Asterisk: The Definitive Guide (Definitive Guides)
by Leif Madsen,Jim Van Meggelen,Russell Bryant
ISBN 13: 9780596517342
Format: Paperback (736 pages) Publisher: O'Reilly Media Published: 05 May 2011
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Asterisk: The Future of Telephony
by Jim Van Meggelen,Jared Smith,Leif Madsen
ISBN 13: 9780596009625
Format: Paperback (408 pages) Publisher: O'Reilly Media Published: 16 Sep 2005