Media Reception using RTPManager
The steps involved in receiving media streams using a
RTPManager are as follows.
Construct an instance of a RTPManager,
Ø RTPManager.newInstance();
Initialize RTPManager with a local transport end point,
Ø rtpManager.initialize( localaddr);
Add a ReceiveStreamListener  to the RTPManager that can
receive and handle the media stream(s).
Ø rtpManager.addReceiveStreamListener( receiver );
Specify the remote transport end point(s).
Ø rtpManager.addTarget( remoteAddr );
Handle    NewReceiveStreamEvent
Get DataSource from media stream - stream.getDataSource();
Construct Player / Processor from DataSource