Audio Input Stream To IVR supported WAV file [JAVA]

Question

I want to convert audio InputStream to wav file format in java.

Require format is : mu-law 8000 Hz 64 kbps Mono

I am using the following method for the conversion but generated audio file is corrupted.

public static void getWavFile(String filePath, InputStream audioStream) throws IOException, UnsupportedAudioFileException {
    try {

        byte[] decodedData = IOUtils.toByteArray(audioStream);

        File outFile = new File(filePath);
        
        AudioFormat format = new AudioFormat(AudioFormat.Encoding.ALAW, 8000, 16, 2, 4, 8000, false);
                    
        AudioSystem.write(new AudioInputStream(new ByteArrayInputStream(decodedData), format, decodedData.length),
                AudioFileFormat.Type.WAVE, outFile);
        
    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

I am using this audio file to play in my IVR flow and it strictly allow only the given format.