HRZ is your contact for telephony at TU Darmstadt. We are the right address for you if, for example, you want to apply for a new telephone, your entry in the TU-wide telephone directory needs to be changed or you have questions about the Jabber client. We differentiate between communication in the office with fixed end devices and mobile communication via Jabber.

Office communication

Picture: HRZ

Mobile communication


The Jabber client offers telephony, video call, chat function, screen sharing and data exchange. All owners of a TU-ID can install and use the Jabber-Client.

This is how it works

Mobile Kommunikation
Picture: damircudic,

Register/change/deregister telephone

You want to apply for a new telephone, have changes to an existing telephone connection or want to deregister a telephone?

How it works