Yealink SIP-T28P - Manual (Page 76)

User Guide for the SIP-T28P IP Phone
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4. Enter the desired values in the Label, Display Name, Register Name, User Name,
Password and SIP Server1/2 fields respectively. Contact your system administrator
for more information.
5. Press the Save soft key to accept the change or the Back soft key to cancel.
You can repeat steps 2 to 5 to register more accounts.
The following figures show single or multiple accounts registered on the phone:
Single account:
Multiple accounts:
To disable an account via phone user interface:
1. Press Menu->Settings->Advanced Settings (password: admin) ->Accounts.
2. Select the desired account and then press the Enter soft key.
3. Select Disable from the Activation field.
4. Press the Save soft key to accept the change or the Back soft key to cancel.
Account registration is configurable via web user interface at the path
Account->Register.