Yealink SIP-T21 - Manual (Page 64)

User Guide for the SIP-T21P/SIP-T21 IP Phone
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You can click Reset to default to reset custom settings to defaults.
Note
You can register one or multiple accounts on the SIP-T21P/SIP-T21 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.
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.
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 to disable the account.
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.
You can configure multiple line keys to associate with an account. This enhances call
visualization and simplifies call handling.
Programmable keys are configurable via web user interface only.