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In mod_conference 1.6.x, all conference users could get the audio floor regardless of the kind of video layer they were placed in. In 1.8.x, the concept of a 'dedicated video layer' was introduced, such that video layout slots with a reservation ID or a role ID are marked with the 'MFLAG_DED_VID_LAYER' member flag when a member is in the slot, and such marked layers are prevented from becoming the conference audio/video floor holder. This makes sense for the video floor in all circumstances, and the audio floor in most circumstances. However, there are some circumstances where allowing users in these dedicated video layers to become the conference audio floor holder is preferred, such as when all slots in the layout have reservation IDs, and the audio floor events are used to manage users in those slots manually. This adds a conference profile flag, 'ded-vid-layer-audio-floor, which, when enabled, allows conference members in dedicated video layers to become the conference audio floor holder.