LevelOne VOI-7011 - Manual (Page 48)

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LAN Settings
This embedded NAT is useful for ADSL users without NAT
router, and it separates the WAN port from the LAN port to
perform router IP address translation. Connect your PC to the
LAN port, set your PC as DHCP Client mode, and then the PC
will get an IP address from the IP Phone automatically.
Note
You must set LAN Mode as NAT under WAN
Settings, otherwise the DHCP Server will not work