COMpact 4000

  • Auerswald PBX system COMpact 4000
  • Auerswald PBX system COMpact 4000
  • Auerswald PBX system COMpact 4000

COMpact 4000

Made for those who like it straightforward

Our 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. This helpful feature sets it apart from its predecessors as well as from any Soft PBX or Cloud PBX. And that’s only the beginning. There’s 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. Economical, upgradeable and future-proof – in view of its outstanding sustainability, it won’t come as a surprise that COMpact 4000 was awarded with the Blue Angel label.

Flexibility is a sure winner

Despite all rumours, you won’t have to exchange your current devices just because the general switch to “All-IP” is around the corner. Even the subscriber and installation characteristics you’ve set up once will remain – no matter if you plan to change your provider or the technology. Our COMpact 4000 keeps you flexible in every respect. It’s very easy to integrate e.g. CTI clients into the system with the software “PBX Call Assist”. And whether you want to connect your analogue devices or the latest high-tech system phones – nothing will stop you. Even home automation systems will develop additional skills with it: Apart from controlling lights or the heating via the PBX system, our COMpact 4000 will even take orders from any system integrated via the network protocol, if you wish. E.g. redirect calls to your smartphone when leaving the house.

Accessible from everywhere

Thanks to automatic detection, the PBX system is immediately recognized without complex network-related settings. A web interface helps you specify all settings – via your web browser or remotely, e.g. with a tablet PC or smartphone. You don’t need a special software. You’ll soon get used to check system functions on the go, such as voicemails or the caller list. Or redirect calls, simply via “PBX Manager”, a smartphone app available free of charge at iTunes App Store and Google Play. The COMpact 4000 has many talents, but above all it’s discreet: internal phone conversations (VoIP) will always remain internal and tap-proof – thanks to full encryption.

