Asterisk - the future of telephony: join the open source PBX revolution. - Jim van Meggelen; Jared Smith; Leif Madsen (O'Reilly, 2005)

Asterisk - the future of telephony: join the open source PBX revolution: covers Asterisk 1.4 (2. ed.). - Jim van Meggelen; Leif Madsen; Jared Smith (O'Reilly, 2007)

Asterisk - The Definitive Guide: The Future of Telephony is Now: Covers Asterisk 1.8 (3. ed.). - Leif Madsen; Jim van Meggelen; Russell Bryant (O'Reilly, 2011)