COMtrexx® Business

COMtrexx Business is a manufacturer-assembled solution for up to 150 users with up to 40 simultaneous calls. The optionally integrated gateway supports up to 20 analogue terminals. With the expansion option of an additional Ethernet port, the system becomes a real all-rounder.


Operating system

Version 1.6.4 (Stable) | 22.06.2022
1.0.4 (Stable) | 30.03.2022
Google Android
Apple IOS
V7.4.2.5993 (Stable) | 02.06.2022
Windows 10 32-/64-Bit
Windows Server 2022
macOS High Sierra (10.13)
macOS Mojave (10.14)
Windows Server 2012 R1 (limited range of functions/eingeschränkter Funktionsumfang)
Windows Server 2019
Windows Server 2012 R2
Windows Server 2008 R2 Service Pack 1
Windows Server 2016
Windows Server 2008 R2
Windows 7 32-/64-Bit SP1
Windows 11
macOS Catalina (10.15)
5.5.9 (Stable) | 30.03.2022
Windows 11
Windows 10 32-/64-Bit
Windows 8.1 32/64 Bit (Windows RT is not supported/wird nicht unterstützt)
V1.4.4.1 (Stable) | 09.07.2020
Windows 10 32-/64-Bit
Windows 7 32-/64-Bit SP1
Windows Server 2008 R2
Windows 2012 Server
Windows 2012 Server R1
V (Stable) | 23.06.2021
Windows 10 32-/64-Bit
Windows 8 / Windows 8.1 (32-Bit/64-Bit / Windows RT wird nicht unterstützt)
Windows Server 2012 R2
Windows Server 2012
Windows 2012 Server R1
Windows Server 2019
Windows Server 2016
Windows 2012 Server
Windows Server 2008 R2
Windows 7 32-/64-Bit SP1
Windows Server 2012 und Windows Server 2012 R2
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LanguagesCurrent version
COMmander/COMpact PBX as a/b gateway V01 03/2022 PDF
V01 03/2022 PDF
V01 03/2022 PDF
Advanced Information V04 03/2022 Online PDF
V04 03/2022 Online PDF
Instructions V03 03/2022 PDF
Statements of conformity V03 06/2020 PDF

Advanced Information

General information

Help/Instructions for COMtrexx from firmware version 1.6.0


New descriptions

a/b gateway

COMmander/COMpact PBXs from Auerswald/FONtevo as a/b gateway on the COMtrexx.

Feature level

Introduction of a feature level in preparation for future firmware versions: If there is a difference between the current feature level of the PBX and the maximum possible feature level, the full range of functions of the PBX cannot be used.

Information on Release 1.6

Contains information about the new firmware version


New function.


Changed descriptions

Remote configuration

Note on possible threats from port forwarding. ARA descriptions removed as not supported. Links to functions via external phone.


The PBX regularly carries out a comparison of the licences purchased. After purchasing additional licences, the comparison can also be started.

NAT Keep-Alive

Extended function.


Supplementary information on the PCAP format.


New entry fields for provider certificates.


Removed descriptions


Description removed as not supported.


Bug Fixes

Restoring firmware

Incorrect note on time limit removed.


Corrected information on LDAP contact groups.


Several editorial changes

General information

Help/Instructions for COMtrexx Bsuiness from firmware version 1.6.0


Changed descriptions

Important Information

Declaration of conformity: manufacturer and webseit added

First Setup

Opening the Web Interface: procedure revised


Several editiorial changes


Error messages on the SoftPhone

  • 400 - Bad Request - Provisioning in the system is deactivated. This function must be activated for successful use of the COMfortel SoftPhone.
  • 404 - Not Found - The phone does not exist in the system or no template has been assigned to it.
  • 477|480|60 - Send failed - The telephone system cannot currently be reached via any of the Auerproxy servers because it is not currently logged on to any Auerproxy.
  • 495 - unknown - The phone is no longer present on the system.
  • 502 - Bad Gateway - The telephone system is not currently logged on to the Auerproxy (either no Internet connection or Auerproxy deactivated in the PBX).

Important: The COMfortel SoftPhone is available licence-free for a limited period of time. The COMfortel SoftPhone can also be used in the tryout mode in the COMtrexx. For permanent use, please contact your dealer or system partner.


Configuring the use of the COMfortel SoftPhone in the COMtrexx


  • Requirement: Firmware from 1.6


  1. Activate the proxy service to use the COMfortel SoftPhone under Administration > VoIP > Proxy server for COMfortel SoftPhone > Use proxy
  1. Set up the phone and assign it to a user under Telephones > Assignment > +New

Note: Softphones are very often not tied to a location and are therefore created by default without a location. The correctly assigned location is necessary, among other things, so that the PBX can properly initiate an emergency call.

  1. Enter an e-mail address for the transmission of the registration information.

Install Softphone in the device

The installation file for the COMfortel SoftPhone can be found here: COMfortel® SoftPhone

COMfortel SoftPhone Mobile: The clients are installed via the Google Play Store or Mac App Store.


Enter user name and password in the softphone

Note: The registration information for the COMfortel SoftPhone is emailed to the user when the phone is set up. Sending can be restarted later (e.g. after changing the user):

Note: The registration information can be copied here: