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

FreeSWITCH audio, file, and stream formats


FreeSWITCH is able to interface automatically with a lot of codecs and file/stream formats, and it can translate between them. This means that a CD-like source at 48 khz, 16 bit, stereo and wideband will be decoded, downsampled, truncated, mixed, and then re-encoded to be sent in a G711 call.

Keeping with the general FreeSWITCH philosophy of do not reinvent the wheel, audio files and streams are read and written using open source libraries: FreeSWITCH has a specific API for audio formats; anyone can write a wrapper for a new sound format library and that format will be available everywhere in FS that a sound format is used (the same applies to codecs and to stream formats; just implement their FreeSWITCH's API).

This ensures the most efficient and timely support for new file formats and codecs (Brian West released FreeSWITCH's support for BroadVoice codec 40 minutes after it was open sourced).

Audio file formats

Most audio file formats are supported...