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Reporting a Telephone Fault (Cisco)

Reporting a Telephone Fault (Cisco)


You can report Cisco phone malfunctions as follows:


In order to be able to correct the fault as quickly as possible, we require the following information:

  • Building no. (if not known the address):
  • Room no.(optionally floor/hallway):
  • if known Institute/organizational unit:
  • Name of the reporting party:
  • Type of phone: Desk phone/conference room phone/hallway phone/WLAN phone
  • Working callback number:
  • Brief error description (defect of the telephone):
  • Date/Time:
  • MAC address of the phone (not the WLAN MAC) or serial number
  • if ascertainable switch or socket number                   


On-call service

Please inform the IT-ServiceDesk in the time period from 7:30 a.m. - 6:00 p.m. under the phone number: 0241 80-24680.

After 6:00 p.m., in urgent cases, the on-call telephone service can be reached exclusively at the times listed below via the service number 21112 from a telephone in the university telephone system.


Day of week                           Begin              End (potentially next day)

Monday-Thursday                 06:00   PM      07:30 a.m.

Friday                                      06:00   PM      00:00

Saturday                                 00:00              00:00

Sunday                                   00:00              07:30 a.m. (Monday)

last changed on 09/08/2023

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