diff --git a/openvidu-android/.idea/gradle.xml b/openvidu-android/.idea/gradle.xml
index 26190961..9bba60da 100644
--- a/openvidu-android/.idea/gradle.xml
+++ b/openvidu-android/.idea/gradle.xml
@@ -4,9 +4,6 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
-        <compositeConfiguration>
-          <compositeBuild compositeDefinitionSource="SCRIPT" />
-        </compositeConfiguration>
         <option name="testRunner" value="PLATFORM" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
diff --git a/openvidu-android/.idea/misc.xml b/openvidu-android/.idea/misc.xml
index 7bfef59d..d5d35ec4 100644
--- a/openvidu-android/.idea/misc.xml
+++ b/openvidu-android/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/openvidu-android/app/build.gradle b/openvidu-android/app/build.gradle
index 48b357aa..85f6a925 100644
--- a/openvidu-android/app/build.gradle
+++ b/openvidu-android/app/build.gradle
@@ -36,7 +36,7 @@ dependencies {
     implementation 'com.jakewharton:butterknife:10.2.0'
     implementation 'com.squareup.okhttp3:okhttp:4.2.0'
     implementation 'com.neovisionaries:nv-websocket-client:2.9'
-    implementation 'org.webrtc:google-webrtc:1.0.30039'
+    implementation 'org.webrtc:google-webrtc:1.0.32006'
     annotationProcessor 'com.jakewharton:butterknife-compiler:10.2.0'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test:runner:1.2.0'
diff --git a/openvidu-android/app/src/main/AndroidManifest.xml b/openvidu-android/app/src/main/AndroidManifest.xml
index e752cb56..395b77c9 100644
--- a/openvidu-android/app/src/main/AndroidManifest.xml
+++ b/openvidu-android/app/src/main/AndroidManifest.xml
@@ -23,4 +23,6 @@
     <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
     <uses-permission android:name="android.permission.INTERNET" />
 
+    <uses-feature android:name="android.hardware.camera" />
+
 </manifest>
diff --git a/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/constants/JsonConstants.java b/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/constants/JsonConstants.java
index 6d0ac2ac..dc7aff36 100644
--- a/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/constants/JsonConstants.java
+++ b/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/constants/JsonConstants.java
@@ -4,28 +4,31 @@ public final class JsonConstants {
 
     // RPC incoming methods
     public static final String PARTICIPANT_JOINED = "participantJoined";
-    public static final String PARTICIPANT_PUBLISHED = "participantPublished";
-    public static final String PARTICIPANT_UNPUBLISHED = "participantUnpublished";
     public static final String PARTICIPANT_LEFT = "participantLeft";
+    public static final String PARTICIPANT_PUBLISHED = "participantPublished";
+    public static final String ICE_CANDIDATE = "iceCandidate";
+    public static final String PARTICIPANT_UNPUBLISHED = "participantUnpublished";
     public static final String PARTICIPANT_EVICTED = "participantEvicted";
     public static final String RECORDING_STARTED = "recordingStarted";
     public static final String RECORDING_STOPPED = "recordingStopped";
     public static final String SEND_MESSAGE = "sendMessage";
     public static final String STREAM_PROPERTY_CHANGED = "streamPropertyChanged";
     public static final String FILTER_EVENT_DISPATCHED = "filterEventDispatched";
-    public static final String ICE_CANDIDATE = "iceCandidate";
     public static final String MEDIA_ERROR = "mediaError";
 
     // RPC outgoing methods
+    public static final String PING_METHOD = "ping";
     public static final String JOINROOM_METHOD = "joinRoom";
     public static final String LEAVEROOM_METHOD = "leaveRoom";
     public static final String PUBLISHVIDEO_METHOD = "publishVideo";
     public static final String ONICECANDIDATE_METHOD = "onIceCandidate";
+    public static final String PREPARERECEIVEVIDEO_METHOD = "prepareReceiveVideoFrom";
     public static final String RECEIVEVIDEO_METHOD = "receiveVideoFrom";
     public static final String UNSUBSCRIBEFROMVIDEO_METHOD = "unsubscribeFromVideo";
     public static final String SENDMESSAGE_ROOM_METHOD = "sendMessage";
     public static final String UNPUBLISHVIDEO_METHOD = "unpublishVideo";
     public static final String STREAMPROPERTYCHANGED_METHOD = "streamPropertyChanged";
+    public static final String NETWORKQUALITYLEVELCHANGED_METHOD = "networkQualityLevelChanged";
     public static final String FORCEDISCONNECT_METHOD = "forceDisconnect";
     public static final String FORCEUNPUBLISH_METHOD = "forceUnpublish";
     public static final String APPLYFILTER_METHOD = "applyFilter";
@@ -33,7 +36,6 @@ public final class JsonConstants {
     public static final String REMOVEFILTER_METHOD = "removeFilter";
     public static final String ADDFILTEREVENTLISTENER_METHOD = "addFilterEventListener";
     public static final String REMOVEFILTEREVENTLISTENER_METHOD = "removeFilterEventListener";
-    public static final String PING_METHOD = "ping";
 
