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PBX Call Assist 5

Whether at a fixed office workplace or mobile via smartphone: PBX Call Assist 5 is an extremely versatile software communication solution with which you can be reached anytime, anywhere.

PBX Call Assist works across platforms and supports Windows, macOS, iOS & Android. Not only can you improve your collaboration and communication internally, but you also have a uniform connection to partners, suppliers and customers across company boundaries.

Downloads

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Designation
Operating system

PBX Call Assist 5

V8.9.3.11556 (Stable) | 12.03.2026
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows 11
macOS 14 "Sonoma"
macOS 13 "Ventura"
Windows 10 (ab Version 1903)
Windows Server 2025
macOS 26 "Tahoe"
macOS 15 "Sequoia"
Go to download

PBX Call Assist 5 Mobile

2025.11.11 (Stable) | 29.01.2026
Google Android
Apple iOS
Go to download

Documentations

LanguagesCurrent version
Installation, configuration and handling V8.8.3.10865 PDF
V8.9.3.11556 PDF
V8.9.3.11556 PDF
V8.8.3.10865 PDF
Installation and configuration - UCServer V8.9.3.11556 PDF
V8.9.3.11556 PDF
V8.8.3.10865 PDF
V8.8.3.10865 PDF
Privacy Policy for PBX Call Assist 5 V03 12/2025 PDF

Privacy Policy for PBX Call Assist 5

Language:

  • German
  • English
  • French

FAQs

Filter by: Show all Operation General Operation Software LAN-TAPI

Requirements

  • Each user must have a valid PBX Call Assist 5 license with active software maintenance.
  • The UCServer must be on the latest release (version 8.8.3 or higher).
  • The UCServer's operating system is MS Windows Server 2016 or higher. The .NET Framework 4.8 is installed.
  • The UCServer must be accessible from the internet:

via UCConnect / Mobility Services (a paid additional service from Estos)

- or -

configured according to the Estos best practice article https://support.estos.de/en/procall-enterprise/best-practice-ucserver-fuer-procall-mobile-apps-einrichten

 

Compatible web browsers

Chromium-based browsers, for example:

  • Google Chrome™
  • Microsoft® Edge
  • Mozilla Firefox®
  • Apple Safari

The following are not supported:

  • Microsoft® Internet Explorer
  • Google Chrome or Mozilla Firefox on mobile devices such as iOS
  • Old versions of Microsoft® Edge (without Chromium)

 

PBX Call Assist Web does not support use on mobile devices such as smartphones or tablets running Android or iOS.
The respective PBX Call Assist Mobile App (for Android or iOS) should be used.

Note: The PBX Call Assist Client for Windows should be closed before using PBX Call Assist Web, if necessary.

Port Forwarding

The PBX Call Assist Web WebRTC application runs as a website (https://auerswald.procall.de) within a web browser and is delivered via the https protocol. This requires the https port (443, outbound) to be forwarded.
In summary, the most common port forwarding requirements for WebRTC are:

  • Ports 80 and 443 for signaling
  • Port 3478 (UDP and possibly TCP) for STUN
  • Port 5349 (TCP) for STUN over TLS
  • Ports for TURN relays, if required