if you are trying to watch this with VLC etc. then AFAIK no player will let you specify the referer parameter. however there is an open source project called Live555 which is related to rtsp streaming that you can try to modify for your requirements. however if you are trying to embed this stream into your website following code works fine
Code:
<html>
<body>
<object>
<embed height='350' width='400' type="application/x-mplayer2" src="http://www.arab-channels.tv/asx/orangetv.asx" name="MediaPlayer" </object>
</body>
</html>