diff --git a/libLinphoneAndroidSdk.gradle b/libLinphoneAndroidSdk.gradle
index ef88d09cc..79a59d80d 100644
--- a/libLinphoneAndroidSdk.gradle
+++ b/libLinphoneAndroidSdk.gradle
@@ -86,6 +86,7 @@ task(releaseJavadoc, type: Javadoc, dependsOn: "assembleRelease") {
     classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
     classpath += files(android.libraryVariants.release.javaCompile.classpath.files)
     classpath += configurations.javadocDeps
+    options.encoding = 'UTF-8'
 }
 
 task sourcesJar(type: Jar) {
diff --git a/src/android/org/linphone/LinphoneManager.java b/src/android/org/linphone/LinphoneManager.java
index aa3f92449..2d418746f 100644
--- a/src/android/org/linphone/LinphoneManager.java
+++ b/src/android/org/linphone/LinphoneManager.java
@@ -1328,7 +1328,7 @@ public class LinphoneManager implements CoreListener, SensorEventListener, Accou
 
 	private void requestAudioFocus(int stream){
 		if (!mAudioFocused){
-			int res = mAudioManager.requestAudioFocus(null, stream, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT );
+			int res = mAudioManager.requestAudioFocus(null, stream, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE );
 			Log.d("Audio focus requested: " + (res == AudioManager.AUDIOFOCUS_REQUEST_GRANTED ? "Granted" : "Denied"));
 			if (res == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) mAudioFocused=true;
 		}
diff --git a/submodules/bctoolbox b/submodules/bctoolbox
index 01ec217fb..25e640640 160000
--- a/submodules/bctoolbox
+++ b/submodules/bctoolbox
@@ -1 +1 @@
-Subproject commit 01ec217fbf84c7488afbe36913d4fde5d783b10a
+Subproject commit 25e640640000e2ea691c4eb6137e8edebf6b3a52
diff --git a/submodules/belle-sip b/submodules/belle-sip
index 3da1dd118..dd5de8022 160000
--- a/submodules/belle-sip
+++ b/submodules/belle-sip
@@ -1 +1 @@
-Subproject commit 3da1dd118e466c27ffade5af16528dfca145031b
+Subproject commit dd5de8022ff5a1ef4ea2d4b2a5761658f1c6010c
diff --git a/submodules/mediastreamer2 b/submodules/mediastreamer2
index c72fb8e79..e20c2ed9a 160000
--- a/submodules/mediastreamer2
+++ b/submodules/mediastreamer2
@@ -1 +1 @@
-Subproject commit c72fb8e7994f1ccb61f89d77fdc9425df53a4033
+Subproject commit e20c2ed9a7397e5d6cc9ed4cbf3539761ae35111