title: webRTC timestamp information
body: <p>I am working on a school project that uses webRTC. Webrtc uses rtp to payload data when sending video or audio. In the RTP specifications, it seems clear that a timestamp is used to reorder received packet when playing it.
  Is there any way to access to this timestamp information? Isn't it the subject of this <a href="http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time" rel="nofollow">API</a>?
  Our aim would be for the receiver of a media stream to tell the delay between him playing the stream and the time it was sent.</p>
  
  <p>If you can help me or tell me where to find the information, it would be really useful.</p>