title: Android Native SIP DTMF
body: <p>I am using <code>android SIP(android.net.sip)</code> for <code>VOIP</code> calling. Trying to send DTMF. In <code>SipAudioCall</code> Class of android two method has been given</p>
  
  <pre><code>void sendDtmf(int code, Message result)
  Sends a DTMF code.
  
  void sendDtmf(int code)
  Sends a DTMF code.
  </code></pre>
  
  <p>I am thinking to use <code>sendDtmf(int code)</code> method to send DMTF. but I dont know how can I varify whether It is actually sent or not. After implementing this, I am not getting any tone at reciever/sender side. Calling to this giving me no effect (As its background processing is not visible ). Can anyone please let me know how can I varify the same? Also please explain me usage of second method <code>sendDtmf(int code, Message result)</code>.</p>