Chapter 1, Routing Calls, shows that getting calls from one endpoint to another is the primary function of FreeSWITCH. This chapter discusses techniques of efficiently routing calls between phones and service providers.

Chapter 2, Connecting Telephones and Service Providers, assists in quickly getting your FreeSWITCH server connected to other VoIP devices. Telephones and service providers have specific requirements for connecting to FreeSWITCH.

Chapter 3, Processing Call Detail Records, discusses a number of ways to extract CDR data from your FreeSWITCH server. Call detail records, or CDRs, are very important for businesses.

Chapter 4, External Control, presents a number of real-world examples of controlling FreeSWITCH from an external process. FreeSWITCH can be controlled externally by the powerful and versatile event socket interface.

Chapter 5, PBX Functionality, is the largest chapter in this book. This chapter shows how to deploy features such as voicemail, conference calls, faxing, IVRs, and more, which most telephone systems have, in a FreeSWITCH server.

Chapter 6, WebRTC and Mod_Verto, features the new disruptive technology that allows real-time audio/video/data-secure communication from hundreds of millions of browsers. FreeSWITCH is ready to serve as a gateway and an application server.

Chapter 7, Dialplan Scripting with Lua, covers Lua, the scripting language of choice for programming complex logic in FreeSWITCH. Accessing databases, calling web servers, and interacting with user's choices now becomes easy.