     public static final String JSON_RPCVERSION = "2.0";
 
diff --git a/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/openvidu/Session.java b/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/openvidu/Session.java
index f153f246..b1f232fb 100644
--- a/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/openvidu/Session.java
+++ b/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/openvidu/Session.java
@@ -145,13 +145,13 @@ public class Session {
         this.remoteParticipants.get(connectionId).setPeerConnection(peerConnection);
     }
 
-    public void createLocalOffer(MediaConstraints constraints) {
-        localParticipant.getPeerConnection().createOffer(new CustomSdpObserver("local offer sdp") {
+    public void createOfferForPublishing(MediaConstraints constraints) {
+        localParticipant.getPeerConnection().createOffer(new CustomSdpObserver("createOffer") {
             @Override
             public void onCreateSuccess(SessionDescription sessionDescription) {
                 super.onCreateSuccess(sessionDescription);
                 Log.i("createOffer SUCCESS", sessionDescription.toString());
-                localParticipant.getPeerConnection().setLocalDescription(new CustomSdpObserver("local set local"), sessionDescription);
+                localParticipant.getPeerConnection().setLocalDescription(new CustomSdpObserver("createOffer_setLocalDescription"), sessionDescription);
                 websocket.publishVideo(sessionDescription);
             }
 
@@ -163,6 +163,32 @@ public class Session {
         }, constraints);
     }
 
+    public void createAnswerForSubscribing(RemoteParticipant remoteParticipant, String streamId, MediaConstraints constraints) {
+        remoteParticipant.getPeerConnection().createAnswer(new CustomSdpObserver("createAnswerSubscribing") {
+            @Override
+            public void onCreateSuccess(SessionDescription sessionDescription) {
+                super.onCreateSuccess(sessionDescription);
+                Log.i("createAnswer SUCCESS", sessionDescription.toString());
+                remoteParticipant.getPeerConnection().setLocalDescription(new CustomSdpObserver("createAnswerSubscribing_setLocalDescription") {
+                    @Override
+                    public void onSetSuccess() {
+                        websocket.receiveVideoFrom(sessionDescription, remoteParticipant, streamId);
+                    }
+                    @Override
+                    public void onSetFailure(String s) {
+                        Log.e("setRemoteDescription ER", s);
+                    }
+                }, sessionDescription);
+            }
+
+            @Override
+            public void onCreateFailure(String s) {
+                Log.e("createAnswer ERROR", s);
+            }
+
+        }, constraints);
+    }
+
     public String getId() {
         return this.id;
     }
diff --git a/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/websocket/CustomWebSocket.java b/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/websocket/CustomWebSocket.java
index 80cb022a..4e15d13a 100644
--- a/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/websocket/CustomWebSocket.java
+++ b/openvidu-android/app/src/main/java/io/openvidu/openvidu_android/websocket/CustomWebSocket.java
@@ -3,6 +3,7 @@ package io.openvidu.openvidu_android.websocket;
 import android.os.AsyncTask;
 import android.os.Handler;
 import android.util.Log;
+import android.util.Pair;
 import android.widget.Toast;
 
 import com.neovisionaries.ws.client.ThreadType;
@@ -78,6 +79,7 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
     private AtomicInteger ID_JOINROOM = new AtomicInteger(-1);
     private AtomicInteger ID_LEAVEROOM = new AtomicInteger(-1);
     private AtomicInteger ID_PUBLISHVIDEO = new AtomicInteger(-1);
+    private Map<Integer, Pair<String, String>> IDS_PREPARERECEIVEVIDEO = new ConcurrentHashMap<>();
     private Map<Integer, String> IDS_RECEIVEVIDEO = new ConcurrentHashMap<>();
     private Set<Integer> IDS_ONICECANDIDATE = Collections.newSetFromMap(new ConcurrentHashMap<>());
     private Session session;
@@ -134,7 +136,7 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
             MediaConstraints sdpConstraints = new MediaConstraints();
             sdpConstraints.mandatory.add(new MediaConstraints.KeyValuePair("offerToReceiveAudio", "true"));
             sdpConstraints.mandatory.add(new MediaConstraints.KeyValuePair("offerToReceiveVideo", "true"));
-            session.createLocalOffer(sdpConstraints);
+            session.createOfferForPublishing(sdpConstraints);
 
