Yealink SIP-T48G Administrator's Manual page 190

Microsoft Lync Edition Administrator's Guide for SIP-T2_Series and T4_Series IP Phones
2. In the ICMPv6 Status block, select the desired value from the pull-down list of
Active.
3. Click Confirm to accept the change.
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->DNS Server.
2. Press
3. Enter the desired values in the Pri DNS and Sec DNS fields respectively.
4. Press the Save soft key to accept the change.
The IP phone reboots automatically to make settings effective after a period of time.
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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.
or , or the Switch soft key to select Enable from the Static DNS field.