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Mumble is a voice conferencing system with low bandwidth requirements. It transmits messages encrypted and prioritizes low latency and high voice quality.


  • Voice chat
  • Channels and subchannels that can also be set up by the user
  • Integrated, simple text chat function
  • Supported platforms: Windows, MacOS, Linux

Suitable for

  • Language exchange in research groups and projects
  • Consultation hours
  • Medium group size (up to approx. 50 persons; larger groups are conceivable, but then the voice quality will deteriorate)


  • Internet access, web browser or desktop app
  • Microphone and loudspeaker, preferably a headset
  • The setting "Push-2-Talk" is recommended
  • No separate registration required

Mumble App - First Steps

Install Mumble

  • Open an Internet browser of your choice and follow the steps indicated:
  • Go to and download the 64-bit version for the Windows operating system and install the application
  • After the installation:
  • Follow the setup steps of the Audio Assistant.
  • Click "Cancel" on the Certificate Assistant and proceed to the next instruction step.

Import certificate into Mumble

  • Download certificate
  • Call up the IMT ServicePortal and log in.
  • Go to User Management and then to Network Settings
  • Create a new certificate for Mumble and download it to your computer
  • Open Mumble and select the "Certificate Wizard" from the upper menu "Configuration"
  • Select the option "Import certificate" and import the previously downloaded certificate file

Connect to the UPB Mumble

  • Open Mumble and select the "Settings..." in the upper menu "Configuration"
  • Select the menu item "Network" on the left
  • Place a checkmark in "Suppress certificate and password storage"
  • Click below first on "Apply", then on "Ok"
  • Open Mumble and select the field "Connect" in the upper menu "Server"
  • Click on "Add server" and enter as address and 64738 as port.
  • Enter your IMT user name as your username.
  • Write in the server description "Uni Paderborn Mumble"or similar and confirm with "Ok".
  • Enter your IMT account password at the password prompt.

Web client - First steps


  1. Connect to Mumble.
  2. Log in with your IMT login.
  3. Now you can make a set of settings (1). You can also send messages (2) by clicking on the appropriate group.

Terms of use

  • Mumble is offered by the Computer Science Department and is operated within the University of Paderborn.
  • Further information can be found here.

Bei Fragen oder Problemen wenden Sie sich bitte telefonisch oder per E-Mail an uns:

Tel. IT: +49 (5251) 60-5544 Tel. Medien: +49 (5251) 60-2821 E-Mail:

Der Servicepoint ist aktuell im Notebook-Café zu finden

Das IMT:Notebook-Café (Raum I0.401) bietet in der vorlesungsfreien Zeit nur eingeschränkten Support und hat von Montag bis Donnerstag von 08:30 - 16:00 Uhr und Freitags von 8:30 Uhr bis 14 Uhr für Sie geöffnet geöffnet. Telefon- und E-Mailsupport erfolgt Montag bis Donnerstag von 8:30 Uhr bis 16 Uhr und Freitag von 8:30 Uhr bis 14 Uhr.

Das IMT:Servicecenter Medien auf H1 hat aktuell von Montag bis Donnerstag von 8:00 - 16:00 Uhr und am Freitag von 8:00 - 14:30 Uhr geöffnet.