You can select some function while the telephone is idle, for example:
Use to scroll to a function and press to execute it.
You can select other functions directly depending on the situation. Example: You call a number, but the line is busy:
Press to confirm.
or
Use to scroll to a function and press to execute it.
... Via the Program/Service Menu
First press the "Program/Service" key. You then see a list of selection options, such as: "#0=Reset services" .
Press the key.
Use to scroll to a function and press to execute it.
or
Enter the code directly. The Quick-Reference Operating Instructions contain a list of codes. However, they are also displayed on screen along with the corresponding function.
... With Function Keys
If you saved a function on a key , you can access it directly as follows :
Press the Mute key to execute the function
... Via the Large Graphics Display
In addition to situation-dependent functions, optiPoint 600 office also lets you use and access local applications, such as the personal telephone directory, via the large graphics-enabled display with its touchscreen functionality. See Display menu .
to scroll to a function and press 
to execute it. 
