Over the period 1998-today the Department of Telecommunications worked together with teams and individuals from the following academic and research institutions and companies:
- Agrokor, Zagreb
- CARNet - Croatian Academic and Research Network
- Center for Advanced Computer Studies, University of Louisiana at Lafayette, LA, USA
- Department of Production Engineering & Management, Technical University of Crete, Chania, Greece
- Department of Telecommunications, Budapest University of Technology and Economics, Hungary
- Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
- Eicon Networks - C&EE office, Šenčur, Slovenia
- Ekonomski institut, Zagreb
- Elektrotehnički fakultet, University of Osijek, Croatia
- ELKA, Zagreb
- Envox, Zagreb
- Ericsson Nikola Tesla, Zagreb
- Ericsson Computer Science Lab, Stockholm, Sweden
- Fakultet elektrotehnike, strojarstva i brodogradnje, Split
- Fakulteta za elektrotehniko, Univerza v Ljubljani, Slovenia
- Fakulteta za elektrotehniko, računalništvo in informatiko, Univerza v Mariboru, Slovenia
- Fakulteta za računalništvo in informatiko, Univerza v Ljubljani, Slovenia
- France Telecom R&D, Lannion, France
- FINA, Zagreb
- Hrvatska agencija za poštu i elektrončke komunikacije
- HEP - Hrvatska elektroprivreda
- HIT - Hrvatski institut za tehnologiju, Zagreb
- HT - Hrvatske telekomunikacije
- HŽ - Hrvatske željeznice
- Institut für Angewandte Informationsverarbeitung und Kommunikationstechnologie, Technische Universität Graz, Austria
- Institut für Nachrichtentechnik und Wellenausbreitung, Technische Universität Graz, Austria
- Institut für Breitbandkommunikation, Technische Universität Wien, Austria
- International Computer Science Institute, University of California, Berkeley, CA, USA
- IBM Hrvatska, Zagreb
- infoNET projekt, Zagreb
- Information Systems Institute, Technische Universität Wien, Wien, Austria
- KATE-KOM, Zagreb
- KES International, Brighton, UK
- M SAN Grupa, Zagreb
- Monting-I, Zagreb
- Odašiljači i veze, Zagreb
- Siemens, Zagreb
- SiliconMaster, Zagreb
- TEB inženjering, Zagreb
- The Telecommunications Research Center Vienna (FTW), Austria
- Telenor Research & Development, Kjeller, Norway
- University of Essex, Colchester, UK
- VIPnet, Zagreb
- Visage Technologies AB, Linkoeping, Sweden
- VMD promet, Zagreb