I set up Asterisk @ Home a couple years ago to test on a home network. Forgotten most of it though.
Anybody using Asterisk Open PBX
Still a great system. Using as a SIP server. Might switch to H.323 though...
arrogance breeds ignorance
Screaming Electron, Full of BSD Goodness
I think my friend has one up....
I'd recommend downloading the adminsparadise VoIP and FAX iso.
It sets up and configures asterisk with web based management for you so the installation is a breeze.
They have a livecd to test and an installation cd that does the work for you.
It has web based faxing
Music on hold
roaming users, paging, parking etc.
flash based tutorials to walk you through it.
it's killer -- if you want the most features with an easy to use web interface this is the way to go.