Draytek Vigor2912 Series User Manual page 71

Assuming you get 2MB/512Kb Internet line. You can click the Setup link of WAN1 to
9.
set up the bandwidth for different groups among VoIP, IPTV and Data/Email.
10. In the Setup page, check the box of Enable the QoS Control. Type 30, 50 and 15 in the
boxes for VoIP, IPTV and Data/Email respectively. Check the box of Enable UDP
Bandwidth Control.
11. Click OK to save the settings. The class rules for WAN1 are defined as shown below.
61 Vigor2912 Series User's Guide