A quick question: after issuing "auto qos voip cisco-phone" in an interface fa0/5 which is connected to a cisco phone, the DSCP value on Skinny packet from phone has been changed to the default value 0. when I stop the MLS QOS on switch, DSCP value on Skinny parcket back to default value CS3, same happened to the port connect to CUCM.
I know that by default the Cisco swith will not remark any packet, when packet go thought the it. Once QOS enabled, switch will remove all the existing mark on incoming parket and remark it with DSCP 0, theoretically on the port with "auto qos voip trust" command, it should trust the marking made by phone or cucm. but in my test with Wireshark, the value has been set to default. try on switch 3550 and 2960 same result, have I missed something here?