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

What can go wrong?


There are two completely separate flows in telecommunication: Signaling and media. They often take completely unrelated paths from caller to callee that is, their IP packets traverse different gateways and routers. Also, the two flows are managed by separate software (or by different parts of the same application) using different protocols. Signaling and media have nothing to do with each other; each one can work or fail independently from the other flow. But you need both to work correctly for your user to have a complete communication session.

Signaling is a flow of information that defines who is calling whom, taking which paths, and which technology is used to transmit which content. The most used signaling protocol in telecommunication is SIP. It defines the caller's IP address and port, the callee's IP address and port, and the IP addresses and ports of all intermediate servers that the signaling is sent through, and it also announces the various phases of call (begin...