Asterisk Live! CD

Asterisk PBX is Linux based, open source PBX software that provides voice over IP in three protocols.

Version: 0.1.6
License: GPL
Operating System: Linux
Homepage: www.automated.it
Developed by: Andy Powell

Asterisk PBX is Linux based, open source PBX software that provides voice over IP in three protocols and is interoperable with most standards-based telephony equipment using comparatively inexpensive hardware.

If you want to play around with Asterisk check out this distribution which is available as a Live CD and a Compact Flash install.