Yealink T40G

Yealink T4 Series IP Phones User Guide
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1. Long press the desired Ext key on the expansion module.
The phone screen will enter the user setting interface of this key.
2. Customize the specific feature for this key on the phone.
3. Select Save.
Adjusting the Contrast of the Expansion Module
You can configure the contrast of the expansion module via the host phone to make it easier to read.
Procedure
1. Navigate to Menu > Basic > Display > Contrast.
2. Select the desired value between 1 and 10 (highest intensity) from the Contrast field.
3. Select Save.
Adjusting the Backlight of the Expansion Module
When you change the backlight intensity settings on your T48S/T48G/T46S/T46G phones, the backlight on expansion
module connected to your phone automatically changes to match the new settings.
Related Topic
Changing the Backlight and Time