 1225 I St Nw # 402, Washington 20005 | (202) 371-6650 |
| Genuity Telecom 400 N Capitol St Nw # G150, Washington 20001 | (202) 628-8119 |
| Global Communicators 1925 K St Nw # 245, Washington 20006 | (202) 371-9600 |
| Global Telecommunications 2101 Connecticut Ave Nw, Washington 20008 | (202) 667-4200 |
| Interactive Telecom Group 3146 M St Nw, Washington 20007 | (202) 625-2000 |
| Intermedia Communications 1850 M St Nw # 120, Washington 20036 | (202) 775-0901 |
| Isi Telecommunications Inc 509 15th St Se, Washington 20003 | (202) 543-1364 |
| Kdw Group 1200 19th St Nw # 500, Washington 20036 | (202) 955-9659 |
| Mci 1133 19th St Nw, Washington 20036 | (202) 736-6700 |
| Mci 1220 L St Nw, Washington 20005 | (202) 842-4734 |
| Mfs-Icc 2025 M St Nw, Washington 20036 | (202) 293-0215 |
| Network Access Solutions Corp 1399 New York Ave Nw, Washington 20005 | (202) 783-3576 |
| Neustar Inc 2000 M St Nw # 600, Washington 20036 | (202) 533-2600 |
| North America Telecomms 3705 Benning Rd Ne, Washington 20019 | (202) 388-4640 |
| One Link 1405 E St Se, Washington 20003 | (202) 675-2066 |
| Samuels Telecommunications 820 7th St Ne, Washington 20002 | (202) 543-7509 |
| Sbc 1401 I St Nw # 1100, Washington 20005 | (202) 326-8800 |
| Sonet Net Telecom 1818 New York Ave Ne, Washington 20002 | (202) 526-7606 |
| Talk & Tel 2 Telecommunication 832 Shepherd St Nw, Washington 20011 | (202) 545-0000 |
| Telecommunications Reports 1333 H St Nw, Washington 20005 | (202) 408-5102 |
| Teleport Communications Group 1331 F St Nw # 925, Washington 20004 | (202) 756-2000 |
| Western Telecommunication 227 Massachusetts Ave Ne, Washington 20002 | (202) 548-0202 |
| Winstar Communications 1146 19th St Nw, Washington 20036 | (202) 530-0993 |
| World Data 1015 18th St Nw # 710, Washington 20036 | (202) 785-6800 |
| X O Communications Inc 1919 M St Nw # 420, Washington 20036 | (202) 296-7720 |
| Xantic Inc 1211 Connecticut Ave Nw, Washington 20036 | (202) 785-5614 |
| Ventel Telecommunications Inc 1050 Connecticut Ave Nw, Washington 20036 | (202) 772-3121 |
| Voice Systems Engineering 1275 K St Nw, Washington 20005 | (202) 842-9400 |
| A T & T 1120 20th St Nw # 1000, Washington 20036 | (202) 457-3810 |