title: Sip call not properly ended using sipstack
body: <p>I used the Android built-in sip library to write an app that makes calls via my server. The calls are being made correctly, but most of the time, the calls aren't ended correctly.</p>
  
  <p>This is my code to end the call:</p>
  
  <pre><code>public void stopCalling(){
      try {
          call.endCall();
          call.close();
      } catch (SipException e) {
          e.printStackTrace();
      }
  }
  </code></pre>
  
  <p>But it does not Ended properly. Is there any other way to ended the sip call.</p>