             if (result.getJSONArray(JsonConstants.VALUE).length() > 0) {
                 // There were users already connected to the session
@@ -146,21 +148,33 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
             if (websocket.isOpen()) {
                 websocket.disconnect();
             }
-
         } else if (rpcId == this.ID_PUBLISHVIDEO.get()) {
             // Response to publishVideo
-            SessionDescription sessionDescription = new SessionDescription(SessionDescription.Type.ANSWER, result.getString("sdpAnswer"));
-            this.session.getLocalParticipant().getPeerConnection().setRemoteDescription(new CustomSdpObserver("localSetRemoteDesc"), sessionDescription);
-
+            LocalParticipant localParticipant = this.session.getLocalParticipant();
+            SessionDescription remoteSdpAnswer = new SessionDescription(SessionDescription.Type.ANSWER, result.getString("sdpAnswer"));
+            localParticipant.getPeerConnection().setRemoteDescription(new CustomSdpObserver("publishVideo_setRemoteDescription"), remoteSdpAnswer);
+        } else if (this.IDS_PREPARERECEIVEVIDEO.containsKey(rpcId)) {
+            // Response to prepareReceiveVideoFrom
+            Pair<String, String> participantAndStream = IDS_PREPARERECEIVEVIDEO.remove(rpcId);
+            RemoteParticipant remoteParticipant = session.getRemoteParticipant(participantAndStream.first);
+            String streamId = participantAndStream.second;
+            SessionDescription remoteSdpOffer = new SessionDescription(SessionDescription.Type.OFFER, result.getString("sdpOffer"));
+            remoteParticipant.getPeerConnection().setRemoteDescription(new CustomSdpObserver("prepareReceiveVideoFrom_setRemoteDescription") {
+                @Override
+                public void onSetSuccess() {
+                    subscribeAux(remoteParticipant, streamId);
+                }
+                @Override
+                public void onSetFailure(String s) {
+                    Log.i("setRemoteDescription ER", s);
+                }
+            }, remoteSdpOffer);
         } else if (this.IDS_RECEIVEVIDEO.containsKey(rpcId)) {
             // Response to receiveVideoFrom
-            SessionDescription sessionDescription = new SessionDescription(SessionDescription.Type.ANSWER, result.getString("sdpAnswer"));
-            session.getRemoteParticipant(IDS_RECEIVEVIDEO.remove(rpcId)).getPeerConnection().setRemoteDescription(new CustomSdpObserver("remoteSetRemoteDesc"), sessionDescription);
-
+            IDS_RECEIVEVIDEO.remove(rpcId);
         } else if (this.IDS_ONICECANDIDATE.contains(rpcId)) {
             // Response to onIceCandidate
             IDS_ONICECANDIDATE.remove(rpcId);
-
         } else {
             Log.e(TAG, "Unrecognized server response: " + result);
         }
@@ -194,10 +208,16 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
         this.ID_PUBLISHVIDEO.set(this.sendJson(JsonConstants.PUBLISHVIDEO_METHOD, publishVideoParams));
     }
 
+    public void prepareReceiveVideoFrom(RemoteParticipant remoteParticipant, String streamId) {
+        Map<String, String> prepareReceiveVideoFromParams = new HashMap<>();
+        prepareReceiveVideoFromParams.put("sender", streamId);
+        this.IDS_PREPARERECEIVEVIDEO.put(this.sendJson(JsonConstants.PREPARERECEIVEVIDEO_METHOD, prepareReceiveVideoFromParams), new Pair<>(remoteParticipant.getConnectionId(), streamId));
+    }
+
     public void receiveVideoFrom(SessionDescription sessionDescription, RemoteParticipant remoteParticipant, String streamId) {
         Map<String, String> receiveVideoFromParams = new HashMap<>();
-        receiveVideoFromParams.put("sdpOffer", sessionDescription.description);
         receiveVideoFromParams.put("sender", streamId);
+        receiveVideoFromParams.put("sdpAnswer", sessionDescription.description);
         this.IDS_RECEIVEVIDEO.put(this.sendJson(JsonConstants.RECEIVEVIDEO_METHOD, receiveVideoFromParams), remoteParticipant.getConnectionId());
     }
 
