To a big company, gaining or losing two hundred people is a rounding error. To a SMB, it represents a big change. Park’N Fly, an airport parking business with locations across Canada, faces that reality every year. Depending on the season, their number of employees can vary between 300 and 500. A business that nearly doubles and halves every year is faced with a unique challenged. Fortunately, smaller ISPs understand the kinds of challenges that scaling back and forth can bring. When Primus set up Park’N Fly’s new phone system, it was built to add or take away seats with ease.