| Business | Phone |
| A M Broadband Svc Inc 2020 Spring Garden Ave, Pittsburgh 15212 | (412) 231-5031 |
| A-J Communications Pittsburgh 15243 | (412) 429-3699 |
| Allo Phone Co 5 Sheryl Dr, Pittsburgh 15205 | (412) 276-2000 |
| Amcom Telecommunications 1400 Regency Dr, Pittsburgh 15237 | (412) 364-2888 |
| Ate Communications 424 Seminole Ave, Pittsburgh 15237 | (412) 369-0314 |
| Combest 1627 Penn Ave, Pittsburgh 15222 | (412) 586-2100 |
| Greyfox Systems Inc 230 Bilmar Dr, Pittsburgh 15205 | (412) 920-6100 |
| In Flow Inc 2202 Liberty Ave, Pittsburgh 15222 | (412) 594-2000 |
| Interlink Associates 2101 Greentree Rd, Pittsburgh 15220 | (412) 264-5450 |
| Intervoice Pittsburgh 15236 | (724) 969-0622 |
| Kessler Communications 3518 Willow Ave, Pittsburgh 15234 | (412) 531-3535 |
| Norcomm Communications Svc Inc Pittsburgh 15235 | (412) 241-1000 |
| Panda Technologies 6315 Forbes Ave, Pittsburgh 15217 | (412) 521-5000 |
| Ryan Ashton Communications Pittsburgh 15216 | (412) 337-1018 |
| Siemens Information & Comm 2 Penn Ctr W # 4, Pittsburgh 15276 | (412) 788-1180 |
| Stragetic Products & Svc 6948 Penn Ave, Pittsburgh 15208 | (412) 363-9400 |
| Tele-Solutions Inc Pittsburgh 15212 | (412) 322-5463 |
| Third Generation 300 Business Center Dr, Pittsburgh 15205 | (412) 489-1100 |
| U S Sprint 7 Parkway Ctr # 810, Pittsburgh 15220 | (412) 928-0900 |
| Warner Telecommunications Inc 229 Yardley Way, Pittsburgh 15206 | (412) 362-9000 |