COMfortel® D-400

The COMfortel D-400 combines the practical design and elegant minimalism of the D series with the functional range of a professional communication solution for the highest demands. This guarantees impressive performance and maximum efficiency in everyday business.

High-resolution 4.3" TFT display with capacitive touch function, HD audio quality thanks to wideband and a headset connection with DHSG/EHS support for free hands when making calls – the COMfortel D-400 leaves nothing to be desired.


Filter by: Show all Firmware
Operating system

V2.2B00000 (Stable) | 15.08.2022
Show less Show more


LanguagesCurrent version
Statements of conformity D-400 V02 10/2022 PDF
Advanced Information V08 05/2022 Online PDF
V08 05/2022 Online PDF
V08 05/2022 Online PDF
Instructions V03 02/2022 PDF
Quick Guide V01 12/2019 PDF

Statements of conformity D-400

- 2011/65/EU with amendment 2015/863/EU replaces 2011/65/EC.
- EN 55032:2015/A11:2020 replaces EN 55032:2015
- EN 55035:2017/A11:2020 replaces EN 55035:2017
- EN 55024:2010+A1:2015 not applicable
- EN 63000:2018 new

Advanced Information

General Information

Help/Instructions for phones of the COMfortel D-Serie from firmware version 2.2

New descriptions

Information on release 2.2

Contains information about the new firmware version

COMfortel D-XT20(i)

New function

The function key icons can be displayed or hidden on the COMfortel D-XT20(i) key extension modules.


New function

Park position

New function

Display of the SIP display name

Changed description


New function

Gesture control can be used to switch between two different views.

Web interface: show/hide menu items

Extended function

Changed descriptions

Function keys

The entries have been added:Bluetooth,Relays,Park position, Status displayflashing yellow/shining yellow.


The entry for the LDAP server's default port has been adjusted.

Migration settings

Note on phone behaviour during an update/backup

System icons

New icons:Exchange Line,Group

Call bindings

Example added

Several editiorial changes


General Information

Instruction for COMfortel D-400 from firmware version 2.0B

Changed descriptions

Declaration of conformity: manufacturer and website added

Configuring an identity on the telephone > 5.: UI changed

Several editiorial changes


  • Determine the MAC address of the telephone.

    This is located on the packaging and back of the phone.

  • Create a VoIP subscriber with the device type "Standard VoIP telephone" in the configuration manager of the PBX under "Subscribers -> Phone numbers" and assign the corresponding MAC address to it or enter the MAC address.
  • Create a provisioning file for the device type "COMfortel D-Series" on the PBX under "Subscriber -> IP Provisioning -> File Management" and grant the subscriber access authorization.
  • Now connect the telephone. It is now assigned the corresponding settings from the assigned provisioning file and is then ready for use.

Starting with Telephone Firmware 1.4A and System Firmware 7.6B, it is possible to initiate dialling on D-Series telephones using action URLs.

If the telephone is not provisioned via the PBX, the following has to be regarded for manual setup:

  • The web server must be activated on the phone under "Menu -> Settings -> Access".
  • The first time the web server is accessed, the admin password must be changed.
  • Under "Access" the option "Allow Action URLs" must be activated and a token must be generated.
    "Action URL Server" is not required.
  • Copy the generated token and insert it on the PBX in the subscriber's properties under "Basic settings" as "CTI authorization code" (this is only available for subscribers with device type "Standard VoIP phone").


COMfortel D-Series - The new COMfortel D-400

Attractive. Efficient. Flexible. With the new COMfortel D-400, Auerswald is expanding the COMfortel D series, which was…

Setting up function key via WebUI

COMfortel D-400 Setting up function key via WebUI

Setting up function keys via phoneUI

COMfortel D-400 Setting up function keys via phoneUI

Setting up LDAP via WebUI

COMfortel D-400 Setting up LDAP via WebUI

Transferring during call phase

COMfortel D-400 Transferring during call phase

Transferring with announcement

COMfortel D-400 Transferring with announcement

Transferring with announcement via touch function key

COMfortel D-400 Transferring with announcement via touch function key

Transferring with announcement via touch function key

COMfortel D-400 Transferring with announcement via touch function key