The Avaya J100 Series IP Phones have an internal network switch that is capable of using VLANs to segregate traffic between the LAN port, the PC port and the internal port that goes to the CPU of the phone. You can have VLAN functionality on this switch and configure the switch to isolate the traffic destined for the CPU of the phone from that destined to the PC port.

The configuration of the internal switch of the phone can be done through the 46xxsettings.txt file, LLDP or DHCP. It is preferable to configure the VLAN settings on the internal switch of the phone through DHCP or LLDP as these protocols are run prior to and during network initialization. If that is not possible then the 46xxsettings.txt file configuration parameters can be used and the VLAN can be started in automatic mode which is the default mode.