baresip failed to set audio-source (Function not implemented)

[bhupiister]

The below line of code was the issue in my case. I had to change

    def convert_audio(input_file, outfile=None,ismp3=False):
        input_file = expanduser(input_file)
        sound = AudioSegment.from_file(input_file)
        sound += AudioSegment.silent(duration=500)
        # ensure minimum time
        # workaround baresip bug
        while sound.duration_seconds < 3:
            sound += AudioSegment.silent(duration=500)

        outfile = outfile or join(tempfile.gettempdir(), "pybaresip.wav")
        sound = sound.set_frame_rate(48000)
        sound = sound.set_channels(2)        
        sound.export(outfile, format="wav")
        return outfile, sound.duration_seconds

Making the frame rate and set_channel as below made it work

        sound = sound.set_frame_rate(8000)
        sound = sound.set_channels(1)

The problem may be related to the hardware, unable to play the device at higher frame rate.