Configuring Access Layer QoS for Voice on Cisco Catalyst 6500 with Cisco IOS SW

mls qos
! -- turns QOS on for the whole switch
mls qos map cos-dscp 0 8 16 24 32 46 48 54
! -- maps COS to DSCP using the new standards of CS3 for signaling.
interface fastethernet 5/1
! -- the interface of course
switchport mode access
! -- disable trunking
switchport voice vlan 111
! -- enable trunking when CDP detects a phone. This is called DTP or Dynamic Trunking Protocol.
switchport access