COMpact 4000

Article number 16118

Partly modular and compact ICT system (VoIP, ISDN, POTS) with a maximum of 10 trunk lines and 16 subscribers, with 2 module slots, in a wall-mountable cabinet.


  • Up to 16 VoIP subscribers
  • Up to 12 ISDN subscribers
  • 8 analogue subscribers
  • Up to 12 VoIP channels simultaneously, can be configured for external (internet telephony), internal or flexible use
  • System telephony with digital VoIP an ISDN telephones from the COMfortel® series

COMpact 4000
COMpact 4000
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The COMpact 4000 seamlessly adapts to any operating environment and takes care of full network integration in next to no time at all. Its setup assistant helps you enter all basic settings and get the system ready for operation within minutes.


Based on a basic setup which already meets most of the connection and equipment requirements the system can be expand with two plug-in modules for universal ISDN and analogue trunk lines. And there is a host of convenient functions, such as integrated voicemail and fax, CTI and UC capabilities, full VoIP integration and interfaces for house automation systems – everything that makes up modern telecommunications is on board.


If you are looking for a modern, small communications center for all traditional and IP-based connections, you are perfectly served with the COMpact 4000.


Features & technical data

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System functions

  • Trunk line authorisations for reduction of costs and for multi-company operation
  • System profiles (10 configurations max.) switchable by internal clock or manually by phone (internal and external)
  • Door terminal to exchange line calls (pharmacy function)
  • Automatic system-wide exchange line request
  • Busy-on-busy for internal and external calls, dynamical applicable for logged-in Call Agents

SIP convenience features for standard SIP phones

  • SIP-BLF, Busy Lamp Field acc. to RFC 4235 (4)

  • Pick-up pre-check (4)

  • SIP-MWI (Message Waiting Indication), monitoring of the central voicemail and fax boxes acc. to RFC 3842 (4)

  • SIP text messages acc. to RFC 3428 (4)

  • Auto provisioning and status LEDs (4),(6)

Central address books

  • 2,000 contacts incl. photo, addresses and phone numbers
  • Separate address books for departments and multi-company operation
  • Comfortable operation via COMfortel system phones
  • Security access levels for administrator and user
  • Address book provisioning via LDAP

Building and home automation

  • Max. 24 actuators, e.g. a/b Switching Modules or via http with IP switching relays
  • KNX/EIB integration via IP, e.g. with GIRA HomeServer

  • Time or key controlled operation of heating systems, aircondition lighting or blinds (1)

  • Full integration of VoIP and analogue door intercom systems
  • Support for IP video intercom systems (1)

VoIP telephony

  • 4 VoIP channels (external / internal) included, expansion to 12 VoIP channels possible
  • Dynamic internal/external VoIP channels
  • Fax over IP external (T.38 acc. ITU-T)
  • Remote extensions and mobile VoIP clients integration
  • MSNs in SIP-Trunk simultaneously

Voicemail and fax

  • Excellent sound quality due to optimised echo cancellation and wideband audio with G.722

  • 1 voicemail channel and 1 voicemail box included
  • Expansion possible to a maximum of 4/0 or 3/1 channels for voicemail/fax with 20 boxes each
  • Fax sending via the network (Windows 7/8/10 and Mac OS X), extension required (4)

  • Storage of the voice and fax messages on USB memory (not included)

UCC functions

  • Call setup and ending via the PC, incl. Outlook plug-in (4)

  • Presence management with automatic status detection (4)

  • Instant messaging for a better sharing of information (4)

  • Contact data for local users and out of external data bases (4)

  • Softphone functionality for Windows, Android and iOS

Software interfaces

  • Recalling call data via SFTP
  • LAN TAPI (4 clients in scope of delivery)

  • Online name search (reverse search), adaptable
  • PBX Control API, e.g. retrieve caller lists, call forwarding ON/OFF, configuration switching, sending of fax/voicemail, switching relays, alarm status (start, acknowledgment, timeout), hotel (room status, call list, wake up call) 

