D-Link DWL-3600AP Administrator's Manual page 178

Unified Access Point Administrator's Guide Configuring Client QoS
10. For the class_voip class map, select the IP DSCP option, and then select ef from the Select From List menu.
11. Traffic that meets the criteria defined in the class_voip class is marked with a DSCP value of EF (expedited
forwarding).
12. Click Apply to save the policy.
13. Navigate to the Client QoS > VAP QoS Parameters page.
14. Select VAP 2 from the VAP menu.
15. Make sure that the Client QoS Global Admin Mode and the QoS Mode are both enabled.
16. From the DiffServ Policy Up menu, select pol_voip.
D-Link Unified Access Point Administrator's Guide
November 2011 Page 178