title: Low volume in call recording (Rx)
body: <p>I do the following test:</p>
  
  <p>Call from android app phone to home phone, first speak from (android phone - > home phone), in the same call speak from (home phone-> android phone).</p>
  
  <p>The voice (android phone - > home phone) sounds in good volume (10/10 volume). But the voice (home phone-> android phone) sounds very low (4/10 volume).</p>
  
  <p>I do the same test with random <a href="https://play.google.com/store/apps/details?id=il.co.smedia.callrecorder.yoni&amp;hl=es" rel="nofollow">call recording app in play store</a> The voice (android phone - > home phone) sounds in good volume (10/10 volume). The voice (home phone-> android phone) sounds in good volume (10/10 volume)</p>
  
  <p>I try to call record which:</p>
  
  <p>1)</p>
  
  <blockquote>
    <p>audioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);</p>
  </blockquote>
  
  <p>2)</p>
  
  <blockquote>
    <p>audioRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_COMMUNICATION)</p>
  </blockquote>
  
  <p>3)</p>
  
  <blockquote>
    <p>audioRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL)</p>
  </blockquote>
  
  <p>With 1, 2 o 3 results are very similar.</p>
  
  <p>I also try to up VOICE_CALL stream if AudioSource.VOICE_CALL is used like this:</p>
  
  <pre><code>audioManager manager = (AudioManager) ServiceClass
                      .getServiceContext()
                      .getSystemService(Context.AUDIO_SERVICE);
  
  manager.setStreamVolume(AudioManager.STREAM_VOICE_CALL,
                      manager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL),
                      AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);
  </code></pre>
  
  <p>Does the application I have tried in the Play Store process the audio in some way to turn up the volume?</p>
  
  <p>I don´t show here audio quality set code because in both test (my app test, play store app test) the audio (android phone - > home phone) sounds exactly the same, the problem is (home phone-> android phone)</p>