Installation and maintenance

  • Administration via web interface, secure access via https
  • System access local via Ethernet and remote via Internet
  • System software update via local or remote PC upload
  • Central configuration of IP telephones (security by using certificates)
  • Auto provisioning for telephones of other brands (6)

Unlockable options

  • Expansion from 4 to 8 VoIP channels, thereof up to 4/0 or 3/1 channels for voicemail/fax, incl. 20 voicemail and fax boxes
  • Expansion from 8 to 12 VoIP channels
  • Auto Attendant (4)

  • LAN-TAPI (for all subscribers), 4 included (4)

  • SIP comfort package brand plus included auto provisioning for standard SIP phones (4),(6)

supplementary smartphone apps

  • PBX Manager with Switching of call forwardings Log-in/-out in groups Retrieving of messages

Please note: information depending on the configuration level of the system. For detailed information please refer to the datasheet. Subject to modification.

Technical Highlights
Dimensions Height (mm) 331 / Width (mm) 334 / Depth (mm) 94.5
S0 ports 3 / Analogue switched lines (DTMF, CLIP capability) 4 / VoIP channels (SIP as per RFC 3261) 10 / External channels (mixed analogue, S0, VoIP) 10
Analogue subscriber connections (symmetrical, pulse dialling/DTMF, CLIP/CNIP capability) 8
Audio outputs (via analogue ports) 4
Operating voltage Voltage (V) 230 / Tolerance (%) 10 / Frequency (Hz) 50
Operating systems Windows 7/8/10, Apple Mac OS X and Linux
Fax default T.30/T.38 as per ITU-T
Casing material Plastic, chassis with lid
Weight (g) 1600 / Unit g
Internal S0 ports, multi-device connectivity (PTMP, Euro ISDN, DSS-1) 6
Power consumption minimum (W) 3.2 / maximum (W) 55
Module slots COMpact 2BRI, 4FXS, 2FXO 2 / (not for 4FXS)
PC connections (10/100 Base-T (10/100 MBit/s, twisted-pair), full/half duplex, auto-negotiation) PC connections (10/100 Base-T (10/100 MBit/s, twisted-pair), full/half duplex, auto-negotiation) 1
Range (approx.) of internal S0 ports 150
Range (approx.) of UP0 ports Range (approx.) in m 1000 / for cable diameter (⌀) (mm) 0.6
Range of analogue ports Resistance (Ω) 2 / Resistance factor (Ω) 50 / Range (approx.) in m 800 / for cable diameter (⌀) (mm) 0.6
Switch relay (Auerswald a/b switching module or IP switch relay) 24
Door intercom connections (to analogue TLN connections or as VOIP TLN) 8
UP0 ports, multi-device connectivity (PTMP, Euro ISDN, DSS-1) 6
Voice mail and fax Number of channels 4 / Number of voice mail/fax boxes 20
VoIP codecs on the exchange line G.711, G.726, iLBC, G.722, G.729
VoIP codecs internally G.711, G.726, iLBC, G.722
VoIP channels internally (SIP as per RFC3261) 12
VoIP subscriber (with over-commitment) 16
Delivery scope
  • Basic unit
  • Ethernet cable
  • ISDN cable
  • Installation Instructions and Setup Guide
  • Mounting hardware (screws and dowels)

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Datasheet download

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Telecommunication solutions for healthcare – Doctor's surgery

Auerswald provides the best formula for practising doctors
Sector Employees
Healthcare 5
Marcus W., General Practitioner with 5 employees

"It is hard to imagine how difficult it would be to organise the practice without our new PBX – a COMpact 4000. Now, when a patient calls, their file opens on the computer monitor automatically. Patients also appreciate that they can get through straight away, because there is effectively no longer a 'busy' response. Things such as opening the door or adjusting the answering machine don't require any further action and there is no need for an additional device to make announcements in the waiting and treatment room. The COMfortel 2600 IP that we have in reception easily takes care of this. Thanks to the connected cameras, it also provides an overview of both waiting rooms. With the constant change from one treatment room to the next, the cordless DECT telephones, together with the base station COMfortel WS-400 IP, ensure that everyone can still be reached and, where this is not possible from time to time during a treatment, then the personal voice mailbox takes over. All in all, we have not only become easier to contact and thus more flexible, but significantly less time is being spent on administrative tasks. I also find it particularly convenient that the door intercom – also from Auerswald – can switch over to the mobile telephone and can be programmed in such a way that an announcement is played back. And if an emergency call is needed – thankfully a rare occurrence – I can rely on the system, even to interrupt an incoming call."

