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Matt Fredrickson (Director of Asterisk Engineering,
Sangoma/Digium)
I have had the opportunity to work with Asterisk for the last 18 years, and have seen
it grow from a small project with one or two people into something that has a life of
its own with hundreds of contributors. It’s amazing to see the number of different
places it has disrupted traditional telecom—at home, in the office, and in the enter‐
prise. As traditional communication patterns shift, the Asterisk project continues to
be in the place where it does best—bridging old forms of communication with the
new, and pushing the boundaries of what can be done with the new. This book will
help you see the most modern face of Asterisk and how to better utilize it in your
telecommunications infrastructure. Huge thanks goes to Jim Van Meggelen for all the
hard work on putting this most current edition together.
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Foreword
Preface
This is a book for anyone who uses Asterisk.
Asterisk is an open source, converged telephony platform, which is designed primar‐
ily to run on Linux. Asterisk combines more than 100 years of telephony knowledge
into a robust suite of tightly integrated telecommunications applications. The power
of Asterisk lies in its customizable nature, complemented by unmatched standards
compliance. No other private branch exchange (PBX) can be deployed in so many
creative ways.
Applications such as voicemail, hosted conferencing, call queuing and agents, music
on hold, and call parking are all standard features built right into the software. More‐
over, Asterisk can integrate with other business technologies in ways that closed, pro‐
prietary PBXs can scarcely dream of.
Asterisk can appear quite daunting and complex to a new user, which is why docu‐
mentation is so important to its growth. Documentation lowers the barrier to entry
and helps people contemplate the possibilities.
Produced with the generous support of O’Reilly Media, Asterisk: The Definitive Guide
is the fifth edition of what was formerly called Asterisk: The Future of Telephony.
This book was written for, and by, members of the Asterisk community.
Audience
This book is intended to be gentle toward those new to Asterisk, but we assume that
you’re familiar with basic Linux administration, networking, and other IT disciplines.
If not, we encourage you to explore the vast and wonderful library of books that
O’Reilly publishes on these subjects. We also assume you’re fairly new to telecommu‐
nications (both traditional switched telephony and the new world of Voice over IP).
xvii
However, this book will also be useful for the more experienced Asterisk administra‐
tor. We ourselves use the book as a reference for features that we haven’t used for a
while.
Software
This book is focused on documenting Asterisk version 16; however, many of the con‐
ventions and much of the information in this book is version-agnostic. Linux is the
operating system we have run and tested Asterisk on, and we have documented
installation instructions for CentOS (Red Hat Enterprise Linux, or RHEL).
Conventions Used in This Book
The following typographical conventions are used in this book:
Italic
Indicates new terms, URLs, email addresses, filenames, file extensions, path‐
names, directories, and package names, as well as Unix utilities, commands,
modules, parameters, and arguments.
Constant width
Used to display code samples, file contents, command-line interactions, database
commands, library names, and options.
Constant width bold
Indicates commands or other text that should be typed literally by the user. Also
used for emphasis in code.
Constant width italic
Shows text that should be replaced with user-supplied values.
[ Keywords and other stuff ]
Indicates optional keywords and arguments.
{ choice-1 | choice-2 }
Signifies either choice-1 or choice-2.
This element signifies a tip or suggestion.
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| Preface