Yealink SIP-T2 Series Administrator's Manual page 412

Administrator's Guide for SIP-T23 & T23P & T23G IP Phones
- (Optional.) If you mark the DHCP radio box, you can configure the static DNS
address in the corresponding fields.
4. Click Confirm to accept the change.
A dialog box pops up to prompt that the settings will take effect after a reboot.
5. Click OK to reboot the phone.
To configure IPv6 address assignment method via phone user interface:
1. Press Menu->Settings->Advanced Settings (default password: admin)
->Network->WAN Port.
2. Press
3. Press
4. Press
If you select the Static IPv6 Client, configure the IPv6 address and other network
parameters in the corresponding fields.
5. Press the Save soft key to accept the change
The IP phone reboots automatically to make settings effective after a period of
time.
To configure static DNS when DHCP is used via phone user interface:
1. Press Menu->Settings->Advanced Settings (default password: admin)
->Network->WAN Port->IPv6->DHCP IPv6 Client.
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or to select IPv4&IPv6 or IPv6 from the IP Mode field.
or to highlight IPv6 and press the Enter soft key.
or to select the desired IPv6 address assignment method.