| Business | Phone |
| J B Connexions 5 Mcintosh Dr, Markham L3R 8C8 | (905) 475-9555 |
| Lucent Technologies Canada 1380 Rodick Rd, Markham L3R 4G5 | (905) 943-5000 |
| Network Design & Analysis Corp 60 Gough Rd, Markham L3R 8X7 | (905) 477-9534 |
| Binary Wave Technologies Inc 60 Centurian Dr #217, Markham L3R 8T5 | (905) 940-6505 |
| Black Box Canada Corp 951 Denison St #1, Markham L3R 3W9 | (905) 474-1884 |
| Symtech Innovations Ltd 3980 - 14th Avenue, Unit 2, Markham L3R 0B1 | (905) 940-8044 |
| Datatec Systems Canada 215 Shields Crt #1, Markham L3R 8V2 | (905) 477-9977 |
| G N Nettest Inc 55 Renfrew Dr, Markham L3R 8H3 | (905) 479-8090 |