Help > Using the Phone > Basic Knowledge > Keys and LEDs
Keys and LEDs
2 Touch function keys on the display 
The configured touch function keys are displayed in the right area of the home screen of the display. The status of the stored function is signalled by a coloured marking.
The operation is carried out by
•Tapping the key
•Selection via directional pad and OK
The configuration takes place, among other things: through: Add entry to list
*Further help under Function keys
*Note: If more touch function keys are configured than can be displayed at the same time, navigation through the list is as follows:
•Directional pad key
•Gesture control
*Note: If a function key programmed as a speed dialling number is to be used for queries during a conversation, the home screen of the display can be called up for this purpose. When dialling begins, the programmed speed dials are also offered as suggestions in a list.
•Enter idle state:
•If necessary, back:
2 housing LED 
The housing LED indicates the following statuses:
•Flashing red (quickly): incoming call
•Lit in red: active call
3 Fixed function keys 
Messages with LED
•Displays these lists:
−Voice messages
−Missed calls
•Pressing the message key displays the messages. Depending on the device variant, you can press the message key again to clear the display if you do not want to respond to the message.
*Note: The behaviour of the LED message key can be configured viaSettings > Display and LED > Seen missed calls / Heard voice messages
Microphone with LED
•Switches the microphone off (mute) or on again.
•LED is shining red: microphone is disabled
Hold with LED
•You can put an active call on hold or reconnect it again.
Redialling
•Displays the outgoing calls list.
Headset with LED
•Press the Headset key to enable or disable the headset.
•LED is shining green: headset operation is active
•LED is flashing green: incoming call
•LED is shining red: active hedaset call
Transfer without LED
•You can transfer calls with or without prior notification.
minus
•Reduces the volume of the ringer, receiver, or loudspeaker, depending on operational state
Loudspeaker with LED
•LED is flashing green: incoming call
•LED flashing red: loudspeaker listening is enabled
•LED is shining red: hands-free calling is enabled
plus
•Increases the volume of the ringer, receiver, or loudspeaker, depending on operational state.
4 Directional pad and OK 
Use the directional pad to navigate in the display.
Use the directional pad direction keys to start operation and activate required elements in lists and menus. By pressing OKthe activated element is selected and the element's function is executed.
5 Delete, Home and Back 
Delete
•Press this to delete the last character before the cursor.
Home
•Press this to display the home screen. Previously started actions will continue in the background.
Back
•Press this to return to the most recently opened menu and end the current action.
6 Proximity sensor, Brightness sensor 
*Further help under Display and LED
*Further help under Sound
7 Keypad 
Use the keypad to dial subscriber numbers and to enter numbers and letters. Press the digit keys one or more times until the required character appears. The assignment is then listed in the table below. The characters available vary according to the language configured for the device.
Key
Assignment
1
1 - / @
2
a b c 2 A B C ä Ä
3
d e f 3 D E F
4
g h i 4 G H I
5
j k l 5 J K L
6
m n o 6 M N O ö Ö
7
p q r s 7 P Q R S ß
8
t u v 8 T U V ü Ü
9
w x y z 9 W X Y Z
0
Space . , 0 + : ‘ \ “ ? ¿ ! ¡ _
*
* ( ) [ ] < = > « » ^ ´ ` ~ { }
#
# % & § £ $ €
COMfortel D-XT20/D-XT20i key extension module 
The number of programmable function keys on the device can be extended by adding up to three COMfortel D-XT20/D-XT20i key extension modules (not included in the scope of delivery). The module has 20 function keys (A). Each function key has a multicoloured LED that signals the status of the function stored on the first level. Next to the key, the associated key label and status are shown in the display.
*Note: The horizontal scroll bar at the top and bottom of the display shows the active key level (1-3). The key labelling in the display changes with the key level. The key level can be changed by pressing the control rocker (B).
*Further help under Function keys