Maintenance work will be carried out overnight on the CERN telephone exchanges on 05 April between 8 p.m. and 2 a.m.

During this intervention, the fixed telephone services may be disrupted. It includes the red phones communications (the fire brigade will receive an alarm even if there is no voice) and the telephone of the elevators.
The CCC (72201) and the Fire Brigade (74444 and 74848) landline numbers will remain reachable at any time.

Mobile telephony services (GSM) will not be affected by the maintenance work.