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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
Languages
Concepts
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
View More author details
Toc

Table of Contents (21) Chapters close

Mastering FreeSWITCH
Credits
About the Authors
About the Reviewers
Contributors
www.PacktPub.com
Preface
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

Various important features


Fax transmission has been designed and optimized to fully exploit the physical characteristics of traditional PSTN analogical copper lines, and has been the bête noire of VoIP for a long time. Even the best, uncompressed codecs (G711) are not able to guarantee a high success rate of T30 (for example, fax) transmissions. That's because of the hyperstrict timing requirements that were guaranteed by a real-time analogical transmission, but are practically impossible for an asynchronous digital transmission. We'll see this in a later section of this book, but the SIP solution to this problem is a protocol enhancement called T38. T38 works around the timing problems, but its implementation must be compatible end to end, and the eventual gateway to PSTN connected fax machines must be of high quality.

So, if you need faxes (inbound and/or outbound), choose an ITSP with well–known, good T38 support for routing this kind of traffic, and perform many tests before committing...

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