| Business | Phone |
| X O Communications Inc 89 Fulkerson St, Cambridge 2141 | (617) 621-9876 |
| France Telecom 124 Mount Auburn St, Cambridge 2138 | (617) 576-5701 |
| Broadwing Communications 101 Main St, Cambridge 2142 | (617) 350-6994 |
| Mci 300 Bent St, Cambridge 2141 | (617) 520-6500 |
| Level 3 300 Bent St, Cambridge 2141 | (617) 494-1372 |