VoIP

Our CTO has bravely rigged up some kind of VoIP system involving Google Voice, Gizmo5 (recently aquired by google) and an ATA... a) it'd be cool if there was some documentation on how this was done on here, or pointers to docs Adam used, if he has time to put them up. b) we still need to get the Hive dial-in/VoIP thing Adam put together in action, and c) Maybe it'd be cool to have an Asterisk and/or VoIP class to learn about this stuff? I'd like to rig up Gizmo5 as my home VoIP solution via google voice, as I miss Vonage but am too cheap and/or poor these days to pay their not-that-outrageous fees... free or almost free is more my speed :-)