Draytek Vigor2920 Series User Manual page 279

Available settings are explained as follows:
Item
Enable
Use Default Setting
Enable (for Application)
Description
Click Enable to activate APP QoS function.
Click Disable to deactivate APP QoS function.
The packets will be transmitted with the default settings. That
is, VoIP packets will be the first to be sent out and P2P packets
will be the last to be sent out.
There are four applications (VoIP, Streaming, IM, Tunneling,
Remote Control, Web HD and P2P) which can be specified
with different QoS Class.
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Vigor2920 Series User's Guide