International scientific conference PosTel 2019 is held under the organization of the University of Belgrade, Faculty of Transport and Traffic Engineering. Two papers by members of the Department are presented at the conference, entitled Analysis of the Network Traffic Features Generated by IoT Devices (authors I. Cvitić, P. Zorić, T. M. Kuljanić, M. Musa) and WhatsApp, Viber & Messenger: Comparative Analysis of Data Traffic Amount Generated by a Video File Exchange (authors S. Husnjak, I. Forenbacher, I. Jovović, M. Periša).