Yealink SIP-T22 - Manual (Page 35)

Customizing Your Phone
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To activate the keypad lock via phone user interface:
1. Press Menu->Settings->Advanced Settings (password: admin) ->Phone
Settings->Keypad Lock.
2. Press or , or the Switch soft key to select the desired type from the Keypad
Lock field.
3. Press the Save soft key to accept the change.
4. Long press to lock the keypad immediately when the phone is idle.
The LCD screen prompts “Keypad Locked!” and displays the icon .
You can specify the interval (in seconds) to automatically lock the keypad instead of
long pressing .
To configure the interval of automatic keypad lock via web user interface:
1. Click on Features->Phone Lock.
2. Enter the desired interval in the Phone Lock Time Out (0~3600s) field.