if(!conv.surface.capabilities.has('actions.capability.MEDIA_RESPONSE_AUDIO')) {
  conv.ask('Sorry, this device does not support audio playback.');
}
else{
  conv.ask(new MediaObject({
    name: 'Radio one',
    url: 'my_streaming_url.mp3',
    description: 'A funky Jazz tune',
  }));
  conv.ask(new Suggestions(['Radio two']));
}