Telecommunication solutions for agencies and law firms – Legal firm

Justly valued by legal firms when it comes to technology
Sector Employees
Agencies and law firms 6
Sven v. D., Law Firm Partner with 6 employees

"We sometimes wonder how we actually managed to organise work in the law firm before we had the COMpact 4000 installed last year. The first good news was that we could continue to use our existing analogue lines. One point to the new PBX. The 'automatic switchboard' that connects every client directly to the right contact is also particularly useful. And, with the connection of our software to the PBX via ESTOS ProCall Enterprise, we were able to kill several birds with one stone: information on the current situation is provided during client calls and is also supported in reporting. The data collected from every telephone call includes the call charge as well as the duration of the call, and we can now simply assign this to each client – this is literally a valuable basis for accounting."

Telecommunication solutions for agencies and law firms – Tax consultant

Why we advise the tax advisers
Sector Employees
Agencies and law firms 5
Patrick B., Independent Auditor and Tax Consultant with 5 employees

It might be surprising to many people, but callbacks and telephone consultations make up a large proportion of our work as tax consultants. When looking for a new PBX, I settled on a COMpact 4000 from FONtevo – it covers everything we could possibly have imagined: we wanted to keep the telephone connection and all digital peripherals, to integrate our customer database and a couple of additional convenience functions that make work easier for me and my employees, e.g. having all current data for a client displayed on the monitor as soon as they call. Think about the time saved simply by selecting a number with the click of the mouse. On the other hand, we use VoIP for the integration of external extensions. It is currently being used for the home office of a colleague who is working from home due to a new addition to the family. I also use the IP telephone in my home office and use it to connect directly with the systems in the office via the internet and a so-called VPN tunnel. For the phones, we have various models from the COMfortel range, one of which, the COMfortel 1400 IP, is an IP telephone. If the doorbell rings, it displays the camera image from the entrance. This means you can prepare if someone there wants to speak straight away.

Telecommunication solutions for agencies and law firms – Insurance agency

Technology that quickly pays for itself for insurance and financial service providers
Sector Employees
Agencies and law firms 12
Petra S., Agency Partner with 12 employees

"I was aware of the theory behind the fact that good office organisation is only half the story of course but to what extent the installation of an ICT system would bring us closer to this goal remained to be proven. We were impressed with the COMpact 4000 immediately, and not just because it always looks for the most economical dialling code automatically – even for mobile telephone calls when on the road. For us, it was important to be able to call customers via Outlook with a single mouse click for example. As was the ability to operate door intercoms through the telephone. This not only works through the COMfortel 1600, which all workstations are equipped with, but my cordless telephone COMfortel M-210 can do this as well. All-in-all, the system has proved to be beneficial: our customers are connected directly to the desired contact by the 'automatic reception' and the call charges for all calls are recorded in our accounting systems. Furthermore, because the system is connected to our database, in addition to seeing which client is currently calling, their business data is also shown on the monitor immediately. I find the 'PBX Manager' particularly useful – it is an app I can use from home on my smartphone to see who has tried to contact me or sent me a fax."

Telecommunication solutions for agriculture and forestry – Organic farming

Productive solutions for agriculture and forestry
Sector Employees
Agriculture and forestry 4
Steve P., Organic Farmer with 4 employees

"Our dairy farm doesn't generate much customer traffic – apart from our farm shop. Naturally, contact with the dairy I do most of my business with, has to work every time. As a result, I have had a cordless DECT system with two handsets COMfortel M-100 specially installed, so that I can be reached anywhere on the farm. In any case, calls are also forwarded to my mobile telephone when I'm out and about. The thing that clinched it for the new COMpact 4000 PBX was the easy control over cameras: whenever a cow is about to begin calving, I mount a mini camera in their stall and then I can monitor her on my desk phone COMfortel 1400 IP. A brief glance is all it takes for me to decide whether it is necessary to go out or not."

