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Dell powerconnect 6248 voice vlan next to dot1x

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We are testing currently dot1x auth against FreeRADIUS/AD in the network. The vlans are dynamically assigned by FreeRADIUS on AD-group base. This works, but now the problem comes:

We wanted to add our ip-telephones which doesn't speak dot1x to the network so we created a voice-vlan on the interfaces. This still didn't solve our problems because our ip-telephone came in the guest-vlan.

the interface configuration is the following:

...  ! interface ethernet 1/g7  spanning-tree portfast  switchport mode general  switchport general allowed vlan add 22 tagged  dot1x guest-vlan 55  voice vlan 22  voice vlan auth disable ... 

dot1x mac-auth-bypass also doesn't work because we have a guest vlan configured.

So my question is the following: How do I configure it on a Dell powerconnect 6248p so that my ip telephones will be on the correct vlan and still have my dot1x auth for users and still having a working guest vlan?

Answers

The first thing I'd verify is that the phone is actually tagging frames with that VLAN ID, perhaps with a network tap or port mirror (which might not quite work right on this switch)

If you manually had configured the phone to do that and you know it's working, this is probably a bug in the software.

If not, manually set it on the phone or configure LLDP-MED (Link Level Discovery Protocol) on the interface to do this automatically. Depending on the type of phone (this includes most Polycom, Avaya, and Cisco), it should listen for LLDP packets and learn what the voice VLAN tag is and start sending on that tag.

my-dell-switch(config-if-1/g1)#lldp med

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