Rating: 

I am currently in the process of building my Asterisk PBX and see what its potential is. This book has guided me through the entire process. I must hand it to the authors, they took a step back and paid close attention to detail and the basics. However, the further you read on, you begin to really understand the capabilities of this powerful software.

If you are a beginner or an advanced user, this book is surely to teach you something. Thank you to the authors who have opened my eyes to the breakthrough technology of VOIP.