| Business | Phone |
| Teletronics Engineering Ltd 609 Kings Hwy E, Fairfield 6825 | (203) 384-6199 |
| Business Electronics Inc 2000 Post Rd # 302, Fairfield 6824 | (203) 259-7289 |
| Data Tel Llc 15 Renchy St, Fairfield 6824 | (203) 330-8832 |
| Extel Communications 75 Ardmore St, Fairfield 6824 | (203) 256-4744 |
| Fairfield Communications Group 11 Unquowa Rd, Fairfield 6824 | (203) 256-3399 |
| Novus Llc 338 Commerce Dr, Fairfield 6825 | (203) 331-1112 |
| Fairfield Business Phone Systems 1375 Kings Hwy Suite 545, Fairfield 06824 | (203) 916-5798 |