Yealink SIP-T38G - Manual (Page 67)

Customizing Your Phone
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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->Setting->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.
You can also register or disable an account via web user interface at the path
Account->Basic.
You can configure multiple line keys associated with an account. This enhances call
visualization and simplifies call handling.