Yealink SIP-T28P - Manual (Page 75)

Customizing Your Phone
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2. Customize specific features for these keys.
3. Click Confirm to accept the change.
You can click Reset to default to reset custom settings to defaults.
Note
You can register one or multiple accounts on the SIP-T28P IP phone. You can also
configure each line key to associate with an account or configure multiple line keys to
associate with an account.
To register 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 Enable from the Activation field.
Programmable keys are configurable via web user interface only.