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Mastering FreeSWITCH

You're reading from  Mastering FreeSWITCH

Product type Book
Published in Jul 2016
Publisher Packt
ISBN-13 9781784398880
Pages 300 pages
Edition 1st Edition
Authors (8):
Russell Treleaven Russell Treleaven
Profile icon Russell Treleaven
Seven Du Seven Du
Profile icon Seven Du
Darren Schreiber Darren Schreiber
Profile icon Darren Schreiber
Ken Rice Ken Rice
Profile icon Ken Rice
Mike Jerris Mike Jerris
Profile icon Mike Jerris
Kalyani Kulkarni Kalyani Kulkarni
Profile icon Kalyani Kulkarni
Florent Krieg Florent Krieg
Profile icon Florent Krieg
Charles Bujold Charles Bujold
Profile icon Charles Bujold
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Table of Contents (21) Chapters close

Mastering FreeSWITCH
About the Authors
About the Reviewers
1. Typical Voice Uses for FreeSWITCH 2. Deploying FreeSWITCH 3. ITSP and Voice Codecs Optimization 4. VoIP Security 5. Audio File and Streaming Formats, Music on Hold, Recording Calls 6. PSTN and TDM 7. WebRTC and Mod_Verto 8. Audio and Video Conferencing 9. Faxing and T38 10. Advanced IVR with Lua 11. Write Your FreeSWITCH Module in C 12. Tracing and Debugging VoIP 13. Homer, Monitoring and Troubleshooting Your Communication Platform 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.


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...

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