update confOrder with voiceActivity

Change-Id: I75a733a98fa33dbd8cc09f8a4816eb3b3d501f7a

developer/conference-protocol.md

@@ -79,8 +79,7 @@ Possible keys are:
 + audioModeratorMuted = if the audio is muted by moderators
 + isModerator = if it's a moderator
 + handRaised = if the hand is raised
-
-In the future, `isTalking` will probably be added
++ voiceActivity = if the stream has voice activity
 
 ### New API
 
@@ -137,6 +136,7 @@ For now, there is no action supported, however, in the future `moderator: true/f
 + `muteAudio` only doable by moderators to mute the audio of a participant
 + `muteVideo` not supported yet.
 + `active` to mark the media as active.
++ `voiceActivity` to indiciate a media stream's voice activity status (only relevant for audio)
 
 ### Example
 
@@ -145,7 +145,7 @@ So, the `application/confOrder+json` will contains:
 ```json
 {
     "989587609427420" : {
-        "moderator": true/false
+        "moderator": true/false,
         "devices": {
             "40940943604396R64363": {
                 "hangup": true,
@@ -154,12 +154,13 @@ So, the `application/confOrder+json` will contains:
                     "3532532662432" : {
                         "muteAudio": true/false,
                         "muteVideo": true/false,
-                        "active": true/false
-                    }
+                        "active": true/false,
+                        "voiceActivity": true/false
                     }
                 }
             }
         }
+    },
     "layout": 0/1/2,
 }
 ```