| Business | Phone |
| Aspect Telecommunication 2 Elizabeth Dr, Chelmsford 1824 | (978) 367-1600 |
| Siemens Network Convergance 271 Mill Rd, Chelmsford 1824 | (978) 923-3200 |
| Com House Wireless 221 Chelmsford St, Chelmsford 1824 | (978) 256-0860 |
| Intermedia Communication 100 Apollo Dr, Chelmsford 1824 | (978) 606-2000 |