Reference10:Interfaces/ETH/VLAN

If a network uses several VLANs (Virtual Local Area Network), a VLAN can be specified for every Ethernet interface. This ensures that the data packets are transmitted to the specified VLAN only. Usually the VLAN configuration (both VLAN ID and Priority) for innovaphone devices will be provided either by a DHCP Server or a network switch via LLDP/MED. In both cases the values configured here are ignored.

ID	The ID of the VLAN. The value 0 is applied if the ID entry field is empty. The VLAN ID with the value 0 switches the QoS (Quality of Service) off according to 802.1q.
Priority	If the switch at the port to the innovaphone gateway happens to be configured to a different ID, the same value must be entered here to allow the Ethernet packets to be prioritised. A priority value between 0 and 7 is entered here (configuration on the Ethernet switch).

Since v10 by factory default the innovaphone devices accept VLAN configuration via LLDP/MED provided by the switch. To disable this feature:

http://x.x.x./!config change LLDP0 /disable
http://x.x.x./!config write
http://x.x.x./!ireset

or for ETH1

http://x.x.x./!config change LLDP1 /disable
http://x.x.x./!config write
http://x.x.x./!ireset