Yealink SIP-T4X Administration Manual page 205

Administrator's Guide for SIP-T4X IP Phones
4. Click Confirm to accept the change.
A dialog box pops up to prompt that the settings will take effect after reboot.
5. Click OK to reboot the IP phone.
To configure SLAAC feature via web user interface (not applicable to SIP-T42G/T41P):
1. Click on Network->Advanced.
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 via phone user interface:
1. Press Menu->Advanced (password: admin) ->Network->WAN Port.
2. Press
field.
3. Press
4. Press
If you select the Static IP, configure the IPv6 address and other configuration
parameters in the corresponding fields.
5. Press the Save soft key to accept the change
The IP phone reboots automatically to make the settings effective after a period of
time.
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or to select the desired address mode from the IP Address Mode
or to highlight IPv6 and press the Enter soft key.
or to select the desired IPv6 address assignment method.