| Business | Phone |
| Inter-Tel Technologies 6600 Virginia Manor Rd, Beltsville 20705 | (301) 419-2727 |
| Reggie Reed 4415 Harbour Town Dr, Beltsville 20705 | (301) 586-8886 |
| Berliner Comm Inc 6608 Virginia Manor Rd, Beltsville 20705 | (301) 210-1114 |
| Telephone Corp Of America 6600 Virginia Manor Rd, Beltsville 20705 | (301) 210-1148 |
| Verizon Connected Solutions 11750 Beltsville Dr # 150, Beltsville 20705 | (301) 586-1100 |
| Go Direct Telecom Inc 11311 Somerset Ave # B, Beltsville 20705 | (301) 931-0422 |