Dell PowerConnect 7048P Manual page 628

console(config-if-Gi1/0/10)#voice vlan 25
6 Disable authentication for the voice VLAN on the port. This step is
required only if the voice phone does not support port-based
authentication.
console(config-if-Gi1/0/10)#voice vlan auth
disable
7 Exit to Privileged Exec mode.
console(config-if-Gi1/0/10)#<CTRL+Z>
8 View the voice VLAN settings for port 10.
console#show voice vlan interface gi1/0/10
Interface............................. Gi1/0/10
Voice VLAN Interface Mode............. Enabled
Voice VLAN ID......................... 25
Voice VLAN COS Override............... False
Voice VLAN DSCP Value................. 46
Voice VLAN Port Status................ Disabled
Voice VLAN Authentication............. Disabled
628
Configuring VLANs