Configuring Differentiated Services for VoIP
D-Link Unified Wired and Wireless Access System
Oct. 2015 Page 694
D-Link UWS User Manual
Configuring Differentiated Services for VoIP
One of the most valuable uses of DiffServ is to support Voice over IP (VoIP). VoIP traffic is inherently time-
sensitive: for a network to provide acceptable service, a guaranteed transmission rate is vital. This example
shows one way to provide the necessary quality of service: how to set up a class for UDP traffic, have that
traffic marked on the inbound side, and then expedite the traffic on the outbound side. The configuration
script is for Router 1 in the accompanying diagram: a similar script should be applied to Router 2.
Figure 436: DiffServ VoIP Example Network Diagram
1. To set queue 5 on all ports to use strict priority mode, go to the LAN > QoS > Class of Service > CoS Interface
Queue Configuration page and configure the following settings:
• Slot/Port: Global
• Queue ID: 5
• Scheduler Type: Strict
2. Click Submit.
Queue 5 will be used for all VoIP packets.
123
456
789
*
8#
Port 0/2
Port 0/3
Layer 3 Switch
operating as
Router 1
Layer 3 Switch
operating as
Router 2
Internet
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