diff --git a/config.js b/config.js
index db9c3b195..1074b03c7 100644
--- a/config.js
+++ b/config.js
@@ -15,5 +15,6 @@ var config = {
     enableRtpStats: true, // Enables RTP stats processing
     openSctp: true, // Toggle to enable/disable SCTP channels
 //    channelLastN: -1, // The default value of the channel attribute last-n.
+//    useRtcpMux: true,
     enableRecording: false
 };
diff --git a/libs/colibri/colibri.focus.js b/libs/colibri/colibri.focus.js
index 20a55a53e..62c5b4bb9 100644
--- a/libs/colibri/colibri.focus.js
+++ b/libs/colibri/colibri.focus.js
@@ -303,6 +303,9 @@ ColibriFocus.prototype._makeConference = function () {
 
             elem.c(elemName, elemAttrs);
             elem.attrs({ endpoint: peer.substr(1 + peer.lastIndexOf('/')) });
+            if ('channel' === elemName && config.useRtcpMux) {
+                elem.c('rtcp-mux').up();
+            }
             elem.up(); // end of channel/sctpconnection
         }
         elem.up(); // end of content
@@ -407,6 +410,7 @@ ColibriFocus.prototype.createdConference = function (result) {
         'a=rtpmap:13 CN/8000\r\n' +
         'a=rtpmap:126 telephone-event/8000\r\n' +
         'a=maxptime:60\r\n' +
+        (config.useRtcpMux ? 'a=rtcp-mux\r\n' : '') +
         /* Video */
         'm=video 1 RTP/SAVPF 100 116 117\r\n' +
         'c=IN IP4 0.0.0.0\r\n' +
@@ -421,6 +425,7 @@ ColibriFocus.prototype.createdConference = function (result) {
         'a=rtcp-fb:100 goog-remb\r\n' +
         'a=rtpmap:116 red/90000\r\n' +
         'a=rtpmap:117 ulpfec/90000\r\n' +
+        (config.useRtcpMux ? 'a=rtcp-mux\r\n' : '') +
         /* Data SCTP */
         (config.openSctp ?
             'm=application 1 DTLS/SCTP 5000\r\n' +
@@ -617,7 +622,9 @@ ColibriFocus.prototype.initiate = function (peer, isInitiator) {
         sdp.removeSessionLines('a=group:');
         sdp.removeSessionLines('a=msid-semantic:'); // FIXME: not mapped over jingle anyway...
         for (var i = 0; i < sdp.media.length; i++) {
-            sdp.removeMediaLines(i, 'a=rtcp-mux');
+            if (!config.useRtcpMux){
+                sdp.removeMediaLines(i, 'a=rtcp-mux');
+            }
             sdp.removeMediaLines(i, 'a=ssrc:');
             sdp.removeMediaLines(i, 'a=crypto:');
             sdp.removeMediaLines(i, 'a=candidate:');
@@ -774,6 +781,9 @@ ColibriFocus.prototype.addNewParticipant = function (peer) {
 
         elem.c('content', { name: name });
         elem.c(elemName, elemAttrs);
+        if ('channel' === elemName && config.useRtcpMux) {
+            elem.c('rtcp-mux').up();
+        }
         elem.up(); // end of channel/sctpconnection
         elem.up(); // end of content
     });
@@ -821,6 +831,9 @@ ColibriFocus.prototype.updateChannel = function (remoteSDP, participant) {
                 endpoint: $(this.channels[participant][channel]).attr('endpoint'),
                 expire: self.channelExpire
             });
+            if (config.useRtcpMux) {
+                change.c('rtcp-mux').up();
+            }
 
             var rtpmap = SDPUtil.find_lines(remoteSDP.media[channel], 'a=rtpmap:');
             rtpmap.forEach(function (val) {
@@ -1031,6 +1044,10 @@ ColibriFocus.prototype.addIceCandidate = function (session, elem) {
                 endpoint: $(self.channels[participant][channel]).attr('endpoint'),
                 expire: self.channelExpire
             });
+
+            if (config.useRtcpMux) {
+                change.c('rtcp-mux').up();
+            }
         }
         else
         {
@@ -1114,6 +1131,10 @@ ColibriFocus.prototype.sendIceCandidates = function (candidates) {
                     endpoint: $(this.mychannel[cands[0].sdpMLineIndex]).attr('endpoint'),
                     expire: self.channelExpire
                 });
+                if (config.useRtcpMux) {
+                    mycands.c('rtcp-mux').up();
+                }
+
             }
             else
             {
diff --git a/libs/strophe/strophe.jingle.adapter.js b/libs/strophe/strophe.jingle.adapter.js
index 05c69bcd6..30eaff65e 100644
--- a/libs/strophe/strophe.jingle.adapter.js
+++ b/libs/strophe/strophe.jingle.adapter.js
@@ -513,7 +513,7 @@ function getUserMediaWithConstraints(um, success_callback, failure_callback, res
         constraints.video = { mandatory: {}, optional: [] };// same behaviour as true
     }
     if (um.indexOf('audio') >= 0) {
-        constraints.audio = {};// same behaviour as true
+        constraints.audio = { mandatory: {}, optional: []};// same behaviour as true
     }
     if (um.indexOf('screen') >= 0) {
         constraints.video = {
@@ -541,6 +541,29 @@ function getUserMediaWithConstraints(um, success_callback, failure_callback, res
         }
     }
 
+    if (constraints.audio) {
+        // if it is good enough for hangouts...
+        constraints.audio.optional.push(
+            {googEchoCancellation: true},
+            {googAutoGainControl: true},
+            {googNoiseSupression: true},
+            {googHighpassFilter: true},
+            {googNoisesuppression2: true},
+            {googEchoCancellation2: true},
+            {googAutoGainControl2: true}
+        );
+    }
+    if (constraints.video) {
+        constraints.video.optional.push(
+            {googNoiseReduction: true}
+        );
+        if (um.indexOf('video') >= 0) {
+            constraints.video.optional.push(
+                {googLeakyBucket: true}
+            );
+        }
+    }
+
     // Check if we are running on Android device
     var isAndroid = navigator.userAgent.indexOf('Android') != -1;
 
@@ -596,12 +619,12 @@ function getUserMediaWithConstraints(um, success_callback, failure_callback, res
     }
 
     if (bandwidth) { // doesn't work currently, see webrtc issue 1846
-        if (!constraints.video) constraints.video = {mandatory: {}};//same behaviour as true
-        constraints.video.optional = [{bandwidth: bandwidth}];
+        if (!constraints.video) constraints.video = {mandatory: {}, optional: []};//same behaviour as true
+        constraints.video.optional.push({bandwidth: bandwidth});
     }
     if (fps) { // for some cameras it might be necessary to request 30fps
         // so they choose 30fps mjpg over 10fps yuy2
-        if (!constraints.video) constraints.video = {mandatory: {}};// same behaviour as tru;
+        if (!constraints.video) constraints.video = {mandatory: {}, optional: []};// same behaviour as true;
         constraints.video.mandatory.minFrameRate = fps;
     }