The network project investigates the history of video-based telecommunication and remote interpreting services for sign language users in the Federal Republic of Germany based on case studies. Although deaf people are a predestined target group for videotelephony, such services have historically only been developed in the form of specialized, assistive applications. This fact raises questions about the specificity and materiality of infrastructuring assistive digitally networked media and its status between empowerment and social marginalization. The project aims to produce contributions to the infrastructuring of marginalized communication and cooperation practices, to the theory of intersensorial translation, and to a general theory of cooperative media. The project ties in with ongoing research on the history of videotelephony and video conferencing in the Collaborative Research Center 1187 Media of Cooperation at the University of Siegen.