Yealink EXP40 - Manual (Page 27)

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 line key. It performs the same as a hard line key. You
can press this key to accept the incoming calls, place active calls on hold or resume a
held call.
To configure a DSS key as the line key:
1. Click on DSSKey->Ext Key.
2. In the desired DSS key field, select Line from the pull-down list of Type.