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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
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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

Reacting to channel state changes


FreeSWITCH channels are always, deterministically, in one specific state of a finite state machine. There are rules for going from one state to another, and you can ask FreeSWITCH core to alert your module whenever a channel changes state.

There are 12 states a channel can be in (init, routing, execute, hangup, exchange_media, soft_execute, consume_media, hibernate, reset, park, reporting, destroy), plus the state none, which a channel is supposed to never assume.

State changes are important moments, particularly for billing and accounting (start of media flows, hangup), but you may want to trigger some procedures in other cases too, for example, when a channel is parked.

Our implementation first declares which state changes we want to deal with (LOAD function will register this table with FreeSWITCH core), INIT, and HANGUP.

Then it defines the function we'll use to react to those changes (you can have different functions for each state). Inside the function...

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