diff --git a/app/lib/Client.js b/app/lib/Client.js
index 5f1c056..d9d8453 100644
--- a/app/lib/Client.js
+++ b/app/lib/Client.js
@@ -28,6 +28,9 @@ export default class Client extends events.EventEmitter
 		super();
 		this.setMaxListeners(Infinity);
 
+		// TODO: TMP
+		global.CLIENT = this;
+
 		let url = urlFactory.getProtooUrl(peerId, roomId);
 		let transport = new protooClient.WebSocketTransport(url);
 
@@ -708,6 +711,16 @@ export default class Client extends events.EventEmitter
 				break;
 			}
 
+			case 'activespeaker':
+			{
+				let data = request.data;
+
+				this.emit('activespeaker', data.peer, data.level);
+				accept();
+
+				break;
+			}
+
 			default:
 			{
 				logger.error('unknown method');
@@ -776,7 +789,6 @@ export default class Client extends events.EventEmitter
 		this._peerconnection = new RTCPeerConnection({ iceServers: [] });
 
 		// TODO: TMP
-		global.CLIENT = this;
 		global.PC = this._peerconnection;
 
 		if (this._localStream)
diff --git a/app/lib/components/LocalVideo.jsx b/app/lib/components/LocalVideo.jsx
index 9370a40..9b23d23 100644
--- a/app/lib/components/LocalVideo.jsx
+++ b/app/lib/components/LocalVideo.jsx
@@ -5,6 +5,7 @@ import IconButton from 'material-ui/IconButton/IconButton';
 import MicOffIcon from 'material-ui/svg-icons/av/mic-off';
 import VideoCamOffIcon from 'material-ui/svg-icons/av/videocam-off';
 import ChangeVideoCamIcon from 'material-ui/svg-icons/av/repeat';
+import classnames from 'classnames';
 import Video from './Video';
 import Logger from '../Logger';
 
@@ -30,7 +31,12 @@ export default class LocalVideo extends React.Component
 		let state = this.state;
 
 		return (
-			<div data-component='LocalVideo' className={`state-${props.connectionState}`}>
+			<div
+				data-component='LocalVideo'
+				className={classnames(`state-${props.connectionState}`, {
+					'active-speaker' : props.isActiveSpeaker
+				})}
+			>
 				{props.stream ?
 					<Video
 						stream={props.stream}
@@ -141,6 +147,7 @@ LocalVideo.propTypes =
 	multipleWebcams    : React.PropTypes.bool.isRequired,
 	webcamType         : React.PropTypes.string,
 	connectionState    : React.PropTypes.string,
+	isActiveSpeaker    : React.PropTypes.bool.isRequired,
 	onMicMute          : React.PropTypes.func.isRequired,
 	onWebcamToggle     : React.PropTypes.func.isRequired,
 	onWebcamChange     : React.PropTypes.func.isRequired,
diff --git a/app/lib/components/RemoteVideo.jsx b/app/lib/components/RemoteVideo.jsx
index 8939616..fa7d561 100644
--- a/app/lib/components/RemoteVideo.jsx
+++ b/app/lib/components/RemoteVideo.jsx
@@ -33,7 +33,10 @@ export default class RemoteVideo extends React.Component
 		return (
 			<div
 				data-component='RemoteVideo'
-				className={classnames({ fullsize: !!props.fullsize })}
+				className={classnames({
+					fullsize         : !!props.fullsize,
+					'active-speaker' : props.isActiveSpeaker
+				})}
 			>
 				<Video
 					stream={props.stream}
@@ -93,9 +96,10 @@ export default class RemoteVideo extends React.Component
 
 RemoteVideo.propTypes =
 {
-	peer           : React.PropTypes.object.isRequired,
-	stream         : React.PropTypes.object.isRequired,
-	fullsize       : React.PropTypes.bool,
-	onDisableVideo : React.PropTypes.func.isRequired,
-	onEnableVideo  : React.PropTypes.func.isRequired
+	peer            : React.PropTypes.object.isRequired,
+	stream          : React.PropTypes.object.isRequired,
+	fullsize        : React.PropTypes.bool,
+	isActiveSpeaker : React.PropTypes.bool.isRequired,
+	onDisableVideo  : React.PropTypes.func.isRequired,
+	onEnableVideo   : React.PropTypes.func.isRequired
 };
diff --git a/app/lib/components/Room.jsx b/app/lib/components/Room.jsx
index 0e4d4a8..89b2735 100644
--- a/app/lib/components/Room.jsx
+++ b/app/lib/components/Room.jsx
@@ -29,7 +29,8 @@ export default class Room extends React.Component
 			connectionState      : null,
 			remoteStreams        : {},
 			showStats            : false,
-			stats                : null
+			stats                : null,
+			activeSpeakerId      : null
 		};
 
 		// Mounted flag
@@ -89,6 +90,7 @@ export default class Room extends React.Component
 											peer={peer}
 											stream={stream}
 											fullsize={numPeers === 1}
+											isActiveSpeaker={peer.id === state.activeSpeakerId}
 											onDisableVideo={this.handleDisableRemoteVideo.bind(this)}
 											onEnableVideo={this.handleEnableRemoteVideo.bind(this)}
 										/>
@@ -107,6 +109,7 @@ export default class Room extends React.Component
 								multipleWebcams={state.multipleWebcams}
 								webcamType={state.webcamType}
 								connectionState={state.connectionState}
+								isActiveSpeaker={props.peerId === state.activeSpeakerId}
 								onMicMute={this.handleLocalMute.bind(this)}
 								onWebcamToggle={this.handleLocalWebcamToggle.bind(this)}
 								onWebcamChange={this.handleLocalWebcamChange.bind(this)}
@@ -296,8 +299,12 @@ export default class Room extends React.Component
 
 		this._client.on('close', (error) =>
 		{
-			// Clear remote streams (for reconnections).
-			this.setState({ remoteStreams: {} });
+			// Clear remote streams (for reconnections) and more stuff.
+			this.setState(
+				{
+					remoteStreams   : {},
+					activeSpeakerId : null
+				});
 
 			if (error)
 			{
@@ -431,6 +438,14 @@ export default class Room extends React.Component
 			// https://bugzilla.mozilla.org/show_bug.cgi?id=1347578
 			this.forceUpdate();
 		});
+
+		this._client.on('activespeaker', (peer) =>
+		{
+			this.setState(
+				{
+					activeSpeakerId : (peer ? peer.id : null)
+				});
+		});
 	}
 
