How can I enable realnetworks streaming at the firewall?

[meastaugh1]

I've recently had a Fortinet Fortigate 300A (transparent firewall/web filter) installed as part of our grid's proxy software refresh. This sits in between our LAN and the router which connects to us to the grid (HGfL).

 

I have ports 80 and 443 to allow outbound access to the internet. I've also tried allowing the RAUDIO service, which I believe opens up TCP7070. Having trawled the internet, I tried opening 4040, 6970-7170, 8080, 554 etc.

 

The only way I seem to be able to get it to work is to create a service where the source TCP port is 1000-9999 and the destination port is 554.

Is this the only way to do it, or is there a tighter way of allowing RealNetworks streaming media? Thanks