Yealink SIP-T48G Administrator's Manual page 38

Microsoft Lync Edition Administrator's Guide for SIP-T2_Series and T4_Series IP Phones
network.secondary_dns
Description:
Configures the secondary IPv4 DNS server.
Example:
network.secondary_dns = 202.101.103.54
Note: It works only if the value of the parameter "network.static_dns_enable" is set
to 1 (On). 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->Secondary DNS
Phone User Interface:
Menu->Settings->Advanced Settings (default password: admin) ->Network->WAN
Port->DNS Server->Sec DNS
To configure static DNS address when DHCP is used via web user interface:
1. Click on Network->Basic.
2. In the IPv4 Config block, mark the DHCP radio box.
3. In the Static DNS block, mark the On radio box.
4. Enter the desired values in the Primary DNS and Secondary DNS fields.
5. Click Confirm to accept the change.
A dialog box pops up to prompt that settings will take effect after a reboot.
6. Click OK to reboot the phone.
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Parameters Permitted Values
IPv4 Address
Default
Blank