The Architecture of Open Source Applications. Architects look at thousands of buildings during their training, and study critiques of those buildings written by masters. In contrast, most software developers only ever get to know a handful of large programs well—usually programs they wrote themselves—and never study the great programs of history. As a result, they repeat one another's mistakes rather than building on one another's successes.

This book's goal is to change that. In it, the authors of twenty-five open source applications explain how their software is structured, and why. What are each program's major components? How do they interact? And what did their builders learn during their development? In answering these questions, the contributors to this book provide unique insights into how they think.

If you are a junior developer, and want to learn how your more experienced colleagues think, this book is the place to start. If you are an intermediate or senior developer, and want to see how your peers have solved hard design problems, this book can help you too.

Asterisk: The Definitive Guide [Book] By Jim Van Meggelen, Leif Madsen, Russell Bryant - O'Reilly Media (2011) - Paperback - 500 pages - ISBN 0596517343

Revised for the upcoming 1.8 release of the Asterisk open source PBX, this bestselling guide provides a complete roadmap for installing, configuring, and integrating this powerful software with existing phone systems. Asterisk: The Definitive Guide has everything you need to know to design a complete VoIP or analog system with little or no Asterisk experience, and no more than rudimentary telecommunications knowledge.