diff --git a/src/channel.cpp b/src/channel.cpp
index d16b18e1..217510c0 100755
--- a/src/channel.cpp
+++ b/src/channel.cpp
@@ -229,8 +229,7 @@ CChannel::CChannel ()
 	SetSockBufSize ( DEF_NET_BUF_SIZE_NUM_BL );
 
 	// set initial input and output block size factors
-	SetNetwInBlSiFact ( NET_BLOCK_SIZE_FACTOR );
-	SetNetwOutBlSiFact ( NET_BLOCK_SIZE_FACTOR );
+	SetNetwBufSizeFact ( NET_BLOCK_SIZE_FACTOR );
 
 	/* init time-out for the buffer with zero -> no connection */
 	iConTimeOut = 0;
@@ -246,6 +245,9 @@ CChannel::CChannel ()
 
 	QObject::connect ( &Protocol, SIGNAL ( ReqJittBufSize() ),
 		SIGNAL ( ReqJittBufSize() ) );
+
+	QObject::connect ( &Protocol, SIGNAL ( ChangeNetwBlSiFact ( int ) ),
+		this, SLOT ( OnNetwBlSiFactChange ( int ) ) );
 }
 
 void CChannel::SetNetwInBlSiFact ( const int iNewBlockSizeFactor )
@@ -288,7 +290,9 @@ void CChannel::OnSendProtMessage ( CVector<uint8_t> vecMessage )
 		Protocol.DeleteSendMessQueue();
 	}
 }
-
+
+
+// socket buffer size
 void CChannel::SetSockBufSize ( const int iNumBlocks )
 {
 	/* this opperation must be done with mutex */
@@ -319,7 +323,31 @@ qDebug ( "new jitter buffer size: %d", iNewJitBufSize );
 
 	SetSockBufSize ( iNewJitBufSize );
 }
-
+
+
+// network buffer size factor
+void CChannel::SetNetwBufSizeFact ( const int iNetNetwBlSiFact )
+{
+	/* this opperation must be done with mutex */
+	Mutex.lock ();
+	{
+		iCurNetwBlSiFact = iNetNetwBlSiFact;
+
+		SetNetwInBlSiFact ( iNetNetwBlSiFact );
+		SetNetwOutBlSiFact ( iNetNetwBlSiFact );
+	}
+	Mutex.unlock ();
+}
+
+void CChannel::OnNetwBlSiFactChange ( int iNewNetwBlSiFact )
+{
+// TEST
+qDebug ( "new network block size factor: %d", iNewNetwBlSiFact );
+
+	SetNetwBufSizeFact ( iNewNetwBlSiFact );
+}
+
+
 bool CChannel::GetAddress(CHostAddress& RetAddr)
 {
 	if (IsConnected())
@@ -403,7 +431,7 @@ for ( int i = 0; i < iCurNetwInBlSiFact * MIN_BLOCK_SIZE_SAMPLES; i++ ) {
 
 // TEST debug output
 CHostAddress address ( GetAddress() );
-qDebug ( "new connection with IP %s\n", address.InetAddr.toString().latin1() );
+qDebug ( "new connection with IP %s", address.InetAddr.toString().latin1() );
 
 		emit NewConnection();
 	}
diff --git a/src/channel.h b/src/channel.h
index 5e2aee75..04e54c62 100755
--- a/src/channel.h
+++ b/src/channel.h
@@ -83,6 +83,9 @@ public:
 	void SetSockBufSize ( const int iNumBlocks );
 	int GetSockBufSize();
 
+	void SetNetwBufSizeFact ( const int iNetNetwBlSiFact );
+	int GetNetwBufSizeFact() { return iCurNetwBlSiFact; }
+
 	// network protocol interface
 	void CreateJitBufMes ( const int iJitBufSize )
 	{ 
@@ -91,9 +94,17 @@ public:
 			Protocol.CreateJitBufMes ( iJitBufSize );
 		}
 	}
-
 	void CreateReqJitBufMes() { Protocol.CreateReqJitBufMes(); }
 
