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

Important dialplan applications


FreeSWITCH has many (hundreds) applications available for dialplan and scripting usage. Most of them are provided by mod_dp_tools, but almost every FreeSWITCH modules adds some applications to your toolbox.

Let's review some of the most popular building blocks, the ones you can start to experiment with immediately.

answer

The answer application picks up the phone by establishing a media stream to the calling party. In SIP terms, this causes FreeSWITCH to send a "200 OK" message, negotiate the audio/video codecs to use (if not already determined), and begin the flow of RTP packets.

Example:

<action application="answer"/> 

bridge

The bridge application originate new call(s) as B-leg(s), and connects (mixes, bridges) the media streams of the newly originated B-leg(s) to the streams of the incoming call (also known as A-leg)

Argument syntax:

bridge data="<dialstring>[,<dialstring>][|<dialstring>]" 

Dialstrings separated by commas are executed simultaneously...