title: identifying the DTMF tones in android
body: <p>I m planning to create a centrex system app in android. In which there is a voice mail will set in the receiver side. By the instructions in the voice mail, caller has to press the number in the dial pad, receiver side should identify the number and do the corresponding actions. Does anyone have any idea about how to detect the number pressed by the caller in receiver side?,
  What is the technology behind it?,
  Is it possible in android?</p>
  
  <p>Any help will be appreciable..</p>