DS4501-002
21
VLAN SETTINGS
There are two parts for VLAN settings. One is to set for VoIP packets related to VoIPhone, and the other is for the VLAN setting in the NAT
Mode.
There are two kinds of destination packets coming to the WAN port, one is VoIP packets for VoIPhone, and the other will go through the WAN
port to the LAN port.
VLAN Packets: If you enable VLAN Packets and set the VID, User Priority, and CFI, then all the incoming packets will be checked with the IP
Address and the VID.
VID: Please set your VID in accordance with your service provider.
User Priority: Defi nes user priority with eight (2^3) priority levels. IEEE 802.1P defi nes the operation for these 3 user priority bits. Usually, this will
be defi ned by your service provider.
CFI: Canonical Format Indicator is always set to zero for Ethernet switches. CFI is used for compatibility between Ethernet type network and Token
Ring type network. If a frame received at an Ethernet port has a CFI set to 1, then that frame should not be forwarded as it is to an untagged port.
When you enable the VLAN Packets and set the VID, User Priority, and CFI, then all the incoming packets with VoIPhone IP address and the
same VID will be accepted by VoIPhone. If the incoming packets with VoIPhone IP address but different VID then the packets will be discarded
by VoIPhone. The Other incoming packets with different IP address will go through the WAN port to the LAN port.
NAT VLAN Setting: When set in embedded NAT mode, the VoIPhone will fi lter out the wrong incoming packets. You can separate the other
devices connected behind the embedded NAT into 4 VLAN groups by assigning different VID for these 4 groups. VoIPhone will check the VID of
the incoming packets from ADSL modem. If the packet is not with VoIPhone IP address and the right VID, or the VID is not of these 4 VIDs you
set, then the packets will be discarded by VoIPhone.
