Tenovis MM780 Operating Instructions Manual page 56

The functions
Call charge display
Call charge display during an ongoing conversation
You may configure your handset to display the call charges when you are
speaking on the telephone.
Displaying the total call charges for the current call
Confirm the setting.
Displaying the total call charges for all calls
Confirm the setting.
Displaying no call charges
Confirm the setting.
Displaying the call charges as units
Confirm the setting.
Displaying the call charges as an amount
Confirm the setting.
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Press the programming button. Enter the code 822.
Press the programming button. Enter the code 823.
Press the programming button. Enter the code 824.
Press the programming button. Enter the code 820.
Press the programming button. Enter the code 821.
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