What phone for H650: Integrated Voice Network

[maarass@xxxxxxxxxxx]

Hi all, I did some searching here and got some good info. what I could
not find was a recommended phone/phone system for my OpenHouse H650:
Integrated Voice Network module. I got all their stuff which makes up
their premium package and am just now installing some modules. Basicaly
I'd like a simple setup to use with the H650. Does anyone know if just
any ole phone works or do I need something compatiable. Sorry for the
newbie questions, but this is starting to get overwelming. Thanks in
advance.