title: Looking for a SIP client that can use an h.264 RTSP stream as a video source
body: <p>We are looking to integrate an IP camera (h.264 RTSP stream) with an asterisk PBX system for use in a school for distributed education (so a remote teacher can "dial in and teach").</p>
  
  <p>Ideally we would like to be able to create a SIP client as an autoanswer pbx extension.</p>
  
  <p>We are considering running a *nix box that can use a network video stream as a source for video, mix a separate audio source and present a SIP endpoint.</p>
  
  <p>I understand that <a href="http://www.iptel.org/ser" rel="nofollow">SIP express router</a> may be able to:</p>
  
  <p>"call an external C script, which could parse and change the SDP info within the SIP headers of clients it porxy's with, and change address of where it expects to recieve media from."</p>
  
  <p>but I'm thinking it may be easier to look for a way to present an h.264 rtsp stream as /dev/videoX and use a standard SIP client. </p>
  
  <p>If anyone has any pointers or any ideas for research I'd be really appreciative :-)</p>
  
  <p>Thanks for reading!</p>
  
  <p>W</p>
  
  <p>p.s. there are IP cameras out there that claim to have SIP clients, but all I have seen only offer SIP for establishing a bi-directional audio session.</p>