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| Also, where is the QOS parameter set in the switch? |
There are a lot of settings/commands on this kind of switch to filter, re-mark and queue traffic using QoS, but usually the phone will mark the traffic itself using industry-standard values for DSCP and 802.1p and the switch will honour them.
You only need to configure the switch if it doesn't recognize the values used by the phone or if you want to enhance security by filtering and re-marking all traffic when it enters the network.