Yealink SIP-T4X Administration Manual page 204

3. In the IPv6 Config block, mark the DHCP or the Static IP Address radio box.
- If you mark the Static IP Address radio box, configure the IPv6 address and
other configuration parameters in the corresponding fields.
- (Optional.) If you mark the DHCP radio box, you can configure the static DNS
address in the corresponding fields.
Configuring Advanced Features
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