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3750 mls qos trust dscp for lync client

I am troubleshooting a QoS issue for lync traffic. 

I have been told that the lync client is having its traffic marked to EF by group policy but the markings are getting stripped somewhere. My starting point is on the access switch Catayst 3560 

The configuration on the port is

interface GigabitEthernet0/1

 switchport access vlan 10

 switchport voice vlan 20

 srr-queue bandwidth share 10 10 60 20

 srr-queue bandwidth shape 10 0 0 0

 queue-set 2

 mls qos trust cos

 auto qos voip trust

I am assuming that in order to trust the DSCP marking from the lync client I need to change mls qos trust cos to mls qos trust dscp

The issue is the port also has a phone in it. 

Can anyone provide any more advice on how to trust EF markings for lync (assume this works the same for jabber?) traffic on a port by port basis.

Thanks

Roger

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My question is what do you do

My question is what do you do when you have an IP phone for which you are trusing CoS and a Lync client for which you are trusting DSCP. 

You can't do both, so how can I handle QoS for a lync client as well as trusting CoS for the IP phone

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