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The Future Of Telephony Is Now


The Definitive Guide


This is the online home of Asterisk: The Definitive Guide, a free book about Asterisk, an open source PBX platform that runs primarily on Linux. As you may have guessed from the layout of this page, this book is published by O'Reilly Media.

This is a place to read HTML version of the book (you can also buy a copy if you'd like to support the project). We'll do our best to keep the site up-to-date. As Asterisk development continues, it will continue to grow new features, and we plan to continue documenting those changes.

4TH EDITION RELEASED: The fourth edition of Asterisk: The Definitive Guide is now available for purchase! Order your physical copy today, or add the book to your virtual library using the Safari Books Online service.

Special Thanks

A special thanks to the Subversion book guys for publishing their website and build tools as open source for others to use!

Online Versions of the Book

Here is the third edition of the book (based on Asterisk 1.8) which is available online:

For Asterisk 1.8


For feedback on the book or this website, contact [Leif Madsen]. If you have spotted errors in the book (O'Reilly's hardcopy or otherwise), please do the following things:

  1. If the problem is in the published third edition book, check O'Reilly's errata page for the book, and report the error there if it hasn't already been reported.

Reports of errors in the book are always welcome. Reports of errors in the book which are accompanied by a suggested fix for the problem are even better :)

Leif Madsen,
Jim Van Meggelen,
& Russell Bryant