| Business | Phone |
| 800 Calling Card 635 Oaklynn Ct, Pittsburgh 15220 | (412) 344-4288 |
| A T & T Local Svc 2500 Allegheny Center Mall, Pittsburgh 15212 | (412) 316-4824 |
| Chaney & Assoc 230 Highview Ave, Pittsburgh 15238 | (412) 767-0307 |
| Crown Communications 2656 Idlewood Rd, Pittsburgh 15205 | (412) 921-2990 |
| Decision One 1707 Pennsylvania Ave, Pittsburgh 15233 | (412) 633-4112 |
| Decision One 2806 Broadway Ave, Pittsburgh 15216 | (412) 824-0761 |
| Decision One State Route 60, Pittsburgh 15205 | (412) 633-4707 |
| Ebsco Teleservices 100 Fleet St, Pittsburgh 15220 | (412) 937-9467 |
| Fiber Tech Networks 607 Penn Ave, Pittsburgh 15222 | (412) 338-0616 |
| Gte Government Systems 1000 Liberty Ave, Pittsburgh 15222 | (412) 434-0574 |
| Gte Internet Working 733 Gross St, Pittsburgh 15224 | (412) 621-9301 |
| Higgins & Assoc 501 Grant St # 437, Pittsburgh 15219 | (412) 486-2212 |
| Internet Inc 250 Mount Lebanon Blvd, Pittsburgh 15234 | (412) 571-3350 |
| Lucent Technologies 5 Parkway Ctr, Pittsburgh 15220 | (412) 875-4000 |
| Mci 1001 Liberty Ave, Pittsburgh 15222 | (412) 391-3636 |
| North America Telecomms 6580 Frankstown Ave, Pittsburgh 15206 | (412) 441-5912 |
| Riterateld.Com Po Box 16052, Pittsburgh 15242 | (724) 695-3041 |
| Transline Communications Inc 800 Vinial St, Pittsburgh 15212 | (412) 321-6040 |
| Triad Telecom 3459 5th Ave, Pittsburgh 15213 | (412) 535-0357 |
| Triad Telecom 3600 Forbes Ave, Pittsburgh 15213 | (412) 535-0356 |
| Triad Telecom Inc 117 N Negley Ave, Pittsburgh 15206 | (412) 345-5012 |
| Triad Telecom Inc 2000 Mary St, Pittsburgh 15203 | (412) 535-0368 |
| Triad Telecom Inc 230 Lothrop St, Pittsburgh 15213 | (412) 535-0317 |
| Us Lec Of Pennsylvania Inc 750 Holiday Dr # 590, Pittsburgh 15220 | (412) 250-1000 |
| Westinghouse Communications 1001 Brinton Rd, Pittsburgh 15221 | (412) 244-2000 |