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

Fax and FreeSWITCH


Receiving and sending a fax in FreeSWITCH is excruciatingly simple, consisting of two applications:

  • rxfax (/path/where/to/write/TIFF)

  • txfax (/path/where/to/read/TIFF)

That's it. Isn't that a beauty? Thanks to the world-class work of Steve Underwood, the recognized Godfather of Digital Signal Processing, SpanDSP library is integrated into FreeSWITCH and, amid many other goodies, provides complete T30 and T38 fax communication support.

Note

FreeSWITCH sends and receives TIFF files. You must do all the necessary conversions (to/from PDF, and so on).

All the finer details of fax communication are determined by a mod_spandsp configuration file (overridable runtime for each application invocation) and by information contained in the TIFF file itself (for example, resolution, size, color or b/w, and so on). Again, mod_spandsp configuration (overridable) determines if and how a T38 call upgrade will be attempted, and T38 terminal or gateway behavior to/from T30 and TDM (PSTN).

The mod_spandsp...