QoS: How to classify RDP traffic?

Hi All,

I am trying to classify RDP traffic to mark it with a DSCP value but I 
can't seem to get my ACL to pick it up. The router is a Cisco 877 and I 
can't see an RDP option using NBAR either.

I have tried the following with no luck:

  permit tcp any eq 3389 any eq 3389
  permit tcp any any eq 3389
  permit tcp any eq 3389 any

Can anyone think of a way to classify RDP traffic?

Kind Regards

Peter