The University of Bern has, among other things, a room for telephone surveys in the new building on Fabrikstrasse in Bern. This room is temporarily occupied by up to 10 people who can make phone calls and conduct oral surveys at the same time. This requires optimal acoustics to ensure speech intelligibility for each individual. For this purpose we designed, planned and implemented measures. A significant improvement was made and the function of the room is thus optimally guaranteed.