Yealink SIP-T48G - Manual (Page 29)

Getting Started
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3. Enter the user name (admin) and password (admin) in the login page.
4. Click Confirm to login.
The phone status is displayed on the first page of the web user interface.
If your phone cannot contact a DHCP server for any reason, you need to configure
network settings manually. The IP phone can support either or both IPv4 and IPv6
addresses.
To configure the IP address mode via phone user interface:
1. Tap ->Advanced (password: admin) ->Network->WAN Port.
2. Tap the gray box of the IP Mode field.