We want to assign flows from Softphones to the "best effort" category in our QoS Model, but we would like to avoid working at LAN Switch level with the "trust" commands.
Then the question is: ¿is there any way to ask CUCM´s administrator to assign Softphones to a group in which the DSCP field of RTP packets are set to 0?
Any hints/ideas will be greatly appreciated.
Best regards, Rogelio
I'm not aware of a way to do this - you can adjust the Enterprise Parameters to change what CUMC tells the end points to mark on the packets, but only at a system-wide level.
If you really want to 0 the DSCP out, then you could consider:
1) Using the trust-cisco-phone style switch configs with extend cos 0 to prevent PCs marking
2) On your WAN router remark any voice traffic from the data VLAN to 0, whilst leaving voice traffic from the voice VLAN at EF.
Perhaps if you can tell us why you want to do this we could make more suggestions - doing this at the switch level isn't that complicated.
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