title: sendDtmf on Xoom WiFI / Android 3.0
body: <p>Does the « sendDtmf » method from « SipAudioCall » class really work
  on Android 3.0 / Motorola Xoom WiFi ?</p>
  
  <p>I am developping a SIP activated application for Android 3.0 tablets
  and testing it on Motorola Xoom WiFi (no 3G nor 4G)</p>
  
  <p>I am able to :
  - create a « SipManager » with « SipManager.newInstance() »
  - use « manageurSip.makeAudioCall() » to retrieve my voicemail in my
  SIP provider account
  - in the « onCallEstablished » callback, I can use « startAudio() »
  and « setSpeakerMode(true) », to hear messages</p>
  
  <p>But when I try to use « sendDtmf(int) » to save or delete my messages,
  nothing happens.</p>
  
  <p>If I try to use an already developped SIP application "CSIPSimple", I
  am also unable to send DTMF tones.</p>
  
  <p>Should I wait for Android 3.1 to use this feature ?</p>
  
  <p>Thank you in advance. </p>