Yealink EXP40 - Manual (Page 35)

Configuration
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If you leave this field blank, the LCD screen will display the default label “Hot
Desking”.
4. Click Confirm to accept the change.
You can configure a DSS key as the prefix key. If you press the prefix key when the
phone is idle, the phone enters into the dialing interface and displays the prefix number
which you specified. You can enter other digits and then dial out.
To configure a DSS key as the prefix key:
1. Click on DSSKey->Ext Key.
2. In the desired DSS key field, select Prefix from the pull-down list of Type.
3. Enter the prefix number you want to add before the entered number in the Value
field.
4. Enter the desired value in the Label field or leave it blank.