| Business | Phone |
| A T & T Government Relations 65 E State St # 700, Columbus 43215 | (614) 469-0010 |
| Accuvoice Inc 44 W Hubbard Ave, Columbus 43215 | (614) 291-1700 |
| Affordable Wiring Ltd 416 E Gates St, Columbus 43206 | (614) 444-9473 |
| Verizon Government Systems 17 S High St # 1250, Columbus 43215 | (614) 224-4830 |
| Atlantic Pacific Telecom Inc 3029 International St, Columbus 43228 | (614) 850-2880 |
| Avaya Inc 3443 Weyburn Ct, Columbus 43232 | (614) 825-6448 |
| Avaya Inc 850 Freeway Dr N, Columbus 43229 | (614) 846-0553 |
| United Telecom Svc 21369 Eakin Rd # E, Columbus 43223 | (614) 453-1020 |
| Telecom Ventures Llc 1335 Dublin Rd, Columbus 43215 | (614) 351-0004 |
| Sterling Communications 6830 Caine Rd, Columbus 43235 | (614) 799-2277 |
| Shawn Burdgerfer Inc 5349 Goldfield Dr, Columbus 43228 | (614) 529-8648 |
| Cbs Technologies 434 E Rich St, Columbus 43215 | (614) 224-9420 |
| Q A Productions 2041 Riverside Dr # 205, Columbus 43221 | (614) 486-7700 |
| Nu Vox Communications Inc 226 N 5th St, Columbus 43215 | (614) 304-0100 |
| Nortel Networks 2 Easton Oval, Columbus 43219 | (614) 418-4400 |
| Moremagic Solutions Inc 1105 Schrock Rd, Columbus 43229 | (614) 880-1188 |
| Midwest Telecommunications 188 Academy Woods Dr, Columbus 43230 | (614) 418-9420 |
| Kbk Group 1971 Beverly Rd, Columbus 43221 | (614) 488-2000 |