User Guide

Configuring the Yealink EXP40 Expansion Module
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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.
DTMF
You can configure an Ext key as the DTMF key. If you press the DTMF key during an active call,
the phone will send the pre-defined DTMF digits.
To configure an Ext key as the DTMF key:
1. Click on Dsskey->Ext Key.
2. In the desired Ext key field, select DTMF from the pull-down list of Type.
3. Enter the desired DTMF digits in the Value field (e.g., 123A).
4. Enter the desired value in the Label field or leave it blank.