Using the telephone : Getting to know your telephone : Control key
Control key
The control key enables you to navigate the menus and input fields, and also to call up certain functions depending on the situation.
In the description below, the side of the control key (up, down, right, left) that you have to press in the different operating situations is marked in black, e.  g. for "press right on the control key" or for "press the centre of the control key".
 
In idle status
Open the directory
 Press briefly
Open the list of available online directories
 Press and hold
Open the main menu
or
Open the list of available online directories
(if available and configured)
In submenus, selection and entry fields
Confirm a function
During a conversation
Open the directory
Open the list of available online directories
 Press and hold
Mute the microphone
Open company directory (if available and configured)
or: Initiate an internal consultation call
Adjust the loudspeaker volume for receiver and handsfree mode