Article 7 imposes phased interoperability on Number-Independent Interpersonal Communication Services (N-IICS) designated as CPS: (1) free-of-charge interoperability access on request to any other N-IICS, with messaging functionality (text, image, audio, video); (2) phased: messages + files + voice/video calls; (3) preservation of end-to-end encryption equivalent to the level offered between users of the gatekeeper's own service; (4) basic functionality offered first, with group + voice/video added on the 2-year and 4-year timelines respectively; (5) technical specifications published and updated.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.