| Business | Phone |
| Nas Systems Inc 415 W Belden Ave, Addison 60101 | (630) 628-2251 |
| Servicios Telefonicos 116 N Church St, Addison 60101 | (630) 543-2584 |
| Telco Technologies Inc 1208 W Capitol Dr, Addison 60101 | (630) 543-1515 |
| Tip N Ring Inc 4n470 3rd Ave, Addison 60101 | (630) 543-5172 |