The QOS settings in the profile on the WLC does not mark packets, it simply allows packets that were marked by the client to keep it's markings up to a set level.
If you want Wireless Voice to work on your PC's.
1. Make sure that SSID is set to Platinum (Make sure Platinum is set to a value of 6).
2. Make sure CUCM is configured to use the desired DSCP values for call control and RTP traffic.
3. Trust DSCP on the switch port connecting to the on the AP.
The risk that you take here is that it allows an application on the PC to mark it's packets up to EF and it could chew up your entire priority queue on your network. This is why most people put the wireless phones on it's own SSID.
I hope this helps.
Scape