PBX Call Assist 5

Unified communications solution with CTI, cross-media presence management and individual/group chat

SIP softphone for maximum flexibility and mobility in your day-to-day work routine

Screen sharing for smooth cooperation

Platform-independent – multi-device support with free choice of device

VideoChat from client to client

Presence management – availability of your employees at a glance

Your advantages in detail

With PBX Call Assist 5, companies are able to improve their communication and collaboration internally and across company boundaries with partners, suppliers and customers.

In addition to CTI, instant messaging and a Microsoft Teams app for Windows including synchronized presence management, PBX Call Assist 5 also offers options for audio/video communication (WebRTC-based). Extensive softphone functions (SIP) and smartphone integration via Bluetooth on the Windows clients are also included.

You can obtain the PBX Call Assist 5 software and the user licenses directly from the online shop. Without user licenses, the software can be used as a demo version for 45 days.

Compatible products

Features & technical data

Everything you need to know about our products comes now. Scroll down for more information.

Softphone functionalities

  • dial number
  • Call reject
  • Call accept
  • On hold
  • Call query
  • Reject in call status
  • Forwarding in call status1
  • Forwarding during a call1
  • Establish inquiry1
  • Call brokering1
  • Connect inquiry1
  • Conference1

Presence management

  • Automatic presence state detection:
    - Online and available
    - Online and busy
    - Online but absent
    - Online but inactive
    - Offline
  • Manual presence state setting:
    - Busy
    - Available
    - Do not disturb
    - Absent

Instant messaging

  • Sending text messages between two or more PBX Call Assist clients
  • Easy sharing of files, photos and videos via Windows and mobile apps via a central storage location

video chat

  • VideoChat accept
  • VideoChat reject
  • VideoChat initiate

computer smartphone integration

  • Bluetooth® pairing with the Windows PC
  • Search in smartphone contacts via the Windows PC
  • Hotkey Support
  • Control of smartphone telephony via PC client
  • Journal support

data sources

  • Active Directory
  • Das Telefonbuch
  • DATEV pro
  • Google Apps for Work / G Suite
  • Herold
  • IBM Notes databases
  • KlickTel
  • TwixTel
  • LDAP (OpenLDAP, requires MetaDirectory license)
  • Microsoft Dynamics AX, CRM and Navision
  • Microsoft Dynamics CRM Online
  • Microsoft Office 365
  • OBDC (Access, SQL Server, MySQL)
  • Public Exchange directory
  • Salesforce

CTI functions

  • Outgoing call dialling with:
    - Direct phone number input
    - Context menu (right click on the contact)
    - Selecting a phone number and executing via hotkey
  • Displaying incoming calls in the call window
  • Supported TAPI functions:
    - Call accept
    - Call reject
    - Call end
    - On Hold
    - Query call
    - Call forwarding
    - Pick-up (not across different sites)
    - Conference (3PTY)
  • Call forwarding set/delete
  • Call protection set/delete
  • List of missed calls
  • Notes set/delete
1 just for the Windows client

System requirements client PC hardware




2 Core @ 2 GHz


8 GByte

Hard drive capacity

1 GByte


100 Mbit

System requirements server PC hardware




2 Core @ 2 GHz


8 GByte

Hard drive capacity

10 GByte


1 Gbit/s

Operating systems 1



Terminal server

Windows Server 2012 R2

Windows Server 2016

Windows Server 2019

Windows 8.1

Windows 10

macOS Sierra / High Sierra / Mojave

iOS from 10.3

Android from 11

  • 1 ICT systems from firmware 8.0A-004

Delivery Scope

ICT System

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COMtrexx® Advanced

Ultimate performance COMtrexx Appliance 

COMtrexx® VM

Hardware independent soft PBX solution with up to 250 users and up to 250 parallel calls per system

COMtrexx® Business

Large ICT all-rounder with traditional interfaces up to 150 users

COMpact 5200R

Fully modular rack-mounted VoIP communications server with up to 20 channels to service provider, 50 subscribers max. and 5 slots

COMpact 5200

Fully modular wall-mounted VoIP communications server with up to 20 channels to the service provider, 50 subscribers max. and 5 slots

COMpact 5500R

Fully modular, expandable VoIP device for 19" racks with up to 32 channels to service provider and 112 subscribers

Top Sellers

Sales Configurator (SC)

- the easy way to the right system

Customer requirements for communication solutions are constantly increasing and with them the complexity and scalability of ITC systems. Project planning therefore takes up more and more time. Here, the free Sales Configurator offers a simple and fast solution. It gives you the opportunity to efficiently plan communication solutions and create project planning proposals.

Sales Configurator (SC)