+	void CreateNetwBlSiFactMes ( const int iNetwBlSiFact )
+	{ 
+		if ( IsConnected() )
+		{
+			Protocol.CreateNetwBlSiFactMes ( iNetwBlSiFact );
+		}
+	}
+
+
 protected:
 	void SetNetwInBlSiFact ( const int iNewBlockSizeFactor );
 	void SetNetwOutBlSiFact ( const int iNewBlockSizeFactor );
@@ -129,13 +140,16 @@ protected:
 	int					iConTimeOut;
 	int					iConTimeOutStartVal;
 
-	int					iCurNetwInBlSiFact;
+	int					iCurNetwInBlSiFact;
+
+	int					iCurNetwBlSiFact; // TODO, will be replaced by in/out settings
 
 	QMutex Mutex;
 
 public slots:
 	void OnSendProtMessage ( CVector<uint8_t> vecMessage );
 	void OnJittBufSizeChange ( int iNewJitBufSize );
+	void OnNetwBlSiFactChange ( int iNewNetwBlSiFact );
 
 signals:
 	void MessReadyForSending ( CVector<uint8_t> vecMessage );
diff --git a/src/client.h b/src/client.h
index cc9a4930..3f282e85 100755
--- a/src/client.h
+++ b/src/client.h
@@ -57,34 +57,33 @@ class CClient : public QObject, public QThread
 
 public:
 	CClient();
-	virtual ~CClient () {}
+	virtual ~CClient() {}
 
-	void Init ();
-	bool Stop ();
-	bool IsRunning () { return bRun; }
+	void Init();
+	bool Stop();
+	bool IsRunning() { return bRun; }
 	bool SetServerAddr ( QString strNAddr );
-	double MicLevelL () { return SignalLevelMeterL.MicLevel (); }
-	double MicLevelR () { return SignalLevelMeterR.MicLevel (); }
-	bool IsConnected () { return Channel.IsConnected (); }
+	double MicLevelL() { return SignalLevelMeterL.MicLevel(); }
+	double MicLevelR() { return SignalLevelMeterR.MicLevel(); }
+	bool IsConnected() { return Channel.IsConnected(); }
 
 	/* we want to return the standard deviation. For that we need to calculate
 	   the sqaure root */
-	double GetTimingStdDev () { return sqrt ( RespTimeMoAvBuf.GetAverage () ); }
+	double GetTimingStdDev() { return sqrt ( RespTimeMoAvBuf.GetAverage() ); }
 
-	int GetAudioInFader () { return iAudioInFader; }
+	int GetAudioInFader() { return iAudioInFader; }
 	void SetAudioInFader ( const int iNV ) { iAudioInFader = iNV; }
 
-	int GetReverbLevel () { return iReverbLevel; }
+	int GetReverbLevel() { return iReverbLevel; }
 	void SetReverbLevel ( const int iNL ) { iReverbLevel = iNL; }
 
-	bool IsReverbOnLeftChan () { return bReverbOnLeftChan; }
+	bool IsReverbOnLeftChan() { return bReverbOnLeftChan; }
 	void SetReverbOnLeftChan ( const bool bIL )
 	{
 		bReverbOnLeftChan = bIL;
-		AudioReverb.Clear ();
+		AudioReverb.Clear();
 	}
 
-
 	void SetSockBufSize ( const int iNumBlocks )
 	{
 		// set the new socket size
@@ -93,11 +92,23 @@ public:
 		// tell the server that size has changed
 		Channel.CreateJitBufMes ( iNumBlocks );
 	}
-	int GetSockBufSize () { return Channel.GetSockBufSize (); }
+	int GetSockBufSize() { return Channel.GetSockBufSize (); }
+
+
+
+	void SetNetwBufSizeFact ( const int iNetNetwBlSiFact )
+	{
+		// set the new socket size
+		Channel.SetNetwBufSizeFact ( iNetNetwBlSiFact );
+
+		// tell the server that size has changed
+		Channel.CreateNetwBlSiFactMes ( iNetNetwBlSiFact );
+	}
+	int GetNetwBufSizeFact() { return Channel.GetNetwBufSizeFact(); }
 
 
-	CSound* GetSndInterface () { return &Sound; }
-	CChannel* GetChannel () { return &Channel; }
+	CSound* GetSndInterface() { return &Sound; }
+	CChannel* GetChannel() { return &Channel; }
 
