Yealink SIP-T21, User Manual

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Customizing Your Phone
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2. Enter the desired interval in the Phone Lock Time Out (0~3600s) field.
3. Click Confirm to accept the change.
Note
To unlock the keypad, you must know the keypad unlock PIN of the phone. The default
keypad unlock PIN is “123”.
To change the keypad unlock PIN via phone user interface:
1. Press Menu->Settings->Basic Settings->Phone Unlock PIN.
2. Enter the current PIN in the Current PIN field.
3. Enter the new PIN in the New PIN field.
4. Enter the new PIN again in the Confirm PIN field.
5. Press the Save soft key to accept the change or the Back soft key to cancel.
Note
The default interval is 0 second, that is, you need to long press to lock the keypad.
The interval of automatic keypad lock is configurable via web user interface only.
The unlock PIN length must be within 15 digits.