Home-Based, LAN-Capable, PC Phone Answering Machines?

jqh1 asks: "I have a voice capable modem somewhere around here -- I've dabbled in Windows based answering machine software without success and now use a plain old answering machine (the frustrating kind). I have a 100mbs home network that includes a linux box right next to a phone jack. What's the best way to rig up a reliable answering machine system on that box, and rig it so that message are accessible from any other computer (incl. some windows boxen). I have some half baked ideas (using audix-type software and samba), but I'd love to hear suggestions."