Title: Asterisk: The Future of Telephony
Author: Jim Van Meggelen, Jared Smith & Leif Madsen
Published: 2005 by O'Reilly
I've been playing with Asterisk for about a year, and I've been interested in it for twice that, pretty much since I started working with proprietary PBX systems. First was a Nortel, and now a Vodavi and an NEC. I can't understate the symplicity of having a computer-controlled (especially a Linux-based one) phone system.