 
 	// settings
diff --git a/src/llconclientdlg.cpp b/src/llconclientdlg.cpp
index 5af64a81..24dbe696 100755
--- a/src/llconclientdlg.cpp
+++ b/src/llconclientdlg.cpp
@@ -58,8 +58,7 @@ CLlconClientDlg::CLlconClientDlg ( CClient* pNCliP, QWidget* parent,
 
 	/* set text for version and application name */
 	TextLabelNameVersion->
-		setText(QString(APP_NAME) + tr(" client ") + QString(VERSION) +
-		" (" + QString().setNum(MIN_BLOCK_DURATION_MS * NET_BLOCK_SIZE_FACTOR) + " ms)");
+		setText(QString(APP_NAME) + tr(" client ") + QString(VERSION));
 
 	/* init server address line edit */
 	LineEditServerAddr->setText ( pClient->strIPAddress.c_str () );
@@ -99,6 +98,12 @@ CLlconClientDlg::CLlconClientDlg ( CClient* pNCliP, QWidget* parent,
 	SliderNetBuf->setValue(iCurNumNetBuf);
 	TextNetBuf->setText("Size: " + QString().setNum(iCurNumNetBuf));
 
+	/* network buffer size factor */
+	SliderNetBufSiFact->setRange(1, NET_BLOCK_SIZE_FACTOR_MAX);
+	const int iCurNetBufSiFact = pClient->GetNetwBufSizeFact();
+	SliderNetBufSiFact->setValue(iCurNetBufSiFact);
+	TextNetBufSiFact->setText("Fact.: " + QString().setNum(iCurNetBufSiFact));
+
 	/* audio in fader */
 	SliderAudInFader->setRange(0, AUD_FADER_IN_MAX);
 	const int iCurAudInFader = pClient->GetAudioInFader();
@@ -145,9 +150,12 @@ CLlconClientDlg::CLlconClientDlg ( CClient* pNCliP, QWidget* parent,
 	QObject::connect(SliderSndBufIn, SIGNAL(valueChanged(int)),
 		this, SLOT(OnSliderSndBufInChange(int)));
 	QObject::connect(SliderSndBufOut, SIGNAL(valueChanged(int)),
-		this, SLOT(OnSliderSndBufOutChange(int)));
+		this, SLOT(OnSliderSndBufOutChange(int)));
+
 	QObject::connect(SliderNetBuf, SIGNAL(valueChanged(int)),
 		this, SLOT(OnSliderNetBuf(int)));
+	QObject::connect(SliderNetBufSiFact, SIGNAL(valueChanged(int)),
+		this, SLOT(OnSliderNetBufSiFact(int)));
 
 	QObject::connect(SliderAudInFader, SIGNAL(valueChanged(int)),
 		this, SLOT(OnSliderAudInFader(int)));
@@ -240,6 +248,12 @@ void CLlconClientDlg::OnSliderNetBuf(int value)
 	pClient->SetSockBufSize ( value );
 	TextNetBuf->setText("Size: " + QString().setNum(value));
 }
+
+void CLlconClientDlg::OnSliderNetBufSiFact(int value)
+{
+	pClient->SetNetwBufSizeFact ( value );
+	TextNetBufSiFact->setText("Fact.: " + QString().setNum(value));
+}
 