 Symbol Made in Germany


  • Trunk line authorisations for reduction of costs
  • System profiles (10 configurations max.) switchable by internal clock or by phone
  • Door terminal to exchange line calls (pharmacy function)
  • Automatic system-wide exchange line request
  • Busy-on-busy for internal and external calls, dynamically depending on logged-in call agents
  • Call through for ISDN and VoIP trunk lines
  • Boss/secretary function1, 2
  • Direct line access
  • Speaker announcement to corded system telephones1, 2 (single and groups)
  • Bank holiday table for automatic switching of system profiles or wake-up calls
  • Call data management with 18,000 records
  • Call take-over (e.g. from integrated answering machine)
  • Group caller lists3
  • Group functions with intelligent ringing schemes (ACD functionality for call centres)
  • ISDN features like CLIP, CW, AOC, CF, CCBS
  • Least Cost Routing Soft-LCR for VoIP, ISDN and POTS
  • Call brokering, three-party conference internal / via exchange line / via 2nd call channel
  • 10 emergency numbers with special rights and prioritisation
  • Open query
  • Parallel call to any second target
  • Pick-up, specific (with pre-check1) / global pick-up
  • Project assignment of calls
  • Call diversion, follow me internal, cascadable
  • Protection against attacks with blocking, black lists, monitoring
  • Software interface
  • Call barring / exception lists, 10 each for incoming and outgoing calls
  • Announcement before answering unconditional or on busy, 10 announcements can be stored
  • Flexible rework time for call centres
  • Voicemail and fax functions
  • Waiting field1,2 for max. 10 simultaneous incoming calls
  • Music on Hold with insertable announcement, loadable WAV file
  • SIP BLF (Busy Lamp Field), RFC 4235 compliant
  • Pick-up pre-check
  • SIP MWI (Message Waiting Indication), monitoring of the central voicemail and fax boxes, RFC 3842 compliant
  • SIP Text Messages5, RFC 3428 compliant
  • Auto provisioning and status LEDs6
  • 2,000 contacts incl. photo, addresses and numbers
  • Separate address books for departments and multi-company operation
  • Comfortable operation via COMfortel system phones
  • Different security access levels for administrator and user
  • Address book provisioning via LDAP
  • Usage of Google Contacts
  • Import of VCF and CSV files
  • Max. 24 actuators, e.g. a/b Switching Modules or via http with IP switching relays
  • KNX/EIB integration via IP, e.g. GIRA HomeServer
  • Time or key controlled (COMfortel system telephones) operation of heating system, aircondition, lighting and blinds
  • Full integration of VoIP and analogue door intercom systems
  • Support of IP video intercom systems1
  • 4 VoIP channels (external / internal) included, expansion to 12 VoIP channels possible4,5
  • Dynamic internal/external VoIP channels
  • Fax over IP (T.38 acc. to ITU-T) external
  • Excellent speech quality due to optimised echo cancellation and wide-band audio with G.722
  • Integration of remote extensions and mobile clients
  • Call forwarding on busy (CFB), no reply (CFNR), unconditional
  • (CFU) at carrier trunk, configuration dependent
  • MSNs in SIP-Trunk simultaneously
  • Encrypted signalling (SIPS) and data transmission (SRTP)
  • Transfer of customer-specific numbers for outgoing calls (CLIP no screening)
  • Individual gateways for each provider
  • 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 each4
  • Fax sending4 via the network (printer driver for Windows 7/8/10 and MAC OS.X (El Capitan))
  • Storage of the voice and fax messages on USB memory (not included)
  • Recording capacity (at 4 GByte of memory):
    - approx. 120 hours of voice messages incl. announcements
    - or approx. 3,500 fax pages
  • Call acceptance and individual announcements, depending on calling number, time and call type
  • Comfortable operation via corded COMfortel system telephones
  • Substitute function
  • Voicemail and fax forwarding via e-mail
  • Remote access to the voicemail boxes incl. voice guidance
  • Softphone functionality for Windows, Android and iOS
  • Call setup and ending via PC, incl. Outlook plug-in
  • Presence management with automatic status detection
  • Instant messaging for fast information exchange
  • Contact data for local user and out of external databases
  • Screen sharing for convenient cooperation
  • „Federation" as networking concept between external sites and companies
  • Platform independent (Windows, Mac, iOS, Android)
  • COMfortel Mobile Business5
    Seamless integration in iOS and Android
    Signalizing of the business number
    Full flexibility, always reachable
  • PBX Manager with
    Switching of call forwardings
    Log-in/-out in groups
    Retrieving of messages
  • Retrieving the call data lists using SFTP
  • LAN-TAPI4 (4 clients included)
  • Online Name Search (backward searching), customisable
  • API for 3rd party software e.g. retrieving 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)
  • Administration via web interface, secure access via https
  • System access local via Ethernet and remote via Internet
  • System software update via local and remote PC upload
  • Central configuration of IP telephones (security by using certificates1)
  • Auto provisioning for phones of other brands5,6
  • Simple configuration with COMfortel IP Editor
  • Selectable authorisation levels with password protection
  • Support for IPv6
  • 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
  • Automatic Attendant
  • PBX Call Assist
  • LAN TAPI (up to all subscribers), 4 included
  • SIP comfort package brand plus incl. auto-provisioning6 for standard SIP phones

1 With COMfortel 1400 IP / 2600 IP / 3600 IP
2 With COMfortel 1400 / 1600 / 2600
3 With corded COMfortel system telephones
4 Can be activated, with costs or expansion module necessary
5 With system firmware 7.4 (Q3/19)
6 Auto-provisioning currently for phones made by Yealink and Snom

Exchange lines1 Basic setup 
Maximum setup
Sports, point-to-multipoint/point-to-point connection
0 - 22 3
Analogue trunk line (tone dialling, CLIP capable) 0 4
VoIP channels (SIP acc. RFC 3261), point-to-multipoint/
point-to-point connection (SIP trunking)
0 - 42 10
VoIP codecs trunk line G.711, G.722, G.726, G.729 and iLBC
Subscriber ports1 Basic setup Maximum setup

Switchable S0/UP0 ports , point-to-multipoint connection
(PTMP, Euro-ISDN, DSS-1)

