diff --git a/src/channel.cpp b/src/channel.cpp
index d4015d8c..69effcdc 100755
--- a/src/channel.cpp
+++ b/src/channel.cpp
@@ -28,13 +28,15 @@
 /******************************************************************************\
 * CChannelSet                                                                  *
 \******************************************************************************/
-CChannelSet::CChannelSet() : bWriteStatusHTMLFile ( false )
+CChannelSet::CChannelSet ( const bool bForceLowUploadRate ) :
+    bWriteStatusHTMLFile ( false )
 {
     // enable all channels and set server flag
     for ( int i = 0; i < MAX_NUM_CHANNELS; i++ )
     {
         vecChannels[i].SetEnable ( true );
         vecChannels[i].SetIsServer ( true );
+        vecChannels[i].SetForceLowUploadRate ( bForceLowUploadRate );
     }
 
     // define colors for chat window identifiers
@@ -527,6 +529,7 @@ void CChannelSet::WriteHTMLChannelList()
 \******************************************************************************/
 CChannel::CChannel() : sName ( "" ),
     vecdGains ( MAX_NUM_CHANNELS, (double) 1.0 ), bIsServer ( false ),
+    bForceLowUploadRate ( false ),
     // it is important to give the following parameters meaningful initial
     // values because they are dependend on each other
     iCurSockBufSize    ( DEF_NET_BUF_SIZE_NUM_BL ),
@@ -636,6 +639,19 @@ void CChannel::SetEnable ( const bool bNEnStat )
     }
 }
 
+void CChannel::SetForceLowUploadRate ( const bool bNFoLoUpRat )
+{
+    if ( bNFoLoUpRat )
+    {
+        // initialize with low upload rate parameters and set flag so that
+        // these parameters are not changed anymore
+        SetNetwBufSizeFactOut ( LOW_UPL_SET_BLOCK_SIZE_FACTOR_OUT );
+        SetAudioCompressionOut ( LOW_UPL_SET_AUDIO_COMPRESSION );
+    }
+
+    bForceLowUploadRate = bNFoLoUpRat;
+}
+
 void CChannel::SetNetwInBlSiFactAndCompr ( const int iNewBlockSizeFactor,
                                            const CAudioCompression::EAudComprType eNewAudComprType )
 {
@@ -660,26 +676,32 @@ void CChannel::SetNetwBufSizeFactOut ( const int iNewNetwBlSiFactOut )
 {
     QMutexLocker locker ( &Mutex );
 
-    // store new value
-    iCurNetwOutBlSiFact = iNewNetwBlSiFactOut;
+    if ( !bForceLowUploadRate )
+    {
+        // store new value
+        iCurNetwOutBlSiFact = iNewNetwBlSiFactOut;
 
-    // init audio compression and get audio compression block size
-    iAudComprSizeOut = AudioCompressionOut.Init (
-        iNewNetwBlSiFactOut * MIN_BLOCK_SIZE_SAMPLES, eAudComprTypeOut );
+        // init audio compression and get audio compression block size
+        iAudComprSizeOut = AudioCompressionOut.Init (
+            iNewNetwBlSiFactOut * MIN_BLOCK_SIZE_SAMPLES, eAudComprTypeOut );
 
-    // init conversion buffer
-    ConvBuf.Init ( iNewNetwBlSiFactOut * MIN_BLOCK_SIZE_SAMPLES );
+        // init conversion buffer
+        ConvBuf.Init ( iNewNetwBlSiFactOut * MIN_BLOCK_SIZE_SAMPLES );
+    }
 }
 
 void CChannel::SetAudioCompressionOut ( const CAudioCompression::EAudComprType eNewAudComprTypeOut )
 {
-    // store new value
-    eAudComprTypeOut = eNewAudComprTypeOut;
+    if ( !bForceLowUploadRate )
+    {
+        // store new value
+        eAudComprTypeOut = eNewAudComprTypeOut;
 
-    // call "set network buffer size factor" function because its initialization
-    // depends on the audio compression format and implicitely, the audio compression
-    // is initialized
-    SetNetwBufSizeFactOut ( iCurNetwOutBlSiFact );
+        // call "set network buffer size factor" function because its initialization
+        // depends on the audio compression format and implicitely, the audio compression
+        // is initialized
+        SetNetwBufSizeFactOut ( iCurNetwOutBlSiFact );
+    }
 }
 
 void CChannel::SetSockBufSize ( const int iNumBlocks )
diff --git a/src/channel.h b/src/channel.h
index 3e781df4..1452f871 100755
--- a/src/channel.h
+++ b/src/channel.h
@@ -41,10 +41,10 @@
 // Set the time-out for the input buffer until the state changes from
 // connected to not-connected (the actual time depends on the way the error
 // correction is implemented)
-#define CON_TIME_OUT_SEC_MAX        5 // seconds
+#define CON_TIME_OUT_SEC_MAX                5 // seconds
 
 // no valid channel number
-#define INVALID_CHANNEL_ID          ( MAX_NUM_CHANNELS + 1 )
+#define INVALID_CHANNEL_ID                  ( MAX_NUM_CHANNELS + 1 )
 
 enum EPutDataStat
 {
@@ -63,6 +63,10 @@ enum EGetDataStat
     GS_CHAN_NOT_CONNECTED
 };
 
