Dell POWEREDGE M1000E - Manual (Page 605)

Configuring VLANs 605
Voice VLAN
Use the Voice VLAN Configuration page to configure and view voice VLAN
settings that apply to the entire system and to specific interfaces.
To display the page, click Switching → VLAN → Voice VLAN →
Configuration in the navigation panel.
Figure 21-24. Voice VLAN Configuration
NOTE: IEEE 802.1X must be enabled on the switch before you disable voice
VLAN authentication. Voice VLAN authentication can be disabled in order to
allow VoIP phones that do not support authentication to send and receive
unauthenticated traffic on the Voice VLAN.