Recommendation ITU-T H.248.19 describes the functionality of a decomposed multipoint control unit, in particular the interface between a media controller and media processor which is based on Recommendation ITU‑T 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.
Amendment 1 defines two new packages – the Text Overlay Package and the Border and Background Package, which together with the Video Window Package may be used to provide additional conference control capabilities.
Amendment 2 provides enhancements to H.248.19 Amendment 1 for greater floor control of conferences. It enables floor control to be determined on a stream basis through the use of the "Controlled by Chair" property. It enables a media gateway controller to set a floor control policy through the use of the "Floor Control Policy" package and to request to be notified when a change of floor status occurs through the use of the "Floor Status Change Handling" package.