Hi,
I suggest to use wav (SLIN) and WAV (GSM).
We have also a Wish already approved, to convert the audio file from the PBX Sound Settings,
with the right codec as soon as it's attached.
I would like to know what BackgroundHALShouldPause does, and how to use it. While it's listed in the HAL Primitives report, it is not used in source code and it doesn't appear in the LMS HAL...