Thanks for the quick reply! Thus far they've used POTS wireless phones. Only managers would need IP phones, so probably two or three per location. The sales floor would probably use a POTS wireless base connected to an analog port so they have floating handsets on the sales floor. Also I should mention I already have a site-to-site VPN set up so you can ping a local IP address in the correct subnet and get the remote device's response. As I understand it Mitel counts that as an 'IP trunk license' for each call traversing that IP address at a time. I plan to not use the WAN port on the controllers.

Hackbarth Communications, L.L.C. - Serving South Central Wisconsin's Telecom Needs