The 41st PosTel Symposium on new technologies in postal traffic is taking place at the Faculty of Transport and Traffic Engineering of the Belgrade University on 28 and 29 November 2023. The presentation of our company was made by Prof. dr Slaven Tica, the managing director. The CIP team of our telecommunications engineers made presentations of two papers in the field of electronic communication networks in function of road tunnel safety and on the topic of designing the information system for the Serbian railways infrastructure on the Belgrade Centre – Stara Pazova – Novi Sad railway section.