diff --git a/sflphone-common/src/audio/mainbuffer.cpp b/sflphone-common/src/audio/mainbuffer.cpp
index 0e3449341016557f6fb9af9e2ff0fa7d7dd0f885..4c15008b0d5d0ee2264bebc2b77052b25b87354d 100644
--- a/sflphone-common/src/audio/mainbuffer.cpp
+++ b/sflphone-common/src/audio/mainbuffer.cpp
@@ -405,7 +405,9 @@ int MainBuffer::getData (void *buffer, int toCopy, unsigned short volume, CallID
 
         while (iter_id != callid_set->end()) {
 
-            size = getDataByID (mixBuffer, toCopy, volume, (CallID) (*iter_id), call_id);
+	    memset(mixBuffer, 0, toCopy);
+
+            size = getDataByID(mixBuffer, toCopy, volume, (CallID) (*iter_id), call_id);
 
             if (size > 0) {
                 for (int k = 0; k < nbSmplToCopy; k++) {
@@ -462,6 +464,8 @@ int MainBuffer::availForGet (CallID call_id)
         int nb_bytes;
         CallIDSet::iterator iter_id = callid_set->begin();
 
+	syncBuffers(call_id);
+
         for (iter_id = callid_set->begin(); iter_id != callid_set->end(); iter_id++) {
             nb_bytes = availForGetByID (*iter_id, call_id);
 
@@ -522,7 +526,6 @@ int MainBuffer::discard (int toDiscard, CallID call_id)
 
         return toDiscard;
     }
-
 }
 
 
@@ -599,6 +602,45 @@ void MainBuffer::flushAllBuffers()
     }
 }
 
+void MainBuffer:: syncBuffers(CallID call_id)
+{
+  
+    CallIDSet* callid_set = getCallIDSet(call_id);
+
+    if (callid_set == NULL)
+        return;
+
+    if (callid_set->empty()) {
+        _debug ("MainBuffer: CallIDSet with ID: \"%s\" is empty!", call_id.c_str());
+        return;
+    }
+
+    if (callid_set->size() == 1) {
+        // no need to resync, only one session
+        return;
+    }
+
+    int nbBuffers = 0;
+    float mean_nbBytes = 0.0;
+
+    CallIDSet::iterator iter_id = callid_set->begin();
+
+
+    // compute mean nb byte in buffers
+    for (iter_id = callid_set->begin(); iter_id != callid_set->end(); iter_id++) {
+        nbBuffers++;
+	mean_nbBytes += availForGetByID (*iter_id, call_id);
+    }
+    mean_nbBytes = mean_nbBytes / (float) nbBuffers;
+    
+    // resync buffers in this conference according to the computed mean
+    for (iter_id = callid_set->begin(); iter_id != callid_set->end(); iter_id++) {
+
+      if(availForGetByID (*iter_id, call_id) > (mean_nbBytes + 640))
+	  discardByID (640, *iter_id, call_id);
+    }
+}
+
 
 void MainBuffer::stateInfo()
 {
@@ -665,7 +707,4 @@ void MainBuffer::stateInfo()
         iter_buffer++;
     }
 
-
-
-
 }
diff --git a/sflphone-common/src/audio/mainbuffer.h b/sflphone-common/src/audio/mainbuffer.h
index 95dd787ea4c8aab914fcdb0307afd4f7e2b89de4..9b97a88fc000c9ad9c4628581d285da43222d84d 100644
--- a/sflphone-common/src/audio/mainbuffer.h
+++ b/sflphone-common/src/audio/mainbuffer.h
@@ -114,6 +114,8 @@ class MainBuffer {
 	void flushAllBuffers();
 
 	void flushDefault();
+ 
+	void syncBuffers(CallID call_id);
 
 	void stateInfo();
 
diff --git a/sflphone-common/src/audio/pulseaudio/pulselayer.cpp b/sflphone-common/src/audio/pulseaudio/pulselayer.cpp
index 56c2ab8c7b3e00defc0374325343bea67e3271b2..e8294513e28dbe42875a979c3a672956b7717e5e 100644
--- a/sflphone-common/src/audio/pulseaudio/pulselayer.cpp
+++ b/sflphone-common/src/audio/pulseaudio/pulselayer.cpp
@@ -260,6 +260,8 @@ PulseLayer::PulseLayer (ManagerImpl* manager)
     AudioLayer::_echocancelstate = true;
     AudioLayer::_noisesuppressstate = true;
 
+    byteCounter = 0;
+
     /*
     captureFile = new ofstream("captureFile", ofstream::binary);
     captureRsmplFile = new ofstream("captureRsmplFile", ofstream::binary);
@@ -902,8 +904,9 @@ void PulseLayer::writeToSpeaker (void)
 
                 }
 
+		
 		// Copy far-end signal in echo canceller to adapt filter coefficient
-		AudioLayer::_echoCanceller->putData(out, byteToGet);
+		// AudioLayer::_echoCanceller->putData(out, byteToGet);
 
                 pa_xfree (out);
 
@@ -971,11 +974,12 @@ void PulseLayer::readFromMic (void)
 	    // captureFilterFile->write ((const char *)rsmpl_out, nbSample*sizeof(SFLDataFormat));
 
 	    // echo cancellation processing
-	    int sampleready = _echoCanceller->processAudio(rsmpl_out, echoCancelledMic, nbSample*sizeof(SFLDataFormat));
+	    // int sampleready = _echoCanceller->processAudio(rsmpl_out, echoCancelledMic, nbSample*sizeof(SFLDataFormat));
 
             // getMainBuffer()->putData ( (void*) rsmpl_out, nbSample*sizeof (SFLDataFormat), 100);
-	    if(sampleready)
-	      getMainBuffer()->putData ( echoCancelledMic, sampleready*sizeof (SFLDataFormat), 100);
+	    // if(sampleready)
+	    // getMainBuffer()->putData ( echoCancelledMic, sampleready*sizeof (SFLDataFormat), 100);
+	    getMainBuffer()->putData ( rsmpl_out, nbSample*sizeof (SFLDataFormat), 100);
 
             pa_xfree (rsmpl_out);
 
@@ -987,10 +991,11 @@ void PulseLayer::readFromMic (void)
             _audiofilter->processAudio((SFLDataFormat *)data, filter_out, r);
 
 	    // echo cancellation processing
-	    int sampleready = _echoCanceller->processAudio((SFLDataFormat *)filter_out, echoCancelledMic, r);
+	    // int sampleready = _echoCanceller->processAudio((SFLDataFormat *)filter_out, echoCancelledMic, r);
 
             // no resampling required
-            getMainBuffer()->putData (echoCancelledMic, sampleready*sizeof (SFLDataFormat), 100);
+            // getMainBuffer()->putData (echoCancelledMic, sampleready*sizeof (SFLDataFormat), 100);
+	    getMainBuffer()->putData (filter_out, r, 100);
 
 	    pa_xfree(filter_out);
         }
diff --git a/sflphone-common/src/audio/pulseaudio/pulselayer.h b/sflphone-common/src/audio/pulseaudio/pulselayer.h
index d13c1e69385a45e1f5c31afabfcd8e2b1a7d2e1b..047fe84093f133c5ee4a29ae9b676d993944d774 100644
--- a/sflphone-common/src/audio/pulseaudio/pulselayer.h
+++ b/sflphone-common/src/audio/pulseaudio/pulselayer.h
@@ -287,6 +287,8 @@ class PulseLayer : public AudioLayer {
 
     // private:
 
+    int byteCounter;
+
 public: 
 
     friend class AudioLayerTest;