| Business | Phone |
| Vinego 2603 Vine St, Cincinnati 45219 | (513) 559-9400 |
| Communications Test Design 209 W 7th St # 121-400, Cincinnati 45202 | (513) 566-4040 |
| J M Telecommunications Cincinnati 45202 | (513) 241-0450 |
| Mark Communications 560 Mount Hope Ave, Cincinnati 45204 | (513) 353-0600 |