title: Multiple DTMF digits
body: <p>I'm using restcomm-android-sdk and I'm wondering what is the proper way to send multiple DTMF.</p>
  
  <ol>
  <li><p>Can I send multiple DTMF digits in one INFO? (e.g. <code>DeviceImpl().GetInstance().SendDtmf("1234");</code>)</p></li>
  <li><p>Can I send multiple DTMF in separate INFO without waiting for the ACK first?</p></li>
  </ol>
  
  <p>My observation is that neither works properly, but I was not able to find (on Google) how to do this properly.</p>
  
  <p>What worked for me is to send one digit at a time and wait for ACK.
  Thanks for your input.</p>