diff --git a/src/net/java/sip/communicator/impl/protocol/sip/CallPeerMediaHandler.java b/src/net/java/sip/communicator/impl/protocol/sip/CallPeerMediaHandler.java
index b42cbff5f..d107dea32 100644
--- a/src/net/java/sip/communicator/impl/protocol/sip/CallPeerMediaHandler.java
+++ b/src/net/java/sip/communicator/impl/protocol/sip/CallPeerMediaHandler.java
@@ -15,8 +15,10 @@
 import net.java.sip.communicator.impl.protocol.sip.sdp.*;
 import net.java.sip.communicator.service.neomedia.*;
 
-//disambiguates VideoListener which is also available in protocol.event
+//the following two disambiguate VideoListener which is also available in
+//protocol.event
 import net.java.sip.communicator.service.neomedia.event.SimpleAudioLevelListener;
+import net.java.sip.communicator.service.neomedia.event.CsrcAudioLevelListener;
 
 import net.java.sip.communicator.service.neomedia.device.*;
 import net.java.sip.communicator.service.neomedia.format.*;
@@ -213,6 +215,18 @@ public void videoRemoved(net.java.sip.communicator.service.neomedia
      */
     private Object streamAudioLevelListenerLock = new Object();
 
+    /**
+     * The listener that our <tt>CallPeer</tt> registers for CSRC audio level
+     * events.
+     */
+    private CsrcAudioLevelListener csrcAudioLevelListener = null;
+
+    /**
+     * The object that we are using to sync operations on
+     * <tt>csrcAudioLevelListener</tt>.
+     */
+    private Object csrcAudioLevelListenerLock = new Object();
+
     /**
      * Holds the zrtp controls used for the current call.
      */
@@ -768,25 +782,7 @@ private MediaStream configureAndStartStream(
         {
             this.audioStream = (AudioMediaStream)stream;
 
-            // if we already have a local level listener - register it now.
-            synchronized (localAudioLevelListenerLock)
-            {
-                if (localAudioLevelListener != null)
-                {
-                    audioStream.setLocalUserAudioLevelListener(
-                                    localAudioLevelListener);
-                }
-            }
-
-            // if we already have a stream level listener - register it now.
-            synchronized (streamAudioLevelListenerLock)
-            {
-                if (streamAudioLevelListener != null)
-                {
-                    audioStream.setStreamAudioLevelListener(
-                                    streamAudioLevelListener);
-                }
-            }
+            registerAudioLevelListeners(audioStream);
         }
         else
             setVideoStream((VideoMediaStream)stream);
@@ -807,6 +803,45 @@ private MediaStream configureAndStartStream(
         return stream;
     }
 
+    /**
+     * Registers all audio level listeners currently known to this media handler
+     * with the specified <tt>audioStream</tt>.
+     *
+     * @param audioStream the <tt>AudioMediaStream</tt> that we'd like to
+     * register our audio level listeners with.
+     */
+    private void registerAudioLevelListeners(AudioMediaStream audioStream)
+    {
+        // if we already have a local level listener - register it now.
+        synchronized (localAudioLevelListenerLock)
+        {
+            if (localAudioLevelListener != null)
+            {
+                audioStream.setLocalUserAudioLevelListener(
+                                localAudioLevelListener);
+            }
+        }
+
+        // if we already have a stream level listener - register it now.
+        synchronized (streamAudioLevelListenerLock)
+        {
+            if (streamAudioLevelListener != null)
+            {
+                audioStream.setStreamAudioLevelListener(
+                                streamAudioLevelListener);
+            }
+        }
+
+        // if we already have a csrc level listener - register it now.
+        synchronized (csrcAudioLevelListenerLock)
+        {
+            if (csrcAudioLevelListener != null)
+            {
+                audioStream.setCsrcAudioLevelListener(csrcAudioLevelListener);
+            }
+        }
+    }
+
     /**
      * Registers all dynamic payload mappings known to this
      * <tt>MediaHandler</tt> with the specified <tt>MediaStream</tt>.
@@ -1706,30 +1741,25 @@ public void setStreamAudioLevelListener(SimpleAudioLevelListener listener)
     }
 
     /**
-     * Adds a specific <tt>ConferenceMembersSoundLevelListener</tt> to the list
-     * of listeners interested in and notified about changes in conference
-     * members sound level.
+     * Sets <tt>csrcAudioLevelListener</tt> as the listener that will be
+     * receiving notifications for changes in the audio levels of the remote
+     * participants that our peer is mixing.
      *
-     * @param listener the <tt>ConferenceMembersSoundLevelListener</tt> to add
+     * @param csrcAudioLevelListener the <tt>CsrcAudioLevelListener</tt> to set
+     * to our audio streams.
      */
-    public void addConferenceMembersSoundLevelListener(
-                                                SoundLevelListener listener)
-    {
-
-    }
-
-    /**
-     * Removes a specific <tt>ConferenceMembersSoundLevelListener</tt> of the
-     * list of listeners interested in and notified about changes in conference
-     * members sound level.
-     *
-     * @param listener the <tt>ConferenceMembersSoundLevelListener</tt> to
-     * remove
-     */
-    public void removeConferenceMembersSoundLevelListener(
-                                                SoundLevelListener listener)
+    public void setCsrcAudioLevelListener(
+                                CsrcAudioLevelListener csrcAudioLevelListener)
     {
+        synchronized(csrcAudioLevelListenerLock)
+        {
+            this.csrcAudioLevelListener = csrcAudioLevelListener;
 
