A must have if you work with VoIP

Even if the book is not perfectly written, in the sense that there are some typos and some glitches in the explanations, it is still a wonderful source to learn Asterisk configuration.
The book alone won't do everything for you, you'll need to read all sample configuration files from Asterisk installation, check as many pages as you can from voip-info.org, and play with configurations as much as possible. So, the book is about one fourth and the friendliest portion of what you need to master Asterisk. Go for it.

Other Reviews

• A must have if you work with VoIP
• Disorganized, a lot of typos
• Finally, a cohesive overview of Asterisk
• Disorganized, incomplete
• Very good reference for Asterisk