Yealink EXP40 - Manual (Page 42)

Yealink EXP40 User Guide
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If you leave this field blank, the LCD screen will display the default label “Zero
Touch”.
4. Click Confirm to accept the change.
You can configure a DSS key as the keypad lock key. Then you can press the keypad
lock key to immediately lock the keypad of your phone instead of long pressing the
pound key.
To configure a DSS key as the keypad lock key:
1. Click on DSSKey->Ext Key.
2. In the desired DSS key field, select Keyboard Lock from the pull-down list of Type.
3. Enter the desired value in the Label field or leave it blank.