JMF RTP API
RTP session: A collection of participants exchanging media
using the RTP constitutes a RTP session.
Participant : abstracts an application that sends and / or
receives RTP encoded stream in a RTP session.
Ř local and remote participants.
Ř Identified by a CNAME( cononical name)
RTPManager :Each participant use a RTPManager object
to  co-ordinates the RTPsession on participant’s behalf..
RTPStream  : defines a media stream exchanged in a RTP
session. ReceiveStream and SendStream.
SessionAddress : a transport level end-point in JMF RTP API.
Ř Has the InetAddress and port number to be used by the RTP for
the data transfer
Ř the InetAddress and port number to be used by the RTCP for the
purpose of control.