 void CLlconClientDlg::OnTimerSigMet ()
 {
diff --git a/src/llconclientdlg.h b/src/llconclientdlg.h
index c136540e..aac3273d 100755
--- a/src/llconclientdlg.h
+++ b/src/llconclientdlg.h
@@ -88,6 +88,7 @@ public slots:
 	void OnSliderSndBufInChange ( int value );
 	void OnSliderSndBufOutChange ( int value );
 	void OnSliderNetBuf ( int value );
+	void OnSliderNetBufSiFact ( int value );
 	void OnSliderAudInFader ( int value ) { pClient->SetAudioInFader(value); }
 	void OnSliderAudReverb ( int value )
 		{ pClient->SetReverbLevel ( AUD_REVERB_MAX - value ); }
diff --git a/src/llconclientdlgbase.ui b/src/llconclientdlgbase.ui
index 509d3523..fafcb72c 100755
--- a/src/llconclientdlgbase.ui
+++ b/src/llconclientdlgbase.ui
@@ -11,8 +11,8 @@
         <rect>
             <x>0</x>
             <y>0</y>
-            <width>814</width>
-            <height>287</height>
+            <width>890</width>
+            <height>288</height>
         </rect>
     </property>
     <property stdset="1">
@@ -733,6 +733,64 @@
                 </widget>
             </vbox>
         </widget>
+        <widget>
+            <class>QGroupBox</class>
+            <property stdset="1">
+                <name>name</name>
+                <cstring>GroupBoxNetwBuf</cstring>
+            </property>
+            <property stdset="1">
+                <name>title</name>
+                <string>Block Size</string>
+            </property>
+            <vbox>
+                <property stdset="1">
+                    <name>margin</name>
+                    <number>11</number>
+                </property>
+                <property stdset="1">
+                    <name>spacing</name>
+                    <number>6</number>
+                </property>
+                <widget>
+                    <class>QLabel</class>
+                    <property stdset="1">
+                        <name>name</name>
+                        <cstring>TextNetBufSiFact</cstring>
+                    </property>
+                    <property stdset="1">
+                        <name>text</name>
+                        <string>Size</string>
+                    </property>
+                    <property stdset="1">
+                        <name>alignment</name>
+                        <set>AlignCenter</set>
+                    </property>
+                    <property>
+                        <name>hAlign</name>
+                    </property>
+                </widget>
+                <widget>
+                    <class>QSlider</class>
+                    <property stdset="1">
+                        <name>name</name>
+                        <cstring>SliderNetBufSiFact</cstring>
+                    </property>
+                    <property stdset="1">
+                        <name>pageStep</name>
+                        <number>1</number>
+                    </property>
+                    <property stdset="1">
+                        <name>orientation</name>
+                        <enum>Vertical</enum>
+                    </property>
+                    <property stdset="1">
+                        <name>tickmarks</name>
+                        <enum>Both</enum>
+                    </property>
+                </widget>
+            </vbox>
+        </widget>
         <widget>
             <class>QGroupBox</class>
             <property stdset="1">
diff --git a/src/llconserverdlg.cpp b/src/llconserverdlg.cpp
index 88acef31..8495c726 100755
--- a/src/llconserverdlg.cpp
+++ b/src/llconserverdlg.cpp
@@ -32,8 +32,7 @@ CLlconServerDlg::CLlconServerDlg ( CServer* pNServP, QWidget* parent,
 {
 	/* set text for version and application name */
 	TextLabelNameVersion->
-		setText(QString(APP_NAME) + tr(" server ") + QString(VERSION) +
-		" (" + QString().setNum(MIN_BLOCK_DURATION_MS * NET_BLOCK_SIZE_FACTOR) + " ms)");
+		setText(QString(APP_NAME) + tr(" server ") + QString(VERSION));
 
 	/* Create bitmaps */
 	/* Define size of the bitmaps */
diff --git a/src/protocol.cpp b/src/protocol.cpp
index 2988103a..0b1070f0 100755
--- a/src/protocol.cpp
+++ b/src/protocol.cpp
@@ -30,7 +30,7 @@ MAIN FRAME
 MESSAGES
 --------
 
-- Acknowledgement message:             PROTMESSID_ACKN
+- Acknowledgement message:                    PROTMESSID_ACKN
 
 	+-----------------------------------+
 	| 2 bytes ID of message to be ackn. |
@@ -39,16 +39,23 @@ MESSAGES
 	note: the cnt value is the same as of the message to be acknowledged
 
 
-- Jitter buffer size:                  PROTMESSID_JITT_BUF_SIZE
+- Jitter buffer size:                         PROTMESSID_JITT_BUF_SIZE
 
 	+--------------------------+
 	| 2 bytes number of blocks |
 	+--------------------------+
 
-- Request jitter buffer size:          PROTMESSID_REQ_JITT_BUF_SIZE
+- Request jitter buffer size:                 PROTMESSID_REQ_JITT_BUF_SIZE
 
 	note: does not have any data -> n = 0
 
+- network buffer block size factor            PROTMESSID_NET_BLSI_FACTOR
+
+	note: size, relative to minimum block size
+
+	+----------------+
+	| 2 bytes factor |
+	+----------------+
 
