| Business | Phone |
| Alliance Security Systems 109 11th St W, Cornwall K6J 3A8 | (613) 937-4430 |
| Rangard Security & Electronics 433 Tollgate Rd W, Cornwall K6H 5R6 | (613) 938-1212 |
| Tri-Co Av Systems Ltd 506 2nd St W, Cornwall K6J 1H4 | (613) 932-5152 |
| Canpage Communications Ltd 408 Pitt St, Cornwall K6J 3R2 | (613) 938-3867 |