diff --git a/src/knx/address_table_object.h b/src/knx/address_table_object.h
index 138c580..b610036 100644
--- a/src/knx/address_table_object.h
+++ b/src/knx/address_table_object.h
@@ -20,7 +20,6 @@ class AddressTableObject : public TableObject
     AddressTableObject(Memory& memory);
     void readProperty(PropertyID id, uint16_t start, uint8_t& count, uint8_t* data) override;
     uint8_t* restore(uint8_t* buffer) override;
-    ObjectType objectType() override { return OT_ADDR_TABLE; }
 
     /**
      * returns the number of group addresses of the object.
diff --git a/src/knx/application_program_object.h b/src/knx/application_program_object.h
index 444e55d..463f55e 100644
--- a/src/knx/application_program_object.h
+++ b/src/knx/application_program_object.h
@@ -9,7 +9,6 @@ class ApplicationProgramObject : public TableObject
     void readProperty(PropertyID id, uint16_t start, uint8_t& count, uint8_t* data) override;
     void writeProperty(PropertyID id, uint16_t start, uint8_t* data, uint8_t& count) override;
     uint8_t propertySize(PropertyID id) override;
-    ObjectType objectType() override { return OT_APPLICATION_PROG; }    
     uint8_t* data(uint32_t addr);
     uint8_t getByte(uint32_t addr);
     uint16_t getWord(uint32_t addr);
diff --git a/src/knx/association_table_object.h b/src/knx/association_table_object.h
index b13750f..43a6e75 100644
--- a/src/knx/association_table_object.h
+++ b/src/knx/association_table_object.h
@@ -7,7 +7,6 @@ class AssociationTableObject : public TableObject
   public:
     AssociationTableObject(Memory& memory);
     void readProperty(PropertyID id, uint16_t start, uint8_t& count, uint8_t* data) override;
-    ObjectType objectType() override { return OT_ASSOC_TABLE; }
 
     uint8_t* restore(uint8_t* buffer) override;
 
diff --git a/src/knx/bau07B0.cpp b/src/knx/bau07B0.cpp
index 0c2a877..c7e613e 100644
--- a/src/knx/bau07B0.cpp
+++ b/src/knx/bau07B0.cpp
@@ -22,9 +22,7 @@ Bau07B0::Bau07B0(Platform& platform)
 #endif
 
     // Set Mask Version in Device Object depending on the BAU
-    uint16_t maskVersion;
-    popWord(maskVersion, _descriptor);
-    _deviceObj.maskVersion(maskVersion);
+    _deviceObj.maskVersion(0x07B0);
 
     // Set which interface objects are available in the device object
     // This differs from BAU to BAU with different medium types.
@@ -84,11 +82,6 @@ InterfaceObject* Bau07B0::getInterfaceObject(ObjectType objectType, uint8_t obje
     }
 }
 
-uint8_t* Bau07B0::descriptor()
-{
-    return _descriptor;
-}
-
 DataLinkLayer& Bau07B0::dataLinkLayer()
 {
     return _dlLayer;
diff --git a/src/knx/bau07B0.h b/src/knx/bau07B0.h
index d5099e1..17230bc 100644
--- a/src/knx/bau07B0.h
+++ b/src/knx/bau07B0.h
@@ -17,7 +17,6 @@ class Bau07B0 : public BauSystemB
   protected:
     InterfaceObject* getInterfaceObject(uint8_t idx);
     InterfaceObject* getInterfaceObject(ObjectType objectType, uint8_t objectInstance);
-    uint8_t* descriptor();
     DataLinkLayer& dataLinkLayer();
 
   private:
@@ -25,10 +24,7 @@ class Bau07B0 : public BauSystemB
 #ifdef USE_CEMI_SERVER
     CemiServer _cemiServer;
     CemiServerObject _cemiServerObject;
-#endif
 
-    uint8_t _descriptor[2] = {0x07, 0xb0};
-#ifdef USE_CEMI_SERVER
     const uint32_t _ifObjs[7] = { 6, // length
                                   OT_DEVICE, OT_ADDR_TABLE, OT_ASSOC_TABLE, OT_GRP_OBJ_TABLE, OT_APPLICATION_PROG, OT_CEMI_SERVER};
 #else    
diff --git a/src/knx/bau27B0.cpp b/src/knx/bau27B0.cpp
index 4f2d753..3366c2e 100644
--- a/src/knx/bau27B0.cpp
+++ b/src/knx/bau27B0.cpp
@@ -1,6 +1,5 @@
-#if MEDIUM_TYPE == 2
-
 #include "bau27B0.h"
+#ifdef USE_RF
 #include "bits.h"
 #include <string.h>
 #include <stdio.h>
@@ -23,9 +22,7 @@ Bau27B0::Bau27B0(Platform& platform)
 #endif
 
     // Set Mask Version in Device Object depending on the BAU
-    uint16_t maskVersion;
-    popWord(maskVersion, _descriptor);
-    _deviceObj.maskVersion(maskVersion);
+    _deviceObj.maskVersion(0x27B0);
 
