| Business | Phone |
| Phoneline Inc 5 Louis Edward Ct, Cockysvl Hnt Vly 21030 | (410) 493-6900 |
| Lisn 101 Schilling Cir, Cockysvl Hnt Vly 21031 | (410) 308-9100 |
| Lucent Technologies 225 Schilling Cir, Cockysvl Hnt Vly 21031 | (410) 584-1234 |
| Voice Net Technologies 10534 York Rd, Cockysvl Hnt Vly 21030 | (410) 667-4770 |