title: How to check if the destination line has answered a call with porsip sdk on android
body: <p>With the Portsip manual, it says com.portsip.OnPortSIPEvent.onInviteAnswered will be triggered if the remote party answered the call. But what i've got so far is when A make a call to B, the onInviteAnswered callback is just immediately triggered on the A side without knowing that B has actually answered the call yet. </p>
  
  <p>Or this is the expected behavior please help.</p>