title: play_and_get_digits no input vs wrong input in Freeswitch
body: <p>I am trying to implement the play_and_get_digits using ESL in nodejs.</p>
  <p>The code is quite simple:</p>
  <pre><code> conn.execute('play_and_get_digits', ${minValue} ${maxValue} ${tries} ${timeout} ${terminator} ${soundFile} ${invalidFile} ${var_name} ${regex} ${digit_timeout}`);
  </code></pre>
  <p>It works well. My only problem is when the caller does not enter anything. By default, it plays the audio defined in <strong>invalidFile</strong> which I use to inform the caller the value they entered is not valid. I would like to be able to differentiate between wrong input (e.g. digit 5 when only 1 or 2 are allowed) and no input at all.</p>
  <p>What would the best way to do this be?</p>
  <p>Thanks!</p>