The QoS function in DrayTek VoIP models is pre-configured to give priority to VoIP calls to/from the FXS ports built into the router. We recommend you keep QoS enabled to assure your Voice quality. Simply tick the “Enable the QoS Control” box as shown below:

If you are using a broadband router model such as the Vigor2100, Vigor2910 or Vigor2930 model, you will also need to enter the bandwidth (speed) of your internet connection.