Bluetooth
A Bluetooth headset can be connected using wireless Bluetooth technology (prerequisite: Bluetooth 4.0). The maximum range in the Bluetooth network is 10 m.
Connection 
aNetwork port
bDirect PC connection via network cable
cHeadset socket
dReceiver socket
eUSB port (for COMfortel D-Wireless (EZC-5200BS), USB headset, USB mass storage)
fRubber cover: To connect a COMfortel D-XT20 or COMfortel D-XT20i key extension module, remove the cover and attach it to the extension module.
gUSB port, exclusively for connecting a COMfortel D-XT20 or COMfortel D-XT20i key extension module.
Configuration
*Important: The procedure described below ensures that all components react correctly:
Plug in the COMfortel D-Wireless dongle (EZC-5200BS) when the device has no power supplied to it
Web interface: 
Function keys > Choose a key > Function: Bluetooth
*Details about the settings are in Function keys
Phone: 
Settings > Bluetooth
*Details about the settings are in Bluetooth
Settings > Function keys > Choose a key > Function: Bluetooth
or
In the touch function keys area on the home screen > Add entry to list > Function: Bluetooth
*Details about the settings are in Function keys
Provisioning: 
*Further help in the Auerswald DokuWiki
Process 
1.Plug the COMfortel D-Wireless Bluetooth dongle (EZC-5200BS) in the USB port provided for that purpose.
2.The following option is added to the menu: Settings > Bluetooth.
3.If you select the Bluetooth function, a list of all accessible Bluetooth devices is displayed.
4.Select the device to which a connection is to be set up.
5.When the connection has been established, the selected devices is added to the list of coupled devices.
*Note: If a Bluetooth headset is used, there must be no other pairings with other Bluetooth devices. Deactivate Bluetooth on devices in range.
6.To close a connection, select the paired device in the list and then select OK at the prompt to confirm.