D-Link DSL-2740B User Manual page 51

Section 3 – Configurations
WIRELESS QOS
WMM is used to prioritize the data packets from to/from WLAN.
It is very useful when transmitting delay-sensitive packets like
VoIP.
You can select Enabled or Disabled to decide if you want to
use WMM.
Please press the Apply button to take it effect.
D-Link DSL-2640B User Manual 51