PBX In a flash is great and I think much cleaner than trixbox. They are also building it so upgrades aren't a huge pain. There are lots of cool scripts made for it too that install neat little extras.

However, in another thread about odd disconnects, there is some discussion about Asterisk 1.4 with VoipO disconnecting after 30 minutes. It apparently has something to do with session timers not being supported in Asterisk 1.4.

But, the PIAF ISO image allows you to install 1.4 or 1.6 beta, and the 1.6 beta does work with session timers. I haven't tried it yet personally but I plan to.

Scott