Does native vlan tagging work with voice vlan?

Question

we hard-code native vlan tagging:

vlan dot1q tag native

then we configure a port like this:

interface FastEthernet0/1
switchport access vlan 20
switchport mode access
switchport voice vlan 500
mls qos trust cos
spanning-tree portfast

Does this cause problem? I mean second configuration assumes that there are two vlans:

1. native vlan which is untagged (but here it is tagged)
2. voice vlan

Answer 1

I asked this question in networking-forum and they told:

No, the IOS doesn't consider the voice/access port a trunk port.