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  • Book Overview & Buying Mastering FreeSWITCH
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Mastering FreeSWITCH

Mastering FreeSWITCH

By : Russell Treleaven, Seven Du, Schreiber, Ken Rice, Mike Jerris, Florent Krieg, Kalyani Kulkarni, Charles Bujold
4.2 (6)
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Mastering FreeSWITCH

Mastering FreeSWITCH

4.2 (6)
By: Russell Treleaven, Seven Du, Schreiber, Ken Rice, Mike Jerris, Florent Krieg, Kalyani Kulkarni, 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 (15 chapters)
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7
7. WebRTC and Mod_Verto
14
Index

Incoming call processing


At line 23 in the code we checked if the env array exists or is nil.

If env exists, the script is being executed as API hangup_hook, the call has been already hung up, there is no session (the call does not exist anymore), but all channel variables have been saved into env. We'll look into it in the next section.

If env does not exist then we know the script is called in normal mode, for example, there is an incoming call and a dialplan extension (in our case 2910, in welcome.xml) is calling the script:

Before answering

We are at line 54 right now. The code in the preceding screenshot begins by setting an input callback function. That would be a function that process DTMFs entered by the caller when there is no other DTMF processor in execution (for example, when we are directly playing an audio file, and not while we're playAndGetDigits a menu, see the following (voice menu processing).

Then we set a hangup hook function. Note that this is very different from api_hangup_hook...

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Mastering FreeSWITCH
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