I believe you will need a Session Initiation Protocol . libvlc supports this type of Uri, so it must have one.
I believe that you would use the Uri scheme "rtp: //" or "sip: //" depending on the device in combination with the Open Network option in the Vlc interface. (where you should enter uri)
Edit:
, sdp , "", . 'a = control: rtsp://' ..
, .