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Originally posted by CountyTech:
with the buildings connected by LAN/WAN wireless radio links.
This is the part of the post that most concerns me. If you said you had a fiber backbone to each of the buildings IP may be the answer. But I would lean to IP Net Trunking on a converged PBX. That way if the network was down you would still be able to take and make calls on local trunks in local switches.