diff --git a/src/channel.cpp b/src/channel.cpp
index 85aae405..b1472133 100755
--- a/src/channel.cpp
+++ b/src/channel.cpp
@@ -569,16 +569,10 @@ CChannel::CChannel ( const bool bNIsServer ) : bIsServer ( bNIsServer ),
     vecNetwBufferInProps.Init ( iNumSupportedAudComprTypes *
         MAX_NET_BLOCK_SIZE_FACTOR + 1 );
 
-    // init special mode
-
-// TEST -> 128
-vecNetwBufferInProps[0].iAudioBlockSize = 128;
-vecNetwBufferInProps[0].eAudComprType = CT_NONE;
-vecNetwBufferInProps[0].iNetwInBufSize = AudioCompressionIn.Init (
-            vecNetwBufferInProps[0].iAudioBlockSize,
-            vecNetwBufferInProps[0].eAudComprType );
-
-
+    // init special mode (with invalid data)
+    vecNetwBufferInProps[0].iAudioBlockSize = 0;
+    vecNetwBufferInProps[0].eAudComprType   = CT_NONE;
+    vecNetwBufferInProps[0].iNetwInBufSize  = 0;
 
     for ( int i = 0; i < MAX_NET_BLOCK_SIZE_FACTOR; i++ )
     {
@@ -669,6 +663,10 @@ vecNetwBufferInProps[0].iNetwInBufSize = AudioCompressionIn.Init (
     QObject::connect ( &Protocol,
         SIGNAL ( NetTranspPropsReceived ( CNetworkTransportProps ) ),
         this, SLOT ( OnNetTranspPropsReceived ( CNetworkTransportProps ) ) );
+
+    QObject::connect ( &Protocol,
+        SIGNAL ( ReqNetTranspProps() ),
+        this, SLOT ( OnReqNetTranspProps() ) );
 }
 
 bool CChannel::ProtocolIsEnabled()
@@ -727,6 +725,9 @@ void CChannel::SetAudioBlockSizeAndComprIn ( const int iNewBlockSize,
     AudioCompressionIn.Init ( iNewBlockSize, eNewAudComprType );
 
     // initial value for connection time out counter
+
+// TODO FIXME this does not work correctly -> bug
+// (the calculation is correct but the value is not correctly applied)
     iConTimeOutStartVal = 
         ( CON_TIME_OUT_SEC_MAX * SYSTEM_SAMPLE_RATE ) / iNewBlockSize;
 }
@@ -889,26 +890,6 @@ void CChannel::OnChangeChanName ( QString strName )
     SetName ( strName );
 }
 
-
-
-
-void CChannel::OnNetTranspPropsReceived ( CNetworkTransportProps NetworkTransportProps )
-{
-    QMutexLocker locker ( &Mutex );
-
-// TEST
-// TODO use mutex in Put function
-// TODO check possiblity of received parameter -> error checking
-vecNetwBufferInProps[0].iAudioBlockSize = NetworkTransportProps.iMonoAudioBlockSize;
-vecNetwBufferInProps[0].eAudComprType = NetworkTransportProps.eAudioCodingType;
-vecNetwBufferInProps[0].iNetwInBufSize = AudioCompressionIn.Init (
-    vecNetwBufferInProps[0].iAudioBlockSize,
-    vecNetwBufferInProps[0].eAudComprType );
-}
-
-
-
-
 bool CChannel::GetAddress(CHostAddress& RetAddr)
 {
     QMutexLocker locker ( &Mutex );
@@ -925,6 +906,46 @@ bool CChannel::GetAddress(CHostAddress& RetAddr)
     }
 }
 
+
+
+
+void CChannel::OnNetTranspPropsReceived ( CNetworkTransportProps NetworkTransportProps )
+{
+    QMutexLocker locker ( &Mutex );
+
+// TEST
+// TODO use mutex in Put function
+// TODO check possiblity of received parameter -> error checking
+// utilize, e.g., MAX_MONO_AUD_BUFF_SIZE_AT_48KHZ
+vecNetwBufferInProps[0].iAudioBlockSize = NetworkTransportProps.iMonoAudioBlockSize;
+vecNetwBufferInProps[0].eAudComprType   = NetworkTransportProps.eAudioCodingType;
+vecNetwBufferInProps[0].iNetwInBufSize  = AudioCompressionIn.Init (
+    vecNetwBufferInProps[0].iAudioBlockSize,
+    vecNetwBufferInProps[0].eAudComprType );
+}
+
+void CChannel::OnReqNetTranspProps()
+{
+    CreateNetTranspPropsMessFromCurrentSettings();
+}
+
+void CChannel::CreateNetTranspPropsMessFromCurrentSettings()
+{
+    CNetworkTransportProps NetworkTransportProps (
+        iAudComprSizeOut,
+        iCurAudioBlockSizeOut,
+        1, // right now we only use mono
+        SYSTEM_SAMPLE_RATE, // right now only one sample rate is supported
+        AudioCompressionOut.GetType(),
+        0 );
+
+    // send current network transport properties
+    Protocol.CreateNetwTranspPropsMes ( NetworkTransportProps );
+}
+
+
+
+
 EPutDataStat CChannel::PutData ( const CVector<unsigned char>& vecbyData,
                                  int iNumBytes )
 {
@@ -1038,9 +1059,17 @@ EPutDataStat CChannel::PutData ( const CVector<unsigned char>& vecbyData,
             Mutex.unlock();
         }
 
