The question calls for Layer-2 trust to be applied to a wired IP Phone port.
The solution applies the command:

interface FastEthernet2/20
 mls qos trust cos

It would help in this question if it mentioned the model of the module that
the phone is connected to. If its connected to a 6248/6348 it would not. To
get it to work with a 6248/6348 you would need to configure a policy-map due
to a hardware limitation

policy-map trust-cos
 class class-default
  trust cos
!
interface FastEthernet2/20
 mls qos trust cos
 service-policy input trust-cos

Reference 
here<http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008014a29f.shtml#limit_linecards>

Comments welcome.

Regards,
Leigh.

-- 
CCIE Blog - http://leigh-cciewireless.blogspot.com/
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