diff --git a/src/channel.cpp b/src/channel.cpp
index 92938102..3db4807d 100755
--- a/src/channel.cpp
+++ b/src/channel.cpp
@@ -345,13 +345,9 @@ void CChannel::OnNetTranspPropsReceived ( CNetworkTransportProps NetworkTranspor
     // only the server shall act on network transport properties message
     if ( bIsServer )
     {
-// #### COMPATIBILITY OLD VERSION, TO BE REMOVED ####
-        // if old CELT codec is used, inform the client that the new OPUS codec
-        // is required since we refuse the complete network transport properties
-        // if the audio coding type is set to CELT
+        // OPUS codec is the only supported codec right now
         if ( NetworkTransportProps.eAudioCodingType != CT_OPUS )
         {
-            Protocol.CreateOpusSupportedMes();
             return;
         }
 
@@ -361,8 +357,7 @@ void CChannel::OnNetTranspPropsReceived ( CNetworkTransportProps NetworkTranspor
             eAudioCompressionType = NetworkTransportProps.eAudioCodingType;
             iNumAudioChannels     = NetworkTransportProps.iNumAudioChannels;
             iNetwFrameSizeFact    = NetworkTransportProps.iBlockSizeFact;
-            iNetwFrameSize =
-                NetworkTransportProps.iBaseNetworkPacketSize;
+            iNetwFrameSize        = NetworkTransportProps.iBaseNetworkPacketSize;
 
             MutexSocketBuf.lock();
             {
diff --git a/src/protocol.cpp b/src/protocol.cpp
index bbf1639c..5b834fc3 100755
--- a/src/protocol.cpp
+++ b/src/protocol.cpp
@@ -154,12 +154,6 @@ MESSAGES (with connection)
     +---------------------+
 
 
-// #### COMPATIBILITY OLD VERSION, TO BE REMOVED ####
-- PROTMESSID_OPUS_SUPPORTED: Informs that OPUS codec is supported
-
-    note: does not have any data -> n = 0
-
-
 CONNECTION LESS MESSAGES
 ------------------------
 
@@ -1227,12 +1221,6 @@ bool CProtocol::EvaluateLicenceRequiredMes ( const CVector<uint8_t>& vecData )
     return false; // no error
 }
 
-void CProtocol::CreateOpusSupportedMes()
-{
-    CreateAndSendMessage ( PROTMESSID_OPUS_SUPPORTED,
-                           CVector<uint8_t> ( 0 ) );
-}
-
 
 // Connection less messages ----------------------------------------------------
 void CProtocol::CreateCLPingMes ( const CHostAddress& InetAddr, const int iMs )
diff --git a/src/protocol.h b/src/protocol.h
index 20c93e10..23a5b134 100755
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -53,7 +53,7 @@
 #define PROTMESSID_REQ_CHANNEL_INFOS          23 // request channel infos for fader tag
 #define PROTMESSID_CONN_CLIENTS_LIST          24 // channel infos for connected clients
 #define PROTMESSID_CHANNEL_INFOS              25 // set channel infos
-#define PROTMESSID_OPUS_SUPPORTED             26 // tells that OPUS codec is supported
+#define PROTMESSID_OPUS_SUPPORTED             26 // OLD (not used anymore)
 #define PROTMESSID_LICENCE_REQUIRED           27 // licence required
 
 // message IDs of connection less messages (CLM)
@@ -102,7 +102,6 @@ public:
     void CreateNetwTranspPropsMes ( const CNetworkTransportProps& NetTrProps );
     void CreateReqNetwTranspPropsMes();
     void CreateLicenceRequiredMes ( const ELicenceType eLicenceType );
-    void CreateOpusSupportedMes();
 
     void CreateCLPingMes               ( const CHostAddress& InetAddr, const int iMs );
     void CreateCLPingWithNumClientsMes ( const CHostAddress& InetAddr,
diff --git a/src/testbench.h b/src/testbench.h
index b3905f8d..e13b3435 100755
--- a/src/testbench.h
+++ b/src/testbench.h
@@ -181,10 +181,6 @@ public slots:
             Protocol.CreateReqNetwTranspPropsMes();
             break;
 
-        case 13: // PROTMESSID_OPUS_SUPPORTED
-            Protocol.CreateOpusSupportedMes();
-            break;
-
         case 14: // PROTMESSID_CLM_PING_MS
             Protocol.CreateCLPingMes ( CurHostAddress,
                                        GenRandomIntInRange ( -2, 1000 ) );