 
 
@@ -297,6 +304,20 @@ vecbyDataConv[i] = static_cast<uint8_t> ( vecbyData[i] );
 				// send acknowledge message
 				CreateAndSendAcknMess ( iRecID, iRecCounter );
 
+				break;
+
+			case PROTMESSID_NET_BLSI_FACTOR:
+
+				// extract data from stream and emit signal for received value
+				iPos = 0;
+				iData = static_cast<int> ( GetValFromStream ( vecData, iPos, 2 ) );
+
+				// invoke message action
+				emit ChangeNetwBlSiFact ( iData );
+
+				// send acknowledge message
+				CreateAndSendAcknMess ( iRecID, iRecCounter );
+
 				break;
 			}
 		}
@@ -333,6 +354,17 @@ void CProtocol::CreateReqJitBufMes()
 	CreateAndSendMessage ( PROTMESSID_REQ_JITT_BUF_SIZE, CVector<uint8_t> ( 0 ) );
 }
 
+void CProtocol::CreateNetwBlSiFactMes ( const int iNetwBlSiFact )
+{
+	CVector<uint8_t>	vecData ( 2 ); // 2 bytes of data
+	unsigned int		iPos = 0; // init position pointer
+
+	// build data vector
+	PutValOnStream ( vecData, iPos, static_cast<uint32_t> ( iNetwBlSiFact ), 2 );
+
+	CreateAndSendMessage ( PROTMESSID_NET_BLSI_FACTOR, vecData );
+}
+
 
 /******************************************************************************\
 * Message generation (parsing)                                                 *
diff --git a/src/protocol.h b/src/protocol.h
index ec0d9bf8..9828923a 100755
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -40,6 +40,7 @@
 #define PROTMESSID_JITT_BUF_SIZE		10 // jitter buffer size
 #define PROTMESSID_REQ_JITT_BUF_SIZE	11 // request jitter buffer size
 #define PROTMESSID_PING					12 // for measuring ping time
+#define PROTMESSID_NET_BLSI_FACTOR		13 // network buffer size factor
 
 // lengths of message as defined in protocol.cpp file
 #define MESS_HEADER_LENGTH_BYTE		5 /* ID, cnt, length */
@@ -60,6 +61,7 @@ public:
 
 	void CreateJitBufMes ( const int iJitBufSize );
 	void CreateReqJitBufMes();
+	void CreateNetwBlSiFactMes ( const int iNetwBlSiFact );
 
 	void CreateAndSendAcknMess ( const int& iID, const int& iCnt );
 
@@ -137,6 +139,7 @@ signals:
 
 	// receiving
 	void ChangeJittBufSize ( int iNewJitBufSize );
+	void ChangeNetwBlSiFact ( int iNewNetwBlSiFact );
 	void ReqJittBufSize();
 };
 
diff --git a/src/settings.cpp b/src/settings.cpp
index a156ecbc..1d3d6c0d 100755
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -26,16 +26,16 @@
 
 
 /* Implementation *************************************************************/
-void CSettings::Load ()
+void CSettings::Load()
 {
 	/* load settings from init-file */
-	ReadIniFile ();
+	ReadIniFile();
 }
 
 void CSettings::Save()
 {
 	/* write settings in init-file */
-	WriteIniFile ();
+	WriteIniFile();
 }
 
 
@@ -81,6 +81,11 @@ void CSettings::ReadIniFile()
 	if ( GetNumericIniSet(ini, "Client", "jitbuf", 0, MAX_NET_BUF_SIZE_NUM_BL, iValue ) == TRUE ) {
 		pClient->SetSockBufSize ( iValue );
 	}
+
+	// network buffer size factor
+	if ( GetNumericIniSet(ini, "Client", "netwbusifact", 1, NET_BLOCK_SIZE_FACTOR_MAX, iValue ) == TRUE ) {
+		pClient->SetNetwBufSizeFact ( iValue );
+	}
 }
 
 void CSettings::WriteIniFile()
@@ -91,22 +96,25 @@ void CSettings::WriteIniFile()
 	PutIniSetting ( ini, "Client", "ipaddress", pClient->strIPAddress.c_str() );
 
