Book Image

FreeSWITCH 1.8

By : Anthony Minessale II, Giovanni Maruzzelli
Book Image

FreeSWITCH 1.8

By: Anthony Minessale II, Giovanni Maruzzelli

Overview of this book

FreeSWITCH is an open source telephony platform designed to facilitate the creation of voice and chat-driven products, scaling from a soft-phone to a PBX and even up to an enterprise-class soft-switch. This book introduces FreeSWITCH to IT professionals who want to build their own telephony system. This book starts with a brief introduction to the latest version of FreeSWITCH. We then move on to the fundamentals and the new features added in version 1.6, showing you how to set up a basic system so you can make and receive phone calls, make calls between extensions, and utilize basic PBX functionality. Once you have a basic system in place, we’ll show you how to add more and more functionalities to it. You’ll learn to deploy the features on the system using unique techniques and tips to make it work better. Also, there are changes in the security-related components, which will affect the content in the book, so we will make that intact with the latest version. There are new support libraries introduced, such as SQLite, OpenSS, and more, which will make FreeSWITCH more efficient and add more functions to it. We’ll cover these in the new edition to make it more appealing for you.
Table of Contents (23 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Variables


Variables are everywhere in FreeSWITCH configuration and in FreeSWITCH working. Almost all things in FreeSWITCH happen because you set or change a variable. Also, all things that happen set and change FreeSWITCH variables.

An important aspect of channel variables (and of FreeSWITCH variables by and large) is that you use them not only to check the state of the system/call/user and so on,but you also use variables to affect the behavior of FreeSWITCH! (see later this chapter in "setting variables and call setup").

Here we will add and build on top of our previous expositions, passing in review various kind of variables you can use in dialplan conditions.

Global variables

Some global variables are set (and possibly calculated) automatically by FreeSWITCH at startup, like all the default directories in configuration, the IP addresses in use, NAT related infos, and so on.

These are:

  • hostname
  • local_ip_v4
  • local_mask_v4
  • local_ip_v6
  • switch_serial
  • base_dir
  • recordings_dir
  • sound_prefix
  • sounds_dir
  • conf_dir...