0 - 22 6
Range of the internal S0/UP0 ports approx. 150 m / 1,000 m at Ø 0.6 mm 
Analogue ports, symmetrical, pulse/tone dialling, CLIP/CNIP capable 8 8
Range of the analogue ports 2 x 50 Ω, approx. 790 m at Ø 0.6 mm
VoIP subscribers 16 max. 16 max.
VoIP channels (SIP acc. RFC 3261) 0 - 42 12
VoIP codecs internal G.711, G.722, G.726, G.729 and iLBC
Voicemail and fax system1 Basic setup Maximum setup
Voicemail channels2 1 4
Fax channels2 0 1
Voicemail boxes / fax boxes 1 / 0 20 / 20
Fax standard T.30 / T.38 acc. ITU-T
Active and passive fax switch for analogue trunk
Door and relay connections  
Door intercom systems analogue (a/b) or VoIP (SIP) 8 max.
Door bell inputs depending on the analogue/VoIP door intercom system
Door opener relay depending on the analogue/VoIP door intercom system
Switching relays (door opener, staircase lighting, IP switch relay, a/b Switching Modul) 24
Additional connections1  
Analogue audio output for announcements (e.g. a/b Audiobox) 4 max.
Ethernet port 10/100 Base-T (10/100 MBit/s, twisted pair) 1
USB host V2.0 for printer and memory connection 1
Module slots 2
Technical data  
Operating voltage 230 V ±10 %, 50 Hz
Power consumption1 3.2 W min., 55 W max.
Housing plastic, chassis with cover
Dimensions (w x h x d) 334 mm x 331 mm x 94,5 mm
Weight (w/o modules) approx. 1,600 g
Safety CE
Supported operating systems Windows 7/8/10, Apple Mac OS X and Linux


Just in case the basic package won’t do for you:

Our COMpact 4000 has inherited all the good properties of its predecessors COMpact 2206 USB, COMpact 4410 USB, COMpact 5010 VoIP and COMpact 5020 VoIP. Therefore, it will succeed them all, pointing far into the future. Although the standard configuration contains all the functionalities that are essential to small businesses and ambitious private individuals, you can custom-tailor it to your needs – either by activating additional functions through our “Shop” or by installing the appropriate plug-in module.

COMpact 4000: 2 slots

COMpact 2BRI Module
Adds two variable ISDN ports (external/internal). When used as internal ports, either S0 (4-wire) or UP0 (2-wire) operation is possible. You can connect COMfortel system telephones or any other ISDN terminal device to the internal ISDN port.
BRI = Basic Rate Interface
Number of modules which can be used in the COMpact 4000: 2

COMpact 2FXO Module
Adds two analogue trunk lines. The Caller ID feature (CLIP/CNIP) ensures you benefit from ISDN extras even with an analogue line. Analogue-only operation is possible, but as well mixed mode with ISDN and VoIP trunk lines.
FXO = Foreign eXchange Office
Number of modules which can be used in the COMpact 4000: 2

UP0/S0 Adapter
Additional adapter for the UP0 ports, for the conversion from the 2-wire UP0 port to the 4-wire S0 port, e.g. for the connection of older COMfort system telephones.
Number of adapters which can be used in the COMpact 4000: 1 for each internal UP0 port

a/b Audiobox
Adapter for announcements via the PBX.
Number of boxes which can be used in the COMpact 4000: 4, 1 for each internal analogue port (FXS)

a/b Switching Module
Switching module to control doorbell, door opener and lighting systems via the 2-wire installation (a/b subscriber port), for TFS-Dialog 200TFS-Dialog 300TFS-Universal plus and a/b-Audiobox.
Number of modules which can be used in the COMpact 4000: 24; 6 max. for each internal a/b subscriber port (FXS)


Possible number of modules
Universal slot (U) 2
COMpact 2BRI Module
Slot U
Trunk line 0 – 2 S0 ports, Euro-ISDN (DSS-1), point-to-multipoint or point-to-point connection
Internal ISDN ports 0 – 2 S0/UP0 ports, Euro-ISDN (DSS-1), point-to-multipoint
COMpact 2FXO Module
Slot U
Trunk lines 2 analogue trunk lines (tone dialling, CLIP capable)
UP0/S0 Adapter
ISDN port 1 UP0 port to connect to COMpact 2BRI module (UP0 mode)
ISDN port 2 Sport, Euro-ISDN (DSS-1), point-to-multipoint
Housing plastic, 2 parts
Dimensions (d x h) Ø 95 mm x 33 mm
Weight approx. 100 g


a/b Audiobox

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a/b Switching Module

Read here>>


Product Overview English online 

Product overview

Brief descriptions and key features
of the entire product range

8 pages - PDF


Download now


The documents listed below are available especially for COMpact 4000:



Keine Produktabbildung

Data sheet COMpact 4000

4 pages - PDF


Keine Produktabbildung

Data sheet PBX Call Assist 3

3 pages - PDF


Keine Produktabbildung

Brochure COMpact 4000

12 pages - PDF


Keine Produktabbildung

Whitepaper COMpact 4000 - All-IP leicht gemacht

4 pages - PDF


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