Anthony Minessale II & Giovanni Maruzzelli 
Freeswitch 1.6 Cookbook [EPUB ebook] 
Over 45 practical recipes to empower you with the latest FreeSWITCH 1.6 features

Free SWITCH 1.6 Cookbook is written for anyone who wants to learn more about using Free SWITCH in production. The information is presented in such a way that you can get up and running quickly. The cookbook approach eschews much of the foundational concepts, and instead focuses on discrete examples that illustrate specific features. If you need to implement a particular feature as quickly as possible, then this book is for you.