The functions
Setting the handset
Handset volume
Menu Set telephone
Menu Handset volume
Confirm.
Enter the handset volume (from 1 to 4), e.g. 3.
Confirm.
Temporarily adjusting the handset volume during conversation
You are speaking on the telephone.
Press the volume buttons on the side of the handset housing.
The set volume remains effective for the current conversation. The preset
handset volume will subsequently be reactivated.
Permanently setting the handset volume during conversation
You are speaking on the telephone.
Press the volume buttons on the side of the handset housing.
Press the right softkey.
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Integral 33/55