-        // inform other objects that new connection was established
         if ( bNewConnection )
         {
+            // if this is a new connection and the current network packet is
+            // neither an audio or protocol packet, we have to query the
+            // network transport properties for the audio packets
+            if ( ( !bIsProtocolPacket ) && ( !bIsAudioPacket ) )
+            {
+                Protocol.CreateReqNetwTranspPropsMes();
+            }
+
+            // inform other objects that new connection was established
             emit NewConnection();
         }
     }
diff --git a/src/channel.h b/src/channel.h
index 44b4d347..467b1d46 100755
--- a/src/channel.h
+++ b/src/channel.h
@@ -145,6 +145,8 @@ void SetNetwBufSizeOut ( const int iNewAudioBlockSizeOut );
         Protocol.CreateConClientListMes ( vecChanInfo );
     }
 
+    void CreateNetTranspPropsMessFromCurrentSettings();
+
 protected:
     void SetAudioBlockSizeAndComprIn ( const int iNewBlockSize,
                                        const EAudComprType eNewAudComprType );
@@ -205,6 +207,7 @@ public slots:
     void OnChangeChanGain ( int iChanID, double dNewGain );
     void OnChangeChanName ( QString strName );
     void OnNetTranspPropsReceived ( CNetworkTransportProps NetworkTransportProps );
+    void OnReqNetTranspProps();
 
 signals:
     void MessReadyForSending ( CVector<uint8_t> vecMessage );
@@ -215,6 +218,7 @@ signals:
     void NameHasChanged();
     void ChatTextReceived ( QString strChatText );
     void PingReceived ( int iMs );
+    void ReqNetTranspProps();
 };
 
 
diff --git a/src/client.cpp b/src/client.cpp
index 32f5f8eb..47477955 100755
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -58,6 +58,9 @@ CClient::CClient ( const quint16 iPortNumber ) :
 
     QObject::connect ( &Channel, SIGNAL ( PingReceived ( int ) ),
         this, SLOT ( OnReceivePingMessage ( int ) ) );
+
+    QObject::connect ( &Channel, SIGNAL ( ReqNetTranspProps() ),
+        this, SLOT ( OnReqNetTranspProps() ) );
 }
 
 void CClient::OnSendProtMessage ( CVector<uint8_t> vecMessage )
@@ -77,6 +80,9 @@ for ( int i = 0; i < vecMessage.Size(); i++ ) {
 
 void CClient::OnReqJittBufSize()
 {
+
+// TODO cant we implement this OnReqJjittBufSize inside the channel object?
+
     Channel.CreateJitBufMes ( Channel.GetSockBufSize() );
 
 // FIXME: we set the network buffer size factor here, too -> in the
diff --git a/src/client.h b/src/client.h
index 41dca427..88d36bd8 100755
--- a/src/client.h
+++ b/src/client.h
@@ -127,7 +127,14 @@ public:
     int GetNetwBufSizeFactOut() { return Channel.GetNetwBufSizeFactOut(); }
 
     void SetAudioCompressionOut ( const EAudComprType eNewAudComprTypeOut )
-        { Channel.SetAudioCompressionOut ( eNewAudComprTypeOut ); }
+    {
+        Channel.SetAudioCompressionOut ( eNewAudComprTypeOut );
+
+        // tell the server that audio coding has changed (it
+        // is important to call this function AFTER we have applied
+        // the new setting to the channel!)
+        Channel.CreateNetTranspPropsMessFromCurrentSettings();
+    }
     EAudComprType GetAudioCompressionOut() { return Channel.GetAudioCompressionOut(); }
 
     void SetRemoteChanGain ( const int iId, const double dGain )
diff --git a/src/protocol.cpp b/src/protocol.cpp
index 26adf92e..9a33f0c3 100755
--- a/src/protocol.cpp
+++ b/src/protocol.cpp
@@ -880,7 +880,7 @@ bool CProtocol::EvaluateNetwTranspPropsMes ( const CVector<uint8_t>& vecData )
 
     // audio coding type (2 bytes) with error check
     const int iRecCodingType =
-        static_cast<unsigned short> ( GetValFromStream ( vecData, iPos, 2 ) );
+        static_cast<int> ( GetValFromStream ( vecData, iPos, 2 ) );
 
     if ( ( iRecCodingType != CT_NONE ) &&
          ( iRecCodingType != CT_IMAADPCM ) &&
@@ -889,6 +889,9 @@ bool CProtocol::EvaluateNetwTranspPropsMes ( const CVector<uint8_t>& vecData )
         return true;
     }
 
+    ReceivedNetwTranspProps.eAudioCodingType =
+        static_cast<EAudComprType> ( iRecCodingType );
+
     // argument for the audio coder (4 bytes)
     ReceivedNetwTranspProps.iAudioCodingArg =
         static_cast<unsigned int> ( GetValFromStream ( vecData, iPos, 4 ) );