title: How to start RTP stream inside a SIP/SDP call
body: <p>I've managed to set up a SIP call using the JAIN-SIP API for Java.</p>
  
  <p>Now I would like to stream some video once a dialog has been established. I've read that this is possible with SDP and RTP, and I've found multiple examples on how to define a SDP/RTP body in a SIP packet.</p>
  
  <p>But once you have negotiated capability etc. on nodes, <strong>how do you actually start the RTP stream?</strong> Do you start an RTP streaming server outside or inside your Java application? If so, how? What is the link?</p>
  
  <p>In what I'm able to find online, nodes just "start exchanging RTP packets".</p>
  
  <p>Thank you.</p>