I just began reading about VoIP as I might have to implement a system soon. I kind of dream of setting up an Asterisk server, probably using the asterisk@home project (apparently based on CentOS!). I also discovered a very nice site about VoIP. I have many choice... Regular Telco lines, Meridian system, A mix of IP/Telco lines, or an Asterisk server with either only an IP connection a (DID, i think), Telco lines, or a mix. I've been shopping around and up to now the most responsive business is Netfone. If anyone has recommendations for me, please let me know.