D-Link DVG-5121SP User Manual page 62

VoIP Setting
TOS
QoS (Quality of Service): Sets an external bandwidth to ensure sound quality during transmission (When
this function is enabled, the voice packet has the highest priority to ensure telecommunication quality
while less bandwidth is assigned for data transmission). Some models of the VoIP telephone adapter
without this function can adjust the bandwidth automatically.
SIP TOS- default Minimize-Delay
RTP TOS- default Minimize-Delay
QOS Priority Setting- default disable
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DVG-5121SP User's Manual
D-Link Corporation