| Business | Phone |
| Zenitel Usa 2265 Roswell Rd, Marietta 30062 | (770) 509-2270 |
| T & T Communication Inc 1000 Pine Mill Dr, Marietta 30066 | (770) 426-0800 |
| Tele-Source Inc 600 W Sandtown Rd Sw, Marietta 30064 | (770) 514-8109 |
| Square One Technology Inc 4800 Township Rdg, Marietta 30066 | (770) 642-6126 |
| Santera Systems 3225 Shallowford Rd, Marietta 30062 | (770) 971-2499 |
| Alliance Systems Ltd 2265 Roswell Rd, Marietta 30062 | (770) 509-4864 |