title: Is it possible to detect rejected calls in Android?
body: <p>In my application, it would be nice to intercept when the user rejects a call, i.e. choose to send busy tone. 
  Is there any way, besides being notified when there is an incoming call, to do this?
  I have not found anything in the docs regarding this. 
  Is this information stored in the call log, i.e. can I poll the call log to see if a call was rejected or answered?</p>