- Infosim GmbH & Co. KG [Würzburg]
- Institut Brestois du Numérique et des Mathématiques
- Institut Mines-Télécom [Paris]
- Institut National de Recherche en Informatique et en Automatique
- Institut National des Sciences Appliquées
- Institut National des Sciences Appliquées - Rennes
- Institut de Recherche en Informatique et Systèmes Aléatoires
- Institute of Communication Networks
- Institute of Communication Networks [Hamburg]
- Institute of Communication Networks and Computer Engineering (IKR)
- Institute of Communication Networks and Computer Engineering [Stuttgart]
- Institute of Computer Science [Brno]
- Institute of Informatics
- Institute of Mathematics University of Zurich
- Institute of Telecommunications [Wien]
- Institute of Telematics
- Inter-University Centre for Telecommunications and Informatics [Debrecen]
- Inter-University Cooperative Research Centre for Telecommunications and Informatics
- i2Cat Foundation
- iptelorg GmbH [Berlin]