AASTRA DT590 for MD Evolution User Guide EN - Manual (Page 121)

251 MD Evolution – Cordless DT590
More Features on your Extension
Calculator
The DT590 has a calculator that supports general arithmetic
functions such as addition, subtraction, multiplication, and division.
Route: Menu » Toolbox » Calculator ¾
Press.
º
Select the “Toolbox” tab.
º Ь Ы
Select the menu item “Calculator” and confirm.
¿
Enter digits. #
Enter for addition.
Or: ##
Enter for subtraction.
Or: ###
Enter for multiplication.
Or: ####
Enter for division.
¿
Enter digits.
Ь Ы
Press to get the results.