You are reading Asterisk: The Future of Telephony (2nd Edition for Asterisk 1.4), by Jim van Meggelen, Jared Smith, and Leif Madsen.
This work is licensed under the Creative Commons Attribution-Noncommercial-No Derivative Works License v3.0.
To submit comments, corrections, or other contributions to the text, please visit http://www.oreilly.com/.