Has anyone tried using the IPECS 8012 phones on the MBX system, or is there any IP phones compatible with the MBX system besides vertical 8000 series phones?

There is the new Edge 9000 series of ip phones. They are on Vertical's website. Then again they are for the Summit 80 and 800 which used to be the MBX so I don't know for sure. The 7000 series of Ip phones should work, they have been around for awhile.

Thanks Derrick,
IPecs is the actual manufacturer of the MBX/SBX vertical just re-branded and added there own firmware. I would suspect the IPECS phones would not boot to the system due to firmware changes.