Thanks Ace. Have you hooked up 3rd party IP phones to the 5000? I would hope they work better than a single line / analog device.
Sure, plenty, Grandstream, Polycom, Algo, Aastra, SpectraLink, Yealink, etc... any generic SIP device will work, although to say they work better than a single line analog device could be debatable. If features are the key, use a MiNET (Mitel proprietary) phone.