Yealink EXP20 User Guide
viii
Using the Line Key .............................................................................................................. 41
Adjusting the Contrast ....................................................................................................... 42
Adjusting the Backlight ...................................................................................................... 43
Using the Busy Lamp Field ................................................................................................ 44
Resetting the Yealink EXP20 LCD Expansion Module .................................................... 44
Troubleshooting ...................................................................... 47