Cisco Cisco Administrative Workstation Installation Guide

All current TCP connections are terminated when the Packet Scheduler is 
installed. Therefore, even though a reboot of the machine is not required when the 
Packet Scheduler is installed, current TCP connections are terminated. You 
should not install the Packet Scheduler if important connections are in progress.

Open Network and Dial-up Connections.

Right click the Network Connection (Public Visible) on which you want to install 
the QoS Packet Scheduler. Select Properties.

Click the Install button. The Select Network Component Type dialog box 
appears.

Select Service and click the Add button. The Select Network Service dialog box 
appears.

Select QoS Packet Scheduler. Click OK to begin the installation process.

ICM DSCP markings are set in compliance with Cisco AVVID recommendations 
(but can be overwritten if necessary). See Cisco AVVID Solution IP Telephony 
QoS Classification for details about Cisco AVVID packet classifications.

Before QoS implementation, IP-based prioritization is used to provide two 
externally visible priority levels (High and non-High) for the communication 
between the PG and the CC. In fact, however, there are three different priorities 
for application messages: High, Medium, and Low. High and medium priority 
messages are sent through the same High priority IP connection, and low priority 
messages are sent through the non-High priority IP connection.

With QoS implementation, DSCP is the means of marking and maintaining an IP 
packet’s relative priority as it traverses the network. The DSCP value for each 
priority must be defined appropriately so that its latency requirement is met. 

 lists application messages under each priority and the corresponding 

latency requirement.