| 3U TELECOM GmbH Deutschland | |
|---|---|
| Registered office: | Marburg |
| HRB: | District Court of Marburg under HRB 5330 |
| Board of Directors: | Uwe Knoke, Christoph Hellrung |
| Sector: | Telecommunications |
| Ownership structure: | 100% 3U HOLDING AG |
| In the group since: | 2007 via spin-off and re-establishment |
3U TELECOM GmbH stands for integrated telecommunications, private cloud and data centre services in Germany with its own infrastructure. A transparent pricing policy and an experienced team form the basis of our corporate strategy. Attractive and market-driven products and efficient organisation are the basic prerequisites for succeeding in a competitive environment and operating profitably. This is based on a modern, high-performance network infrastructure, the operation of our own data centres, above-average availability and excellent customer service.
Further information is available at 3utelecom.de
| cs communication systems GmbH | |
|---|---|
| Registered office: | Pleidelsheim |
| HRB: | District Court of Stuttgart under HRB 203567 |
| Board of Directors: | Uwe Knoke, Jörg Dießner |
| Sector: | Telecommunications |
| Ownership structure: | 100% 3U HOLDING AG |
| In the group since: | 2023 through acquisition |
cs communication systems GmbH is a medium-sized systems house for communications and data technology with headquarters in Pleidelsheim near Stuttgart and branches in Marburg, Leipzig and Nuremberg. As a provider of high-quality products in corporate communications, the company has firmly established itself on the market under the ‘citrus’ brand since its foundation in 1990. Public administrations and medium-sized companies in particular benefit from the innovative citrus products in the field of (cloud) telephone systems and unified communication security. In 2025, cs expanded its portfolio to include digital workplace, managed network & security and managed server solutions. These services are always tailored to the individual needs of each customer. Particular emphasis is placed on personal customer service, short response times and a fair pricing structure.
Further information is available at citrus.tel
| 3U TELECOM GmbH Österreich | |
|---|---|
| Registered office: | Vienna |
| Registered: | Commercial Court Vienna under FN202682m |
| Board of Directors: | Uwe Knoke, Christoph Hellrung |
| Sector: | Telecommunications |
| Ownership structure: | 100% 3U HOLDING AG |
| In the Group since: | 2000 through new formation |
3U TELECOM GmbH has been operating on the market as a telephone company based in Austria since 30 November 2000. 3U TELECOM offers a nationwide product line for telephony of high quality and good capacity. Under economy Preselection code 1024, 3U offers long-distance calls, international calls and calls into the mobile networks via the easy dial-around method as well as via the preselection method at very reasonable prices.
Further information is available at www.3utelecom.at
| LineCall Telecom GmbH | |
|---|---|
| Registered office: | Marburg |
| HRB: | District Court of Marburg under HRB 4676 |
| Board of Directors: | Uwe Knoke, Christoph Hellrung |
| Sector: | Telecommunications |
| Ownership structure: | 100% 3U HOLDING AG |
| In the Group since: | 2002 through new formation |
LineCall Telecom GmbH has been on the market as a telephone company for preselection marketing to private and business customers in Germany since the beginning of 2002. Ever since early 2008, LineCall Telecom has been operating successfully on the dial-around market through the start of network provider code 01067.
Further information is available at linecall.de01067.net
| OneTel Telecommunication GmbH | |
|---|---|
| Registered office: | Marburg |
| HRB: | District Court of Marburg under HRB 4985 |
| Board of Directors: | Uwe Knoke, Christoph Hellrung |
| Sector: | Telecommunications |
| Ownership structure: | 100% 3U HOLDING AG |
| In the Group since: | 2003 through acquisition |
OneTel Telecommunication GmbH is an established telecommunications company which has generated impetus in the market as a network provider for voice telephony since 1999. At that time the company formed part of the Australian OneTel Corp. in Sydney, Australia. The new OneTel Telecommunication GmbH adopted the brand name, which is known worldwide, and took over the existing business and private customers, as well as the established network operator code 01086, which is well positioned on the dial-aroun market.
Further information is available at onetel.de
| RISIMA Consulting GmbH | |
|---|---|
| Registered office: | Marburg |
| HRB: | District Court of Marburg under HRB 5681 |
| Board of Ddirectors: | Christoph Hellrung, Uwe Knoke |
| Sector: | Software reseller and solutions provider |
| Ownership structure: | 100% 3U HOLDING AG |
| In the Group since: | 2010 via spin-off |
RISIMA Consulting GmbH is a value-added reseller (VAR) specialising in contract and document software, providing support in particular to legal professionals, law firms and the legal and compliance departments of large companies and corporations. RISIMA is one of the market leaders in Germany, Austria and Switzerland and also an important strategic partner of Litera for the entire EMEA region. Its portfolio includes Litera’s software solutions, supplemented by consulting, training and German-language support. As part of the 3U Group, RISIMA also benefits from additional IT resources and synergies within the group.
Further information is available at risima.de