     // Set the maximum APDU length
     // ETS will consider this value while programming the device
@@ -97,11 +94,6 @@ InterfaceObject* Bau27B0::getInterfaceObject(ObjectType objectType, uint8_t obje
     }
 }
 
-uint8_t* Bau27B0::descriptor()
-{
-    return _descriptor;
-}
-
 DataLinkLayer& Bau27B0::dataLinkLayer()
 {
     return _dlLayer;
diff --git a/src/knx/bau27B0.h b/src/knx/bau27B0.h
index d76d329..16824eb 100644
--- a/src/knx/bau27B0.h
+++ b/src/knx/bau27B0.h
@@ -18,7 +18,6 @@ class Bau27B0 : public BauSystemB
   protected:
     InterfaceObject* getInterfaceObject(uint8_t idx);
     InterfaceObject* getInterfaceObject(ObjectType objectType, uint8_t objectInstance);
-    uint8_t* descriptor();
     DataLinkLayer& dataLinkLayer();
 
   private:
@@ -27,10 +26,6 @@ class Bau27B0 : public BauSystemB
 #ifdef USE_CEMI_SERVER
     CemiServer _cemiServer;
     CemiServerObject _cemiServerObject;
-#endif
-
-    uint8_t _descriptor[2] = {0x27, 0xB0};
-#ifdef USE_CEMI_SERVER
     const uint32_t _ifObjs[8] = { 7, // length
                                   OT_DEVICE, OT_ADDR_TABLE, OT_ASSOC_TABLE, OT_GRP_OBJ_TABLE, OT_APPLICATION_PROG, OT_RF_MEDIUM, OT_CEMI_SERVER};
 #else    
diff --git a/src/knx/bau57B0.cpp b/src/knx/bau57B0.cpp
index 1165e53..65bd06e 100644
--- a/src/knx/bau57B0.cpp
+++ b/src/knx/bau57B0.cpp
@@ -26,9 +26,7 @@ Bau57B0::Bau57B0(Platform& platform)
     _memory.addSaveRestore(&_ipParameters);
 
     // Set Mask Version in Device Object depending on the BAU
-    uint16_t maskVersion;
-    popWord(maskVersion, _descriptor);
-    _deviceObj.maskVersion(maskVersion);
+    _deviceObj.maskVersion(0x57B0);
 
     // Set which interface objects are available in the device object
     // This differs from BAU to BAU with different medium types.
@@ -84,11 +82,6 @@ InterfaceObject* Bau57B0::getInterfaceObject(ObjectType objectType, uint8_t obje
     }
 }
 
-uint8_t* Bau57B0::descriptor()
-{
-    return _descriptor;
-}
-
 DataLinkLayer& Bau57B0::dataLinkLayer()
 {
     return _dlLayer;
diff --git a/src/knx/bau57B0.h b/src/knx/bau57B0.h
index 635ccbc..300b185 100644
--- a/src/knx/bau57B0.h
+++ b/src/knx/bau57B0.h
@@ -15,7 +15,6 @@ class Bau57B0 : public BauSystemB
   protected:
     InterfaceObject* getInterfaceObject(uint8_t idx);
     InterfaceObject* getInterfaceObject(ObjectType objectType, uint8_t objectInstance);
-    uint8_t* descriptor();
     DataLinkLayer& dataLinkLayer();
 
   private:
@@ -24,9 +23,12 @@ class Bau57B0 : public BauSystemB
 #ifdef USE_CEMI_SERVER
     CemiServer _cemiServer;
     CemiServerObject _cemiServerObject;
+
+    const uint32_t _ifObjs[8] = { 8, // length
+                                 OT_DEVICE, OT_ADDR_TABLE, OT_ASSOC_TABLE, OT_GRP_OBJ_TABLE, OT_APPLICATION_PROG, OT_IP_PARAMETER, OT_CEMI_SERVER};
+#else
+    const uint32_t _ifObjs[7] = {7, // length
+                                 OT_DEVICE, OT_ADDR_TABLE, OT_ASSOC_TABLE, OT_GRP_OBJ_TABLE, OT_APPLICATION_PROG, OT_IP_PARAMETER};
 #endif
-    uint8_t _descriptor[2] = {0x57, 0xb0};
-    const uint32_t _ifObjs[7] = { 6, // length
-                                  OT_DEVICE, OT_ADDR_TABLE, OT_ASSOC_TABLE, OT_GRP_OBJ_TABLE, OT_APPLICATION_PROG, OT_IP_PARAMETER};
 };
 #endif
\ No newline at end of file
diff --git a/src/knx/bau_systemB.cpp b/src/knx/bau_systemB.cpp
index 321529d..7cfc22e 100644
--- a/src/knx/bau_systemB.cpp
+++ b/src/knx/bau_systemB.cpp
@@ -142,8 +142,10 @@ void BauSystemB::deviceDescriptorReadIndication(Priority priority, HopCountType
 {
     if (descriptorType != 0)
         descriptorType = 0x3f;
-
-    _appLayer.deviceDescriptorReadResponse(AckRequested, priority, hopType, asap, descriptorType, descriptor());
+    
+    uint8_t data[2];
+    pushWord(_deviceObj.maskVersion(), data);
+    _appLayer.deviceDescriptorReadResponse(AckRequested, priority, hopType, asap, descriptorType, data);
 }
 