+// low upload data rate settings
+#define LOW_UPL_SET_AUDIO_COMPRESSION       CAudioCompression::CT_MSADPCM
+#define LOW_UPL_SET_BLOCK_SIZE_FACTOR_OUT   MAX_NET_BLOCK_SIZE_FACTOR
+
 
 /* Classes ********************************************************************/
 // CChannel --------------------------------------------------------------------
@@ -83,7 +87,8 @@ public:
     bool IsConnected() const { return iConTimeOut > 0; }
 
     void SetEnable ( const bool bNEnStat );
-    void SetIsServer ( const bool bNEnStat ) { bIsServer = bNEnStat; }
+    void SetIsServer ( const bool bNIsServer ) { bIsServer = bNIsServer; }
+    void SetForceLowUploadRate ( const bool bNFoLoUpRat );
 
     void SetAddress ( const CHostAddress NAddr ) { InetAddr = NAddr; }
     bool GetAddress ( CHostAddress& RetAddr );
@@ -173,6 +178,7 @@ protected:
 
     bool                bIsEnabled;
     bool                bIsServer;
+    bool                bForceLowUploadRate;
 
     int                 iCurNetwInBlSiFact;
     int                 iCurNetwOutBlSiFact;
@@ -215,7 +221,7 @@ class CChannelSet : public QObject
     Q_OBJECT
 
 public:
-    CChannelSet();
+    CChannelSet ( const bool bForceLowUploadRate );
     virtual ~CChannelSet() {}
 
     bool PutData ( const CVector<unsigned char>& vecbyRecBuf,
diff --git a/src/main.cpp b/src/main.cpp
index 7d3232d4..e0648d6a 100755
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -46,6 +46,7 @@ int main ( int argc, char** argv )
     bool        bIsClient             = true;
     bool        bUseGUI               = true;
     bool        bUseServerLogging     = false;
+    bool        bForceLowUploadRate   = false;
     quint16     iPortNumber           = LLCON_PORT_NUMBER;
 	std::string strIniFileName        = "";
     std::string strHTMLStatusFileName = "";
@@ -80,7 +81,15 @@ int main ( int argc, char** argv )
 			continue;
 		}
 
-		/* Port number ------------------------------------------------------------ */
+		/* Force low upload data rate flag ---------------------------------------- */
+        if ( GetFlagArgument ( argc, argv, i, "-u", "--lowuploadrate" ) )
+        {
+	        bForceLowUploadRate = true;
+            cerr << "force low upload rate" << std::endl;
+	        continue;
+        }
+
+        /* Port number ------------------------------------------------------------ */
 		if ( GetNumericArgument ( argc, argv, i, "-p", "--port",
                                   0, 65535, rDbleArgument ) )
 		{
@@ -178,7 +187,8 @@ int main ( int argc, char** argv )
 
             CServer Server ( bUseServerLogging, iPortNumber,
                              strHTMLStatusFileName.c_str(),
-                             strServerName.c_str() );
+                             strServerName.c_str(),
+                             bForceLowUploadRate );
 
             if ( bUseGUI )
             {
@@ -233,6 +243,7 @@ std::string UsageArguments ( char **argv )
 		"  -i, --inifile              initialization file name (only available for client)\n"
 		"  -p, --port                 local port number (only avaiable for server)\n"
 		"  -m, --htmlstatus           enable HTML status file, set file name (only avaiable for server)\n"
+		"  -u, --lowuploadrate        force low upload rate (only avaiable for server)\n"
 		"  -h, -?, --help             this help text\n"
 		"Example: " + std::string ( argv[0] ) + " -l -inifile myinifile.ini\n";
 }
diff --git a/src/server.cpp b/src/server.cpp
index 7bb98f24..d14e7a07 100755
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -28,8 +28,10 @@
 /* Implementation *************************************************************/
 CServer::CServer ( const bool bUseLogging, const quint16 iPortNumber,
                    const QString& strHTMLStatusFileName,
-                   const QString& strServerNameForHTMLStatusFile ) :
-    Socket ( &ChannelSet, this, iPortNumber )
+                   const QString& strServerNameForHTMLStatusFile,
+                   const bool bForceLowUploadRate ) :
+    Socket ( &ChannelSet, this, iPortNumber ),
+    ChannelSet ( bForceLowUploadRate )
 {
     vecsSendData.Init ( MIN_BLOCK_SIZE_SAMPLES );
 
diff --git a/src/server.h b/src/server.h
index a7d4cb08..459fc4aa 100755
--- a/src/server.h
+++ b/src/server.h
@@ -43,7 +43,8 @@ class CServer : public QObject
 public:
     CServer ( const bool bUseLogging, const quint16 iPortNumber,
               const QString& strHTMLStatusFileName,
-              const QString& strServerNameForHTMLStatusFile );
+              const QString& strServerNameForHTMLStatusFile,
+              const bool bForceLowUploadRate );
     virtual ~CServer() {}
 
     void Start();