Telecommunication solutions for trade and production – Joinery

Customised for the requirements of trade
Sector Employees
Trade and production 14
John F., Independent Master Carpenter with 14 employees

"What does a craft workshop need a PBX for? Probably to ensure the same thing that everyone wants: to be contactable any time, anywhere, to hear from the ringtone whether it is a private or business call, answering machine at least for the foremen, etc. You would have to ask my secretary if there's anything else I've missed that it can do. All I know is that she is absolutely thrilled with her desk phone with lots of keys and a large colour display (COMfortel 2600 IP with Xtension300). We now have eight cordless telephones (COMfortel M-100) at the start that vibrate and flash when there is an incoming call – this is recognisable everywhere, even if a saw is being used nearby. However, the engineer who set up the system (COMpact 4000) was something of an experimenter. He connected a motion detector to our door terminal system and knew a trick enabling us to switch the alarm system on and off via the telephone. This means that if an assembly group returns late in the evening, for example, I can 'release' the door from my mobile telephone without the alarm going off. For this alone it has already been worthwhile."

Telecommunication solutions for family and career – Family home

The solution of choice for the aspirational private user
Family and career
Sebastian L., Sales Manager, family man and techie with 0 employees

"The fact that we now have a COMpact 4000 at home is partly down to my 14-year-old son – he probably inherited his enthusiasm for all things technical from me. Two things tipped the scales in its favour: the long planned switchover to VoIP and the foolproof integration of various peripheral devices. The images from a total of five web cams installed in and around the house, from the tree house to the hamster cage, can now be retrieved on the telephone display of my COMfortel 3600 IP at the touch of a button and, if the doorbell rings, we can view the image from our video door intercom immediately. My son even managed to set the time control for the house lighting by himself. And since he was allowed to add a WLAN access point of his own for him and his sister, he is now in her good books too. They were thrilled with the new quality when streaming videos. In theory, I can also use the system to block expensive value added and service phone numbers but I don't think that is necessary for my children. It might sound as though I only purchased the system for the fun of it, but that isn't the case. Firstly, it helps make savings, secondly I don't need to guess if a call might be for me every time the phone rings, and thirdly I feel more independent thanks to the 'multi-path call forwarding', even though every member of the family has their own voice mailbox and fax box. Speaking of independence: with the 'PBX Manager' app, I am even able to control the system from my smartphone when I'm out and about."

Telecommunication solutions for family and career – Home office

The solution for juggling work and family life!
Sector Employees
Family and career 1
Anthony K., Self-employed with 1 employees

"As a freelancer I treasure being able to spend time with my family whenever I can. Having said that, it is important that my customers don't realise that my office is at my home. A system that makes it absolutely clear from the ringtone whether an incoming call is for business or is private was therefore just as essential as a separate overview of charges for private and business telephone calls. This isn't the only requirement that the COMpact 4000 fulfils: my company has its own voice mailbox and fax box – and so does every member of the family. So now everyone can feel responsible for operating the door intercom and door opener. The best thing is that this system makes me more independent – an app downloaded onto my phone makes sure of it. Thanks to the app PBX Manager, I can conveniently control important functions and retrieve both voicemails and faxes, all while out and about. What's more, I also treated myself to the COMfortel 2600 IP – it is extremely comfortable, can create call connections with a single keypress, forward calls to another telephone or my mobile telephone and change the announcement on my answering machine. And my family? They are delighted to have the freedom of the cordless COMfortel M-100 telephone and, of course, also that they can call each other in the house free of charge. Incidentally: outside of my business hours, in the evenings and at the weekend, the system is switched to sleep mode. This switches off the energy-saving displays and LEDs, but they still remain active."

Sales partners

Following partners do not only know the FONtevo products but as well the country-specific characteristics you will always find in telecommunications. Here you will get the matching products with the adaptations for the telephone network of the relevant country plus support if questions will come up.

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