Yealink SIP-T42G - Manual (Page 35)

Customizing Your Phone
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2. Enter the desired time 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 desired values in the Current PIN, New PIN and Confirm PIN fields
respectively.
3. Press the Save soft key to accept the setting or the Back soft key to cancel.
Note
The default timeout is 0 second, that is, you can long press to lock the keypad only.
I nterval of automatic keypad lock is configurable via web user interface only.
The unlock PIN length must be within 15 digits.