Yealink SIP-T20 - Manual (Page 34)

User Guide for the SIP-T20P/SIP-T20 IP Phone
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3. Press or to select desired type from the Keypad Lock field.
4. Press to accept the change.
5. 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.
3. Click Confirm to accept the change.
Note
1. Keypad Lock:
◄ Menu Key ►
Keypad
Locked!
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.