This document specifies common session layer services and requirements to provide independence between unified diagnostic services (ISO 14229‑1) and all transport protocols and network layer services (e.g. ISO 13400‑2 DoIP, ISO 15765‑2 DoCAN, ISO 10681‑2 communication on FlexRay, ISO 14230‑2 DoK-Line, and ISO 20794‑3 CXPI).

This document specifies a common service primitive interface between OSI layer 5 (session) and layer 4 (transport) via so-called service request/indication/confirmation primitives.