I have setup QoS on my LAN, however when i sniff my RTP stream from two 7912 phones i notices that they do not mark the packets with COS tag. How do i achieve this? SCCP seems to be fine but rtp is just like any other packet CoS is 0.
I am spaning port that the phone is pluged into, below is config of phone port
interface FastEthernet0/7
switchport mode access
switchport voice vlan 2
mls qos trust cos
spanning-tree portfast
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