AudioCodes MP-26 series, User Manual

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User's Manual 11. Quality of Service
Version 4.4.0 147 MP26x/MP27x
11.4 Configuring DSCP Mapping
To understand Differentiated Services Code Point (DSCP), one must first be familiarized
with the Differentiated Services (DiffServ) model. DiffServ is a Class of Service (CoS)
model that enhances best-
effort Internet services by differentiating traffic by users, service
requirements and other criteria. Packets are specifically marked, allowing network nodes to
provide different levels of service, as appropriate for voice calls, video playback or other
delay-sensitive applications, via priority queuing or bandwidth allocation, or by choosing
dedicated routes for specific traffic flows.
DiffServ
defines a field in IP packet headers referred to as DSCP. Hosts or routers passing
traffic to a DiffServ-enabled network typically mark each transmitted packet with an
appropriate DSCP. The DSCP markings are used by DiffServ network routers to
appropriately classify packets and to apply particular queue handling or scheduling
behavior.
The device
provides a table of predefined DSCP values, which are mapped to 802.1p
priority marking method. You can edit or delete any of the existing DSCP setting, as well as
add new entries.

To view and set DSCP rules:
1. From the menu bar, click the QoS menu link, and then click the DSCP Settings tab;
the following screen appears:
Figure 11-9: DSCP Settings Screen