+            if(audioStream != null)
+            {
+                audioStream.setCsrcAudioLevelListener(csrcAudioLevelListener);
+            }
+        }
     }
 
     /**
@@ -1771,8 +1801,12 @@ boolean isSecure()
     }
 
     /**
+     * Passes <tt>multiStreamData</tt> to the video stream that we are using
+     * in this media handler (if any) so that the underlying ZRTP lib could
+     * properly handle stream security.
      *
-     * @param multiStreamData
+     * @param multiStreamData the data that we are supposed to pass to our
+     * video stream.
      */
     void startZrtpMultistream(byte[] multiStreamData)
     {
diff --git a/src/net/java/sip/communicator/impl/protocol/sip/CallPeerSipImpl.java b/src/net/java/sip/communicator/impl/protocol/sip/CallPeerSipImpl.java
index 64bc1b7fe..9ffdb495a 100644
--- a/src/net/java/sip/communicator/impl/protocol/sip/CallPeerSipImpl.java
+++ b/src/net/java/sip/communicator/impl/protocol/sip/CallPeerSipImpl.java
@@ -1802,6 +1802,8 @@ public void removeConferenceMembersSoundLevelListener(
      */
     public void audioLevelsReceived(long[][] audioLevels)
     {
+        if ( getConferenceMemberCount() == 0 )
+            return;
 
         //ConferenceMembersSoundLevelEvent evt
         //    = new ConferenceMembersSoundLevelEvent(this, levels);
diff --git a/src/net/java/sip/communicator/impl/protocol/sip/ConferenceMemberSipImpl.java b/src/net/java/sip/communicator/impl/protocol/sip/ConferenceMemberSipImpl.java
index 66e15c046..d59cbed1f 100644
--- a/src/net/java/sip/communicator/impl/protocol/sip/ConferenceMemberSipImpl.java
+++ b/src/net/java/sip/communicator/impl/protocol/sip/ConferenceMemberSipImpl.java
@@ -65,7 +65,7 @@ public class ConferenceMemberSipImpl
     /**
      * The SSRC value if transmitted by the focus of the conference.
      */
-    private String ssrc;
+    private long ssrc = -1;
 
     /**
      * Initializes a new <tt>ConferenceMemberSipImpl</tt> instance with a
@@ -141,19 +141,21 @@ else if (PENDING.equalsIgnoreCase(endpointStatus))
     }
 
     /**
-     * Return the SSRC value;
+     * Returns the SSRC value associated with this participant;
+     *
      * @return the ssrc
      */
-    public String getSSRC()
+    public long getSSRC()
     {
         return ssrc;
     }
 
     /**
-     * Changes SSRC value;
-     * @param ssrc the ssrc to set
+     * Sets the SSRC identifier of this member.
+     *
+     * @param ssrc the SSRC ID to set for this member.
      */
-    public void setSSRC(String ssrc)
+    public void setSSRC(long ssrc)
     {
         this.ssrc = ssrc;
     }
diff --git a/src/net/java/sip/communicator/impl/protocol/sip/OperationSetTelephonyConferencingSipImpl.java b/src/net/java/sip/communicator/impl/protocol/sip/OperationSetTelephonyConferencingSipImpl.java
index c4b202ea9..36e04bafc 100644
--- a/src/net/java/sip/communicator/impl/protocol/sip/OperationSetTelephonyConferencingSipImpl.java
+++ b/src/net/java/sip/communicator/impl/protocol/sip/OperationSetTelephonyConferencingSipImpl.java
@@ -1067,15 +1067,16 @@ private void setConferenceInfoDocument(
                         else if (ELEMENT_ENDPOINT.equals(userChildName))
                         {
                             endpointStatus = getEndpointStatus(userChild);
-                            ssrc
-                                = getEndpointMediaSrcId(
+                            ssrc = getEndpointMediaSrcId(
                                     userChild,
                                     MediaType.AUDIO);
                         }
                     }
                     existingConferenceMember.setDisplayName(displayName);
                     existingConferenceMember.setEndpointStatus(endpointStatus);
-                    existingConferenceMember.setSSRC(ssrc);
+
+                    if (ssrc != null)
+                        existingConferenceMember.setSSRC(Long.parseLong(ssrc));
 
                     if (addConferenceMember)
                         callPeer.addConferenceMember(existingConferenceMember);
diff --git a/src/net/java/sip/communicator/service/neomedia/event/CsrcAudioLevelListener.java b/src/net/java/sip/communicator/service/neomedia/event/CsrcAudioLevelListener.java
index 8f46b213d..084ed2632 100644
--- a/src/net/java/sip/communicator/service/neomedia/event/CsrcAudioLevelListener.java
+++ b/src/net/java/sip/communicator/service/neomedia/event/CsrcAudioLevelListener.java
@@ -17,7 +17,6 @@
  */
 public interface CsrcAudioLevelListener
 {
-
     /**
      * Called by the media service implementation after it has received audio
      * levels for the various participants (Contributing SouRCes) that are