Yealink SIP-T48G Administrator's Manual page 432

Administrator's Guide for SIP-T2_Series_T4_Series IP Phones
Phone User Interface:
Menu->Settings->Advanced Settings (default password: admin)
->Network->VLAN->DHCP VLAN->Option
network.vlan.vlan_change.enable
Description:
Enables or disables the IP phone to obtain IP address with lower preference of
VLAN assignment method or disable VLAN feature when the IP phone cannot
obtain IP address with the current VLAN assignment method.
0-Disabled
1-Enabled
The priority of each method is: LLDP/CDP>Manual>DHCP VLAN.
If it is set to 1 (Enabled), when the phone cannot obtain IP address using the VLAN
ID obtained by LLDP/CDP during 2 minutes, the phone will use the manually
configured VLAN ID to obtain IP address; when the phone cannot obtain IP address
after using all the method, the phone will disable VLAN feature.
Web User Interface:
None
Phone User Interface:
None
To configure VLAN for Internet port via web user interface:
1. Click on Network->Advanced.
2. In the VLAN block, select the desired value from the pull-down list of WAN Port
Active.
3. Enter the VLAN ID in the VID (1-4094) field.
418
Parameters Permitted Values
0 or 1
Default
0