Keys and LEDs
1 housing LED 
The housing LED indicates the following statuses:
Flashing red (quickly): incoming call
Lit in red: active call
2 Function keys near the display 
The function keys next to the display have two different functions:
In idle state: Freely programmable function keys
*Further help under Function keys
Each of the six function keys can be programmed with functions. Each function key has a multi-coloured LED that signals the status of the function stored on the first level when in idle state. The associated key label is shown in the display next to the key.
*Note: The horizontal scroll bar below the status bar 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 following keys:
directional pad Left and Right keys
Softkey Level right below the display
*Note: If a function key programmed as a speed dialling number is to be used for queries during a conversation, the idle state 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:
Back if necessary:
In menus and lists: Navigation
The top and bottom right keys quickly scroll through lists and menus.
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.
Elements on the display are shown in different ways to indicate their state:
aunderlined:The selected element is locked and cannot be selected by pressing OK.
bnegative:An element is displayed as a negative image in a dark bar if you activate it using the direction keys and you can display a sub-menu by pressing OK
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 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 + : ‘ \ “ ? ¿ ! ¡ _
*
* ( ) [ ] < = > « » ^ ´ ` ~ { }
#
# % & § £ $ €
7 Soft keys 
The four situation-dependent function keys below the display have different functions depending on the operating status or menu selection. Each function is displayed directly above the key in the display.
aMenu name, hereContact
bSoftkey Fav. / All:Switches between the listsContact / Favourites.
cSoftkey DeleteDeletes a saved contact.
dSoftkey Details:Press this to display more saved phone numbers for a contact.
e→Fav. / →Fav.:Turns a contact into a favourite or favourite into a normal contact.
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