Switching to VoIP

This is the Title of the Book, eMatter Edition

Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.

Preface

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xix

Where to Get More

There are 1,000-page books about telephone systems, and there are 50-page refer-

ence pamphlets about a single protocol, like SIP. When writing a book like this, it’s a

challenge to strike a balance between the unwieldy tome that’s filled with countless

details of trivial import and a crash-course FAQ that tells you just enough to get

started. On one hand, there’s nebulous reference material, and on the other, there’s

not enough detail but lots of conciseness.

To address this, the book is rather detailed on certain subjects and rather brief and

concise on others. If you’re looking for more information in a special area, O’Reilly

offers other books that may help you, including narrow but detailed books about

T1 circuits, data communications theory, network security, and Ethernet. Safari

Online is O’Reilly’s web-based library of books, an invaluable tool that can also

provide more depth. Information on O’Reilly’s printed books and Safari are avail-

able at http://www.oreilly.com.

Safari Enabled

When you see a Safari® Enabled icon on the cover of your favorite tech-

nology book, it means the book is available online through the O’Reilly

Network Safari Bookshelf.

Safari offers a solution that’s better than e-books. It’s a virtual library that lets you

easily search ...