Still have that old box in your closet?  Writing large checks every year to support a system that is lacking if features and reliability?
Supportphone offers a focused variety of Cloud/Host and Premise-based IP PBX products.

If you have under 400 handsets, then you should consider our Cloud/Hosted PBX system.  Outside of your handset cost, there are no heavy systems to purchase.  Your calls are terminated and PBX functions in the Cloud.  Calls are delivered using VoIP to your handsets, with no relation to geographic location!  Cancel your expensive PRI lines, cancel your expensive Long Distance contracts.  Supportphone offers flat-rate to unlimited Local/Domestic LD calling packages.  Typically, your up front costs are 40% less than a premise-based system, and your monthly costs are less than your existing telephone line costs.