D-Link 2Voice + 4SW VoIP Router DVG-1402S Manual page 16

Secondary DNS
Address
Upstream
Bandwidth
provided by your ISP
This is an optional DNS Address entry to be used if the primary
DNS fails.
The upstream bandwidth can be set to suit the type of packets
that the connection will be sending. The bandwidth can be
maximized for voice packets and limited for data that requires
less throughput.
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