 void BauSystemB::memoryWriteIndication(Priority priority, HopCountType hopType, uint16_t asap, uint8_t number,
diff --git a/src/knx/bau_systemB.h b/src/knx/bau_systemB.h
index 50d51cc..b651150 100644
--- a/src/knx/bau_systemB.h
+++ b/src/knx/bau_systemB.h
@@ -40,7 +40,6 @@ class BauSystemB : protected BusAccessUnit
 
   protected:
     virtual DataLinkLayer& dataLinkLayer() = 0;
-    virtual uint8_t* descriptor() = 0;
     void memoryWriteIndication(Priority priority, HopCountType hopType, uint16_t asap, uint8_t number,
                                uint16_t memoryAddress, uint8_t* data) override;
     void memoryReadIndication(Priority priority, HopCountType hopType, uint16_t asap, uint8_t number,
diff --git a/src/knx/cemi_server_object.h b/src/knx/cemi_server_object.h
index d0dc764..82a5e21 100644
--- a/src/knx/cemi_server_object.h
+++ b/src/knx/cemi_server_object.h
@@ -13,7 +13,6 @@ public:
     uint8_t propertySize(PropertyID id) override;
     uint8_t* save(uint8_t* buffer) override;
     uint8_t* restore(uint8_t* buffer) override;
-    ObjectType objectType() override { return OT_CEMI_SERVER; }
 
 protected:
   uint8_t propertyDescriptionCount() override;
diff --git a/src/knx/device_object.h b/src/knx/device_object.h
index b3aecc1..c80f047 100644
--- a/src/knx/device_object.h
+++ b/src/knx/device_object.h
@@ -14,7 +14,6 @@ public:
     uint8_t* restore(uint8_t* buffer) override;
     uint16_t saveSize() override;
     void readPropertyDescription(uint8_t propertyId, uint8_t& propertyIndex, bool& writeEnable, uint8_t& type, uint16_t& numberOfElements, uint8_t& access);
-    ObjectType objectType() override { return OT_DEVICE; }
 
     uint16_t induvidualAddress();
     void induvidualAddress(uint16_t value);
diff --git a/src/knx/group_object_table_object.h b/src/knx/group_object_table_object.h
index 6155bd4..127dba7 100644
--- a/src/knx/group_object_table_object.h
+++ b/src/knx/group_object_table_object.h
@@ -11,7 +11,6 @@ class GroupObjectTableObject : public TableObject
     GroupObjectTableObject(Memory& memory);
     virtual ~GroupObjectTableObject();
     void readProperty(PropertyID id, uint16_t start, uint8_t& count, uint8_t* data) override;
-    ObjectType objectType() override { return OT_GRP_OBJ_TABLE; }
     uint16_t entryCount();
     GroupObject& get(uint16_t asap);
     GroupObject& nextUpdatedObject(bool& valid);
diff --git a/src/knx/interface_object.h b/src/knx/interface_object.h
index f3f2507..40a28e7 100644
--- a/src/knx/interface_object.h
+++ b/src/knx/interface_object.h
@@ -119,12 +119,6 @@ class InterfaceObject : public SaveRestore
     // TODO: remove first version after complete property refactoring
     void readPropertyDescription(uint8_t& propertyId, uint8_t& propertyIndex, bool& writeEnable, uint8_t& type, uint16_t& numberOfElements, uint8_t& access);
     void readPropertyDescription2(uint8_t& propertyId, uint8_t& propertyIndex, bool& writeEnable, uint8_t& type, uint16_t& numberOfElements, uint8_t& access);
-    /**
-     * Gets object type.
-     * 
-     * @returns object type
-     */
-    virtual ObjectType objectType() = 0;
 
     /**
      * Gets property with PropertyID id if it exists and nullptr otherwise.
diff --git a/src/knx/ip_parameter_object.h b/src/knx/ip_parameter_object.h
index 7cd53ab..17f527a 100644
--- a/src/knx/ip_parameter_object.h
+++ b/src/knx/ip_parameter_object.h
@@ -10,12 +10,6 @@ class IpParameterObject : public InterfaceObject
 {
   public:
     IpParameterObject(DeviceObject& deviceObject, Platform& platform);
-
-    ObjectType objectType() override
-    {
-        return OT_IP_PARAMETER;
-    }
-
     uint32_t multicastAddress() const;
     uint8_t ttl() const;
 
diff --git a/src/knx/rf_medium_object.h b/src/knx/rf_medium_object.h
index 6611862..a2a22e9 100644
--- a/src/knx/rf_medium_object.h
+++ b/src/knx/rf_medium_object.h
@@ -13,7 +13,6 @@ public:
     uint8_t* save(uint8_t* buffer) override;
     uint8_t* restore(uint8_t* buffer) override;
     uint16_t saveSize() override;
-    ObjectType objectType() override { return OT_RF_MEDIUM; }
 
     uint8_t* rfDomainAddress();
     void rfDomainAddress(uint8_t* value);