diff --git a/coreapi/linphonecore_jni.cc b/coreapi/linphonecore_jni.cc
index 1b86f235c..352258055 100644
--- a/coreapi/linphonecore_jni.cc
+++ b/coreapi/linphonecore_jni.cc
@@ -1282,7 +1282,7 @@ public:
 		LinphoneJavaBindings *ljb = (LinphoneJavaBindings *)linphone_core_get_user_data(lc);
 		LinphoneCoreVTable *table = linphone_core_get_current_vtable(lc);
 		LinphoneCoreData* lcData = (LinphoneCoreData*)linphone_core_v_table_get_user_data(table);
-		statsobj = env->NewObject(ljb->callStatsClass, ljb->callStatsId, (jlong)call, (jlong)stats);
+		statsobj = env->NewObject(ljb->callStatsClass, ljb->callStatsId, (jlong)stats);
 		callobj = getCall(env, call);
 		env->CallVoidMethod(lcData->listener, ljb->callStatsUpdatedId, lcData->core, callobj, statsobj);
 		handle_possible_java_exception(env, lcData->listener);
@@ -3478,6 +3478,14 @@ JNIEXPORT jobject JNICALL Java_org_linphone_core_LinphoneCallImpl_getStats(JNIEn
 	return stats ? env->NewObject(ljb->callStatsClass, ljb->callStatsId, (jlong)stats) : NULL;
 }
 
+JNIEXPORT jobject JNICALL Java_org_linphone_core_LinphoneCallImpl_getCore(JNIEnv*  env
+																		,jobject  thiz
+																		,jlong ptr) {
+	LinphoneCall *call=(LinphoneCall*)ptr;
+	LinphoneJavaBindings *ljb = (LinphoneJavaBindings *) linphone_core_get_user_data(linphone_call_get_core(call));
+	return ljb->getCore();
+}
+
 extern "C" jlong Java_org_linphone_core_LinphoneCallImpl_getCallLog(	JNIEnv*  env
 																		,jobject  thiz
 																		,jlong ptr) {
@@ -5059,7 +5067,7 @@ extern "C" jlong Java_org_linphone_core_LinphoneCallImpl_getRemoteParams(JNIEnv
 }
 
 extern "C" jlong Java_org_linphone_core_LinphoneCallImpl_getCurrentParams(JNIEnv *env, jobject thiz, jlong lc){
-	return (jlong) linphone_call_params_copy(linphone_call_get_current_params((LinphoneCall*)lc));
+	return (jlong) linphone_call_params_ref((LinphoneCallParams*)linphone_call_get_current_params((LinphoneCall*)lc));
 }
 
 extern "C" void Java_org_linphone_core_LinphoneCallImpl_enableCamera(JNIEnv *env, jobject thiz, jlong lc, jboolean b){
diff --git a/java/common/org/linphone/core/LinphoneCall.java b/java/common/org/linphone/core/LinphoneCall.java
index 76a5c0a38..b2342a410 100644
--- a/java/common/org/linphone/core/LinphoneCall.java
+++ b/java/common/org/linphone/core/LinphoneCall.java
@@ -209,8 +209,8 @@ public interface LinphoneCall {
 	/**
 	 * 
 	 * Same as getCurrentParams(), but deprecated.
+	 * @deprecated
 	**/
-	@deprecated
 	LinphoneCallParams getCurrentParamsCopy();
 	
 	void enableCamera(boolean enabled);
diff --git a/java/impl/org/linphone/core/LinphoneCallImpl.java b/java/impl/org/linphone/core/LinphoneCallImpl.java
index 661fde7ef..c276ce07d 100644
--- a/java/impl/org/linphone/core/LinphoneCallImpl.java
+++ b/java/impl/org/linphone/core/LinphoneCallImpl.java
@@ -21,8 +21,10 @@ package org.linphone.core;
 class LinphoneCallImpl implements LinphoneCall {
  
 	protected final long nativePtr;
+
 	boolean ownPtr = false;
 	Object userData;
+	LinphoneCore mCore;
 
 	native private void finalize(long nativePtr);
 	native private long  getCallLog(long nativePtr);
@@ -45,12 +47,14 @@ class LinphoneCallImpl implements LinphoneCall {
 	private native void setListener(long ptr, LinphoneCallListener listener);
 	native private long getDiversionAddress(long nativePtr);
 	native private Object getStats(long nativePtr, int stream_type);
+	native private LinphoneCore getCore(long nativePtr);
 	
 	/*
 	 * This method must always be called from JNI, nothing else.
 	 */
 	private LinphoneCallImpl(long aNativePtr)  {
 		nativePtr = aNativePtr;
+		mCore = getCore(nativePtr);
 	}
 	protected void finalize() throws Throwable {
 		finalize(nativePtr);
@@ -65,10 +69,14 @@ class LinphoneCallImpl implements LinphoneCall {
 	}
 	
 	public LinphoneCallStats getAudioStats() {
-		return (LinphoneCallStats)getStats(nativePtr, 0);
+		synchronized(mCore){
+			return (LinphoneCallStats)getStats(nativePtr, 0);
+		}
 	}
 	public LinphoneCallStats getVideoStats() {
-		return (LinphoneCallStats)getStats(nativePtr, 1);
+		synchronized(mCore){
+			return (LinphoneCallStats)getStats(nativePtr, 1);
+		}
 	}
 	public CallDirection getDirection() {
 		return isIncoming(nativePtr)?CallDirection.Incoming:CallDirection.Outgoing;
diff --git a/mediastreamer2 b/mediastreamer2
index ffdd8375f..1f17b3ba2 160000
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit ffdd8375f332e04c0d7642fb1da414124145256e
+Subproject commit 1f17b3ba22cb662c1c15655c8248036e7a69baf2