Defines the audio/video modality and handles both audio and video calls using the AudioChannel and VideoChannel properties.
Assembly: Microsoft.Lync.Model (in Microsoft.Lync.Model.dll)
When the AVModality is connected, the default channel is audio. Starting the video channel will cause the audio channel to start if the modality is disconnected. If the AV call is rejected with a reject reason of ReplyOther, the parent Conversation object is removed and the ConversationManager.ConversationRemoved event is raised.