Welcome to the new phone system


As part of the network renewal at RWTH Aachen University, one component is the procurement of a pure VoIP (Voice over IP) telephone system. The provider must meet high requirements in terms of data security and future viability. Important aspects of the tender are;

  • All data paths between the components of the telephone system must be encrypted according to the state of the art.
  • All centrally managed end devices must be fully functional in pure IPv6 networks.

After the tendering process, RWTH Aachen University purchased a telephone system of the type Cisco Unified Communications Manager, or CUCM for short.

With the installation of the new telephone system, a paradigm shift will take place: In the previous Alcatel Lucent telephone system, telephone numbers were bound to telephones; in the CUCM telephone system, telephone numbers are bound to a person. This opens up additional possibilities for the user to create flexible communication independently. 

To be able to use all the advantages of the new TC system, use the TC portal (Access only with employee status) and activate Webex.

Advantages for employees

  • Mobile accessibility under the business phone number even outside the RWTH
  • Individual definition of personal availability times through forwarding
  • Self-management by users
    • Reduction of waiting times for users
    • Activation and deactivation of individual features

All this through the new TC portal (Access only with employee status) and Webex.


Main functional features

  • Hardware phones, software client for PCs, mobile client for smartphones
  • Video telephony on all platforms
  • CTI (control and integration of software client with phones)
  • Call lists of incoming, outgoing and missed calls
  • Contact list, chat function, display of presence information
  • Full encryption
  • Blocking and protection by PINs/passwords
  • No call forwarding to cell phone necessary

Softphone Webex

  • The Webex Client is software for your PC, laptop and smartphone
  • Simplify your home office with the Webex Client
  • Connect the Webex Client to your work number instead of using your private number

How to download the Webex client and log in is explained step by step in the following instructions:

Download Webex-Clients

Activation of the Softphones in TC-Portal

 Login to the Webex Client (Windows)