 	// audio fader
-	SetNumericIniSet ( ini, "Client", "audfad", pClient->GetAudioInFader () );
+	SetNumericIniSet ( ini, "Client", "audfad", pClient->GetAudioInFader() );
 
 	// reverberation level
-	SetNumericIniSet ( ini, "Client", "revlev", pClient->GetReverbLevel () );
+	SetNumericIniSet ( ini, "Client", "revlev", pClient->GetReverbLevel() );
 
 	// reverberation channel assignment
-	SetFlagIniSet ( ini, "Client", "reverblchan", pClient->IsReverbOnLeftChan () );
+	SetFlagIniSet ( ini, "Client", "reverblchan", pClient->IsReverbOnLeftChan() );
 
 	// sound card in number of buffers
-	SetNumericIniSet ( ini, "Client", "audinbuf", pClient->GetSndInterface()->GetInNumBuf () );
+	SetNumericIniSet ( ini, "Client", "audinbuf", pClient->GetSndInterface()->GetInNumBuf() );
 
 	// sound card out number of buffers
-	SetNumericIniSet ( ini, "Client", "audoutbuf", pClient->GetSndInterface()->GetOutNumBuf () );
+	SetNumericIniSet ( ini, "Client", "audoutbuf", pClient->GetSndInterface()->GetOutNumBuf() );
 
 	// network jitter buffer size
-	SetNumericIniSet ( ini, "Client", "jitbuf", pClient->GetSockBufSize () );
+	SetNumericIniSet ( ini, "Client", "jitbuf", pClient->GetSockBufSize() );
+
+	// network buffer size factor
+	SetNumericIniSet ( ini, "Client", "netwbusifact", pClient->GetNetwBufSizeFact() );
 
 
 	/* Save settings in init-file */
@@ -121,7 +129,7 @@ bool CSettings::GetNumericIniSet ( INIFile& theINI, string strSection,
 	bool bReturn = FALSE;
 
 	const string strGetIni =
-		GetIniSetting ( theINI, strSection.c_str (), strKey.c_str () );
+		GetIniSetting ( theINI, strSection.c_str(), strKey.c_str() );
 
 	/* Check if it is a valid parameter */
 	if ( !strGetIni.empty () )
@@ -144,7 +152,7 @@ void CSettings::SetNumericIniSet ( INIFile& theINI, string strSection,
 	char cString[256];
 
 	sprintf ( cString, "%d", iValue );
-	PutIniSetting ( theINI, strSection.c_str (), strKey.c_str (), cString );
+	PutIniSetting ( theINI, strSection.c_str(), strKey.c_str(), cString );
 }
 
 bool CSettings::GetFlagIniSet ( INIFile& theINI, string strSection,
@@ -154,11 +162,11 @@ bool CSettings::GetFlagIniSet ( INIFile& theINI, string strSection,
 	bool bReturn = FALSE;
 
 	const string strGetIni =
-		GetIniSetting ( theINI, strSection.c_str (), strKey.c_str () );
+		GetIniSetting ( theINI, strSection.c_str(), strKey.c_str() );
 
-	if ( !strGetIni.empty () )
+	if ( !strGetIni.empty() )
 	{
-		if ( atoi ( strGetIni.c_str () ) )
+		if ( atoi ( strGetIni.c_str() ) )
 		{
 			bValue = TRUE;
 		}
@@ -178,11 +186,11 @@ void CSettings::SetFlagIniSet ( INIFile& theINI, string strSection, string strKe
 {
 	if ( bValue == TRUE )
 	{
-		PutIniSetting ( theINI, strSection.c_str (), strKey.c_str (), "1" );
+		PutIniSetting ( theINI, strSection.c_str(), strKey.c_str(), "1" );
 	}
 	else
 	{
-		PutIniSetting ( theINI, strSection.c_str (), strKey.c_str (), "0" );
+		PutIniSetting ( theINI, strSection.c_str(), strKey.c_str(), "0" );
 	}
 }