Book Image

Mastering FreeSWITCH

By : Russell Treleaven, Seven Du, Darren Schreiber, Ken Rice, Mike Jerris, Kalyani Kulkarni, Florent Krieg, Charles Bujold
4 (1)
Book Image

Mastering FreeSWITCH

4 (1)
By: Russell Treleaven, Seven Du, Darren Schreiber, Ken Rice, Mike Jerris, Kalyani Kulkarni, Florent Krieg, Charles Bujold

Overview of this book

FreeSWITCH is one of the best tools around if you’re looking for a modern method of managing communication protocols through a range of different media. From real-time browser communication with the WebRTC API to implementing VoIP (voice over internet protocol), with FreeSWITCH you’re in full control of your projects. This book shows you how to unlock its full potential – more than just a tutorial, it’s packed with plenty of tips and tricks to make it work for you. Written by members of the team who actually helped build FreeSWITCH, it will guide you through some of the newest features of version 1.6 including video transcoding and conferencing. Find out how FreeSWITCH interacts with other tools and APIs, learn how to tackle common (and not so common) challenges ranging from high availability to IVR development and programming advanced PBXs. Great communication functionality begins with FreeSWITCH – find out how and get your project up and running today.
Table of Contents (21 chapters)
Mastering FreeSWITCH
Credits
About the Authors
About the Reviewers
Contributors
www.PacktPub.com
Preface
7
WebRTC and Mod_Verto
Index

API command


API commands are the way to interact in real time with FreeSWITCH. You can use API commands to originate a call, to answer, to gather statistics, to write accounting data, to shutdown the entire system, and more.

API commands are commands you can type while you're connected to FreeSWITCH's console, or via fs_cli. You can send API commands by firing events, both from a module and via an ESL TCP connection.

Modules can add new such functionalities; actually, pretty much all API commands come from modules:

We registered our API command during the LOAD function, as per the dialplan application.

example_api() is the function that implements the API command. We use it as a demonstration of how to send an event from a module.

First, you create the event pointer, then you give it an earthly existence with switch_event_create(), passing the event-specific kind as an argument.

At this point you have an empty event, a skeleton event with only the standard minimal headers (fields). You can flesh...