First of all you need to install Incredible PBX. Simple instructions are here. I am using a VM built on Xenserver but any PC or VM should be able to work for you. Next you need to have a compatible Voice Gateway devices. I am using an old Linksys SPA-3102 which enables Voice over IP.
You will also need a half decent wireless phone system. I am using an AT&T dec system with 5 handsets
Pretty easy so far right?
Configure the SPA-3102 as follows:
Linksys SPA-3102 Admin Continued
Next goto your Incredible PBX admin screen http://phone1.local.net/admin
and add your google account under Connectivity / Google Voice
You now need to setup your connection to your Linksys SP-3102 under “Applications / Extensions”