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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

What is Fax on PSTN?


Fax is scanning an image at one end of the communication, and sending the result to the other end, where it will be transformed back into an image.

However impossible it might seem, faxing was invented and patented before voice telephony. The first commercial faxing service was introduced in 1865 between Paris and Lyon. The first desktop fax machine for end users was introduced in 1948, while the 80s saw mass market distribution of compact fax machines very similar and completely compatible with today's models.

Every office still has a fax machine, or a fax server. Modern faxing is governed by the International Telecommunication Union (ITU) standard T30, which is ubiquitous, very reliable (that is, 99% or better completion rates between fax machines connected to PSTN), and is required by law for many legal document transmissions in many countries.

How it works

On a standard PSTN-transmitting fax machine, an image is scanned, the result is converted into TIFF digital image...

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