hello,

With my nokia770 and orb, all is OK, but with a low bitrate like 76 kbps or like 72 kbps and only with Real media stream.
Don't forget to open your firewall
"For Real and 3GP Media: you need to be able to connect to TCP port 554 and UDP ports 13398 to 13401."
and open outgoing TCP ports 80,82, 85 and 86.
Orb support about firewall

Good luke