Avaya T3 (IP) Comfort - Manual (Page 89)

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Customizing the telephone
Setting audio, contrast and language
Setting the language
Press the "Menu" function key.
Scroll to the Settings menu item.
Confirm your selection.
Scroll to the Display / Acoustics menu item.
Confirm your selection.
Scroll to the Language menu item.
Confirm your selection. The currently set language is highlighted.
Select the desired language.
Exit menu. Your telephone will reset itself.
All display texts will now be in the selected language.