Yealink T48S Skype For Business Edition User Manual page 57

Select Static IP from the pull-down list of Type.
4.
Enter the desired value in the IP address, IPv6 IP Prefix, Gateway, Pri.DNS and Sec.DNS
5.
field respectively.
Tap to accept the change.
6.
Network is configurable via web user interface at the path Network->Basic.
Getting Started
55