| Business | Phone |
| A T & T Cits 745 Tonapah St, Pittsburgh 15216 | (412) 344-8260 |
| Aargent Telecommunications 1537 Pineview Dr, Pittsburgh 15241 | (412) 257-8803 |
| Avaya Inc 5 Parkway Ctr, Pittsburgh 15220 | (412) 920-0363 |
| Bear Communications Inc 923 Mcneilly Rd, Pittsburgh 15226 | (412) 531-9509 |
| Cdc Cellular Pittsburgh 15205 | (412) 429-8454 |
| Concast America Inc 225 W Station Square Dr, Pittsburgh 15219 | (412) 316-5060 |
| Corporate Cost Controls Inc 802 North Ave, Pittsburgh 15209 | (412) 821-7750 |
| Global Crossing 2 Penn Ctr W # 326, Pittsburgh 15276 | (412) 788-4580 |
| Intermedia Communications Inc 1400 Penn Ave, Pittsburgh 15222 | (412) 258-3140 |
| Mci 1 Penn Ctr W # 420, Pittsburgh 15276 | (412) 505-4124 |
| Mci 3170 Sassafras Way, Pittsburgh 15201 | (412) 261-9378 |
| Net-Tel Communications 222 Camfield St, Pittsburgh 15210 | (412) 381-6232 |
| Stargate Local Svc 810 Parish St, Pittsburgh 15220 | (412) 920-4882 |
| Technology Solutions Group 8085 Saltsburg Rd, Pittsburgh 15239 | (412) 349-1160 |
| Tel Cove 200 Technology Dr, Pittsburgh 15219 | (412) 681-9600 |
| Tics Corp Pittsburgh 15237 | (412) 366-9850 |
| X O Communications Inc 1 Allegheny Center Mall, Pittsburgh 15212 | (412) 321-3100 |
| Qwest Communications 1 Station Sq # 600, Pittsburgh 15219 | (412) 355-0400 |