You must determine a direct call number to perform a direct call. The room monitor number is used as the direct call number. This number is then selected once you activate the direct call key (). The room monitor function must be deactivated for this. 

Enter the direct call number via the room monitor function (). 

You can store a direct call number in the redial list by saving the number separately as "direct call" in your mobile telephone's telephone directory. 

Store the direct call number as "direct call" in your mobile telephone's telephone directory ().