CNT AG
CNT AG
As the oldest Internet Service Provider in Germany, CNT introduced the first true Cloud PBX for large enterprises.
CNT® stands for Communication Network Technologies and, like few other companies in Germany, represents extensive experience, high expertise, and consistent continuity in Internet and telecommunications. CNT continually sets standards and develops innovations that are second to none.
Internet Service Provider since 1995
CNT is one of the most renowned Internet Service Providers, providing Internet access and site networking for medium and large enterprises in Germany, Europe, and worldwide. Today, CNT is the oldest ISP in Germany, having offered its Network Services nationwide since 1995.
VoIP Pioneer
As early as 2001, CNT replaced traditional telephone lines with the then-new Voice-over-IP technology, before the SIP standard was established. Since 2008, CNT has relied on its own Cloud PBX (virtual telephone system) and is pioneering the future of cloud solutions.
Years
Internet Service Provider
Years
Telecommunications
Years
Voice over IP
Countries
in Europe and worldwide
Communication Excellence combines for us ambition and passion. With pioneering spirit and experience, we strive daily to elevate communication to a new level. Our enthusiasm drives us to continually set new standards.
New Paths in Telecommunications
Innovative telecommunications solutions create perspectives and concepts that meet business objectives and open up new strategic and operational opportunities.
Commitment to Excellence
Excellence shapes our self-understanding in every respect – from individual consulting to tailored offers to the reliable and timely implementation of all services. The foundation for this is formed by highly qualified employees, mature products, and a consistent quality management.

History
1995: The Beginning of Commercial Internet Use
At a time when the commercial use of the internet was still in its infancy, CNT, in collaboration with IBM, provided internet access via leased lines and site networking for business customers across Germany. Just a few months later, CNT took over the support of IBM AS/400 partners in Southern Germany as well as renowned clients like Daimler – a true pioneer in this field.
Foundation of CNT Kommunikationssysteme GmbH in Wörth am Rhein
Nationwide internet access in collaboration with IBM, innovative hosting services, global domain registrations
Support for IBM AS/400 partners in Southern Germany
Supplier for regionally active internet service providers
Relocation to Karlsruhe
Transformation into CNT Systeme und Netze AG (later rebranded to CNT AG)
Acquisition of the data center in Frankfurt am Main
Introduction of telecommunications services
First VoIP connection using H.323 gateways to all public telephone networks
Acquisition of Crown Neue Medien GmbH in Hamburg and establishment of the Hamburg office
Hybrid PBX as Hosted PBX: Experiences with deployment at own locations
Hamburg HafenCity: Opening of the location
Jever office: Establishment of the sales location
Largest known hosted PBX project based on an IP PBX (more than 500 users and 20 locations)
Start of development for the custom-built cloud PBX
CNT Call Manager: Presentation at CeBIT 2011
New headquarters in Karlsruhe, occupancy after 18 months of construction
Standardized SIP trunks in many countries across Europe and in the USA
Cloud PBX is "feature-complete"
Resale partner program for CNT Call Manager
Technical operation of the Corona vaccination hotline for two federal states
Expansion of CNT Call Manager to include all UCC services: Video conferencing with screen sharing and chat
CM App, the desktop app for Windows and macOS
International coverage as a carrier in many more countries across Europe and worldwide
CM Mobile App, the smartphone app for iOS and Android