+:role - a one-word description of the "type" of media to be played
+ on the server. It can be one of:
+ "video" - for movie/video streams
+ "music" - for music streams (like mp3's, oga's etc)
+ "game" - for audio from games
+ "event" - for event sounds (this is the default)
+ "phone" - for VoIP and Instant Messaging audio
+ "animation" - for animations
+ "production" - for audio production applications
+ "a11y" - for accessibility applications