@@ -254,7 +274,7 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
             jsonObject.put("id", id);
             jsonObject.put("params", paramsJson);
         } catch (JSONException e) {
-            Log.i(TAG, "JSONException raised on sendJson", e);
+            Log.e(TAG, "JSONException raised on sendJson", e);
             return -1;
         }
         this.websocket.sendText(jsonObject.toString());
@@ -272,7 +292,7 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
                 for (int j = 0; j < streams.length(); j++) {
                     JSONObject stream = streams.getJSONObject(0);
                     String streamId = stream.getString("id");
-                    this.subscribeAux(remoteParticipant, streamId);
+                    this.prepareSubscriptionAux(remoteParticipant, streamId);
                 }
             } catch (Exception e) {
                 //Sometimes when we enter in room the other participants have no stream
@@ -314,7 +334,7 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
         String remoteParticipantId = params.getString(JsonConstants.ID);
         final RemoteParticipant remoteParticipant = this.session.getRemoteParticipant(remoteParticipantId);
         final String streamId = params.getJSONArray("streams").getJSONObject(0).getString("id");
-        this.subscribeAux(remoteParticipant, streamId);
+        this.prepareSubscriptionAux(remoteParticipant, streamId);
     }
 
     private void participantLeftEvent(JSONObject params) throws JSONException {
@@ -346,24 +366,15 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
         return remoteParticipant;
     }
 
+    private void prepareSubscriptionAux(RemoteParticipant remoteParticipant, String streamId) {
+        prepareReceiveVideoFrom(remoteParticipant, streamId);
+    }
+
     private void subscribeAux(RemoteParticipant remoteParticipant, String streamId) {
         MediaConstraints sdpConstraints = new MediaConstraints();
         sdpConstraints.mandatory.add(new MediaConstraints.KeyValuePair("offerToReceiveAudio", "true"));
         sdpConstraints.mandatory.add(new MediaConstraints.KeyValuePair("offerToReceiveVideo", "true"));
-
-        remoteParticipant.getPeerConnection().createOffer(new CustomSdpObserver("remote offer sdp") {
-            @Override
-            public void onCreateSuccess(SessionDescription sessionDescription) {
-                super.onCreateSuccess(sessionDescription);
-                remoteParticipant.getPeerConnection().setLocalDescription(new CustomSdpObserver("remoteSetLocalDesc"), sessionDescription);
-                receiveVideoFrom(sessionDescription, remoteParticipant, streamId);
-            }
-
-            @Override
-            public void onCreateFailure(String s) {
-                Log.e("createOffer error", s);
-            }
-        }, sdpConstraints);
+        this.session.createAnswerForSubscribing(remoteParticipant, streamId, sdpConstraints);
     }
 
     public void setWebsocketCancelled(boolean websocketCancelled) {
@@ -478,43 +489,43 @@ public class CustomWebSocket extends AsyncTask<SessionActivity, Void, Void> impl
 
     @Override
     public void onError(WebSocket websocket, WebSocketException cause) throws Exception {
-        Log.i(TAG, "Error!");
+        Log.e(TAG, "Error!");
     }
 
     @Override
     public void onFrameError(WebSocket websocket, WebSocketException cause, WebSocketFrame
             frame) throws Exception {
-        Log.i(TAG, "Frame error!");
+        Log.e(TAG, "Frame error!");
     }
 
     @Override
     public void onMessageError(WebSocket websocket, WebSocketException
             cause, List<WebSocketFrame> frames) throws Exception {
-        Log.i(TAG, "Message error! " + cause);
+        Log.e(TAG, "Message error! " + cause);
     }
 
     @Override
     public void onMessageDecompressionError(WebSocket websocket, WebSocketException cause,
                                             byte[] compressed) throws Exception {
-        Log.i(TAG, "Message decompression error!");
+        Log.e(TAG, "Message decompression error!");
     }
 
     @Override
     public void onTextMessageError(WebSocket websocket, WebSocketException cause, byte[] data) throws
             Exception {
-        Log.i(TAG, "Text message error! " + cause);
+        Log.e(TAG, "Text message error! " + cause);
     }
 
     @Override
     public void onSendError(WebSocket websocket, WebSocketException cause, WebSocketFrame frame) throws
             Exception {
-        Log.i(TAG, "Send error! " + cause);
+        Log.e(TAG, "Send error! " + cause);
     }
 
     @Override
     public void onUnexpectedError(WebSocket websocket, WebSocketException cause) throws
             Exception {
-        Log.i(TAG, "Unexpected error! " + cause);
+        Log.e(TAG, "Unexpected error! " + cause);
     }
 
     @Override
diff --git a/openvidu-android/build.gradle b/openvidu-android/build.gradle
index fb516be2..801467dd 100644
--- a/openvidu-android/build.gradle
+++ b/openvidu-android/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.2'
+        classpath 'com.android.tools.build:gradle:4.1.3'
         
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/openvidu-android/gradle/wrapper/gradle-wrapper.properties b/openvidu-android/gradle/wrapper/gradle-wrapper.properties
index 9ac8b710..d7c952e1 100644
--- a/openvidu-android/gradle/wrapper/gradle-wrapper.properties
+++ b/openvidu-android/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Sep 10 10:08:16 CEST 2019
+#Thu Mar 25 18:51:34 CET 2021
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip