On November 4, 2025, between 6:00 a.m. and 8:00 a.m., the University of Ulm's
office phones will be switched from the old ISDN technology to new VoIP-based
SIP technology. During this time, there will be restrictions on making
external calls and on external accessibility by phone.
Internal telephony will not be affected during this period. In case of
emergency, please dial the emergency numbers 110 and 112 using a mobile phone.
MS