Base64 encode function

Does the base64 encode works only on strings? or any mp3 file can also be encoded? Or is there any way to directly save the MixMonitor audio file into a base64 format file?

Obviously not, as all the functions work as part of macro expansion of the dialplan action.

MP3 is not an efficient format for phone calls, especially if used with default parameters.

Asterisk used not to support direct recording in MP3, but I suppose that might have changed.

You will need to post process the file, at the end of the call, typically using a Linux shell level encoder.

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