User Guide

Yealink EXP20 User Guide
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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.
Busy Lamp Field (BLF)
Busy Lamp Field (BLF) allows you to monitor the status changes of a user. You can configure an
Ext key as the BLF key, which allows you to monitor the status (idle, ringing or busy) of the
pre-defined phone user. You can also pick up the incoming call of the monitored user directly by
pressing the BLF key. For more information on using the BLF feature, refer to Using the Busy
Lamp Field on page 47.
To configure an Ext key as the BLF key:
1. Click on Dsskey->Ext Key.
2. In the desired Ext key field, select BLF from the pull-down list of Type.
3. Enter the phone number you want to monitor 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 of the EXP20 LCD expansion module will
display the value specified in the Value field (e.g., 1011).
5. Select the desired line to apply this key from the pull-down list of Line.