Yealink SIP-T2 SERIES Administrator's Manual page 106

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Configures the IP address mode.
0-IPv4
1-IPv6
2-IPv4 & IPv6
Note: If you change this parameter, the IP phone will reboot to make the change take effect.
Web User Interface:
Network->Basic->Internet Port-> Mode(IPv4/IPv6)
Phone User Interface:
Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN
Port->IP Mode
network.internet_port.ip
Description:
Configures the IPv4 address.
Example:
network.internet_port.ip = 192.168.1.20
Note: It works only if the value of the parameter "network.ip_address_mode" is set to 0
(IPv4) or 2 (IPv4 & IPv6), and "network.internet_port.type" is set to 2 (Static IP Address). If
you change this parameter, the IP phone will reboot to make the change take effect.
Web User Interface:
Network->Basic->IPv4 Config->Static IP Address->IP Address
Phone User Interface:
Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN
Port->IPv4->Static IPv4 Client->IPv4
network.internet_port.mask
Description:
Configures the IPv4 subnet mask.
Example:
network.internet_port.mask = 255.255.255.0
Note: It works only if the value of the parameter "network.ip_address_mode" is set to 0
(IPv4) or 2 (IPv4 & IPv6), and "network.internet_port.type" is set to 2 (Static IP Address). If
you change this parameter, the IP phone will reboot to make the change take effect.
Web User Interface:
Network->Basic->IPv4 Config->Static IP Address->Subnet Mask
Phone User Interface:
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Parameters Permitted Values Default
IPv4 Address Blank
Subnet Mask Blank