- start recording of voice when the first person joins the voice conference

...main/java/org/bigbluebutton/webconference/voice/Room.java

...webconference/voice/freeswitch/FreeswitchApplication.java

...g/bigbluebutton/webconference/voice/internal/RoomImp.java

...gbluebutton/webconference/voice/internal/RoomManager.java