Yealink EXP40 - Manual (Page 25)

Configuration
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5. Select the desired line to apply this key from the pull-down list of Line.
6. Click Confirm to accept the change.
You can configure a DSS key as the speed dial key. Then you can quickly dial out the
pre-defined number using the specified line by pressing the speed dial key.
To configure a DSS key as the speed dial key:
1. Click on DSSKey->Ext Key.
2. In the desired DSS key field, select Speed Dial from the pull-down list of Type.
3. Enter the desired number you want to dial out directly in the Value field.
4. Enter the desired value in the Label field or leave it blank.
If you leave this field blank, the LCD screen will display the number specified in the
Value field.