 	_startStats()
diff --git a/app/lib/components/Video.jsx b/app/lib/components/Video.jsx
index 965a9ba..614fd8d 100644
--- a/app/lib/components/Video.jsx
+++ b/app/lib/components/Video.jsx
@@ -90,12 +90,12 @@ export default class Video extends React.Component
 
 			this._hark.on('speaking', () =>
 			{
-				logger.debug('hark "speaking" event');
+				// logger.debug('hark "speaking" event');
 			});
 
 			this._hark.on('stopped_speaking', () =>
 			{
-				logger.debug('hark "stopped_speaking" event');
+				// logger.debug('hark "stopped_speaking" event');
 
 				this.setState({ volume: 0 });
 			});
diff --git a/app/stylus/components/LocalVideo.styl b/app/stylus/components/LocalVideo.styl
index f63fc46..5d5cfcf 100644
--- a/app/stylus/components/LocalVideo.styl
+++ b/app/stylus/components/LocalVideo.styl
@@ -21,7 +21,7 @@
 	}
 
 	&.state-checking {
-		animation: LocalVideo-state-checking .75s infinite linear;
+		animation: LocalVideo-state-checking .5s infinite linear;
 	}
 
 	&.state-connected,
@@ -35,6 +35,10 @@
 		border-color: rgba(#ff2000, 0.75);
 	}
 
+	&.active-speaker {
+		border-color: rgba(#fff, 0.9);
+	}
+
 	> .controls {
 		pointer-events: none;
 		position: absolute;
diff --git a/app/stylus/components/RemoteVideo.styl b/app/stylus/components/RemoteVideo.styl
index 4ab512f..025e5f3 100644
--- a/app/stylus/components/RemoteVideo.styl
+++ b/app/stylus/components/RemoteVideo.styl
@@ -47,6 +47,10 @@
 		}
 	}
 
+	&.active-speaker {
+		border-color: rgba(#fff, 0.9);
+	}
+
 	> .controls {
 		pointer-events: none;
 		position: absolute;
diff --git a/app/stylus/components/Video.styl b/app/stylus/components/Video.styl
index 91cfbda..ed94fe5 100644
--- a/app/stylus/components/Video.styl
+++ b/app/stylus/components/Video.styl
@@ -34,7 +34,7 @@
 		z-index: 5;
 		top: 0
 		bottom: 0;
-		right: 0;
+		right: 2px;
 		width: 10px;
 		display: flex;
 		flex-direction: column;
diff --git a/server/lib/Room.js b/server/lib/Room.js
index a363ebe..c99f320 100644
--- a/server/lib/Room.js
+++ b/server/lib/Room.js
@@ -9,6 +9,7 @@ const config = require('../config');
 const MAX_BITRATE = config.mediasoup.maxBitrate || 3000000;
 const MIN_BITRATE = Math.min(50000 || MAX_BITRATE);
 const BITRATE_FACTOR = 0.75;
+const MIN_AUDIO_LEVEL = -50;
 
 class Room extends EventEmitter
 {
@@ -30,6 +31,8 @@ class Room extends EventEmitter
 		this._pendingProtooPeers = [];
 		// Current max bitrate for all the participants.
 		this._maxBitrate = MAX_BITRATE;
+		// Current active speaker mediasoup Peer.
+		this._activeSpeaker = null;
 
 		// Create a mediasoup room.
 		mediaServer.createRoom(
@@ -53,6 +56,60 @@ class Room extends EventEmitter
 							this._updateMaxBitrate();
 						});
 					});
+
+					this._mediaRoom.on('audiolevels', (entries) =>
+					{
+						logger.debug('room "audiolevels" event');
+
+						for (let entry of entries)
+						{
+							logger.debug('- [peer name:%s, rtpReceiver.id:%s, audio level:%s]',
+								entry.peer.name, entry.rtpReceiver.id, entry.audioLevel);
+						}
+
+						let activeSpeaker;
+						let activeLevel;
+
+						if (entries.length > 0)
+						{
+							activeSpeaker = entries[0].peer;
+							activeLevel = entries[0].audioLevel;
+
+							if (activeLevel < MIN_AUDIO_LEVEL)
+							{
+								activeSpeaker = null;
+								activeLevel = undefined;
+							}
+						}
+						else
+						{
+							activeSpeaker = null;
+						}
+
+						if (this._activeSpeaker !== activeSpeaker)
+						{
+							let data = {};
+
+							if (activeSpeaker)
+							{
+								logger.debug('active speaker [peer:"%s", volume:%s]',
+									activeSpeaker.name, activeLevel);
+
+								data.peer = { id: activeSpeaker.name };
+								data.level = activeLevel;
+							}
+							else
+							{
+								logger.debug('no current speaker');
+
+								data.peer = null;
+							}
+
+							this._protooRoom.spread('activespeaker', data);
+						}
+
+						this._activeSpeaker = activeSpeaker;
+					});
 				});
 
 				// Run all the pending join requests.