This Recommendation describes the functionality of a decomposed multipoint control unit, in particular the interface between a media controller and media processor which is based on ITU‑T Rec. H.248. This Recommendation contains guidelines for the use of a decomposed gateway that may support audio, video and data conferencing. This Recommendation contains packages for floor control, volume control, video windows, audio and video mixing for point-to-point, multi-cast and hybrid conferencing scenarios.