Slapin, I really don't want to get into a debate on this but I can't resist.
The Blackberry is causing the interferance, why do you think it is the responsibilty Mitel to shield themselves from it?
Comparing a common desktop phone to a Polycom conference unit is apples and oranges.
*******************************************************
Occam's Razor - All things being equal, the simplest solution is the right one.