Configure Layer 3 Switches to Trust the DSCP Values From Interaction Media Server

Some layer 3 switches remove the DSCP value in marked outbound IP packets and replace it with a 0 (zero). When you configure QoS tagging on your Interaction Media Server, ensure that you configure the layer 3 switches in your network to trust the DSCP value that Interaction Media Server adds. For example, for a Cisco switch, you would type the following command for each interface that handles RTP traffic from an Interaction Media Server:

mls qos trust dscp

Failure to configure layer 3 switches in your network to trust the DSCP values in IP packets from Interaction Media Server can result in audio quality issues.