The active (dominant) speaker in this conversation
Number of participants' video streams that can be displayed in a multiparty call simultaneously if the platform supports multi-video. This is the upper bound defined by the platform.
video mode supported by the platform
Video component of a conversation.
ConversationService::start either adds video to the exisitng audio call or starts a new outbound audio/video call, i.e. starts the AudioService as well. Accept and Reject handle the incoming video invitation. Stop removes the video portion of the AV call. On Skype it will stop the ScreenSharing service as well.