In this case, I guess it doesn't make too much difference as long as you have configured a voice-vlan. The Cisco IP phone always checks (cisco-only) if a voice-vlan is active and will then start to communicate over this voice-vlan. When the voice-vlan is not the native vlan, this will require dot1p/q tagging which also comes in handy for QoS;-)
What I am missing in your config is something like:
description CISCO PHONE
mls qos trust device cisco-phone
This line will instruct the switch to "trust" the QoS classifucation from the phone.
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