User Guide

Using the Yealink EXP40 expansion module

5. Press the Save soft key to accept the change or the Back soft key to cancel on the host

phone.

For more information on adjusting the backlight on the phone, refer to the Backlight section of

Yealink phone-specific user guide, available online:

http://support.yealink.com/documentFront/forwardToDocumentFrontDisplayPage.

Using the Busy Lamp Field

The busy lamp field (BLF) feature allows you to monitor the status change of users through BLF

LED indicators. For example, you can configure a BLF key on the connected EXP40 expansion

module to monitor the status of a friend’s line (busy or idle). For more information on

configuring an Ext key as the BLF key, refer to Busy Lamp Field (BLF) on page 11.

The BLF key LED illuminates solid red when the monitored line is in use. The BLF key LED

illuminates solid green when the monitored line is idle. For more information on BLF key LED

indications, refer to LED Instructions on page 4.

You can press a BLF key to dial out the monitored phone number when the monitored line is

idle and pick up calls that are received on the monitored line. When there is an active call on the

host phone, you can transfer the active call to the monitored phone number directly by pressing

the BLF key.

For more information on using BLF feature on the phone, refer to the Busy Lamp Field (BLF)

section of Yealink phone-specific user guide, available online:

http://support.yealink.com/documentFront/forwardToDocumentFrontDisplayPage.

Resetting the Yealink EXP40 Expansion Module

You can reset the EXP40 expansion module to clear all configurations by resetting the host

phone. The reset process of the EXP40 expansion module is synchronized with the host phone.

To reset the EXP40 expansion module connected to the host phone (Taking the SIP-T46S

IP phone as an example for reference):

1. Press Menu->Advanced (password: admin) ->Reset Config->Reset to factory on the

host phone.

2. Press the Reset soft key on the host phone.