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Unfortunately every browser supports a different format formats of audio filefiles. We can't just generate a wav file and expect all browsers to understand it. Here is a quick list of the different formats supported by different browsers (taken from


This is where the fun begins. Unfortunately due to licensing and legalities we are not able to distribute anything that makes MP3 or MP4 (M4A) files. However it's not illegal for you to compile the binaries for these programs yourself. After you've installed them FreePBX can transcode your audio files for you!

So what do I have to do?

There are different options for different types of files. After looking at the table above you need to decide what you want to support. After the libraries have been installed FreePBX will automatically detect them and use them to create files.