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Building Telephony Systems with Asterisk

An easy introduction to using and configuring Asterisk to build feature-rich telephony systems for small and medium businesses

DavidGomillion Barrie Dempster


Building Telephony Systems with Asterisk
Copyright © 2005 Packt Publishing All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, Packt Publishing, nor its dealers or distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. PacktPublishing has endeavored to provide trademark information about all the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. First published: September 2005 First reprint: February 2006 Production Reference: 1010206 Published by Packt Publishing Ltd. 32 Lincoln Road Olton Birmingham, B27 6PA, UK.ISBN 1-904811-15-9

Cover Design by

Authors David Gomillion Barrie Dempster Reviewers Rob Clews Barrie Dempster Alex Epshteyn David Gomillion Jan Kolasinski Technical Editors Richard Deeson Niranjan Jahagirdar Editorial Manager Dipali Chittar Development Editor Louay Fatoohi Indexer Niranjan Jahagirdar Proofreader Chris Smith Production CoordinatorManjiri Nadkarni Cover Designer Helen Wood

About the Reviewers
Alex Epshteyn is the developer of Asterisk PBX Manager (a Webmin module for Asterisk) and the founding principal of Third Lane Technologies, LLC, a company specializing in VoIP software development and Asterisk consulting. Rob Clews' first affair with a computer was with a Dragon 64. Since then he has become an avid developer andsupporter of open-source software. Meeting Jan, he has founded Bluetel Solutions where he can stretch technologies to their limits and find the most efficient way to write and architect code to achieve the best results.
In what seems like a past life, Jan Kolasinski was a publisher for Wrox Press leading its Professional team. Since then he has been helping a number of small and medium sizedcompanies apply technologies. In order to formalize this he has founded, with Rob, Bluetel Solutions where he tries to find new ways to help clients achieve better return on investments. Rob is the second reviewer.

About the Authors
Barrie Dempster was a Network Administrator/IT Manager for a growing call center
when he saw the convergence and dependence of telephony and IT-related fields on eachother. He focused on integration of telephony with IT infrastructure, and took on security as a career. The increase of voice-over-IP communications has now led to high demand for these skills, which he now utilizes in his current position as a Scotland-based Infrastructure and Security consultant for a variety of clients primarily within the financial sector. He has been involved in varied...
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