Considers the security aspects of the terminal devices and switching units (middleware) of VoIP, which correspond in function to the telecommunication systems of NET.4.1. In Edition 2023 the Baustein carries 16 requirement numbers, 13 of them live: 4 Basis requirements (B, MUSS, to be fulfilled first and without exception), 6 Standard requirements (S, SOLLTE) and 3 requirements for elevated protection needs (H), with 3 numbers withdrawn (ENTFALLEN) and kept for stable numbering. It is applied to a network in modelling order R2. The requirements property on this node lists every requirement by number, title, level and responsible role, so a requirement is cited as NET.4.2.A<n>.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.