ISO/IEC 20382-2:2017 specifies the functional components of face-to-face speech translation designed to interoperate among multiple translation systems with different languages. It also specifies the speech translation features, general requirements and functionality, thus providing a framework to support a convenient speech translation service in face-to-face situations. This document is applicable to speech translation devices, servers and communication protocols among speech translation servers and clients in a high-level approach. ISO/IEC 20382-2:2017 also defines various system architectures in different environments. ISO/IEC 20382-2:2017 is not applicable to defining speech recognition engines, language translation engines and speech synthesis engines.