We were quoted an upgrade to a Shortel from ATT, but the owner doesn't want to spend the money there and see the useful equipment we currently have go to waste. Is there an easy upgrade path from a 50 to 450 or would it be easier to start from scratch? I've seen a couple documents but they all had higher releases, we are on 1. I've tried contacting a few local places but no one wants to return calls, so I am on my own currently as to figuring out a solution.