You say : older Cisco switches, by default, if QoS enabled, didn't trust ingress traffic..So you mean that the DSCP tags could be already removed by the switch that is ahead of the router?In fact, the voice traffic passes through a L3 switch before r...

Hi Shashank, this information about trusted boundaries is very valuable for me. I am not an admin for CISCO networks but a supplier for a custom made telephony system. A first trial in the field has failed due to heavy congestion on a 2Mbit/s E1 link...