diff --git a/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs b/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
index 94a856b84d..4ba11acb93 100644
--- a/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/InstantMessage/MessageTransferModule.cs
@@ -647,5 +647,12 @@ namespace OpenSim.Region.CoreModules.Avatar.InstantMessage
             return gim;
         }
 
+        public void RegisterMessageFilter(Byte dialog, bool always, MessageFilterDelegate fn)
+        {
+        }
+
+        public void DeregisterMessageFilter(Byte dialog, MessageFilterDelegate fn)
+        {
+        }
     }
 }
diff --git a/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs b/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
index 40c224d4d0..51ac37cc10 100644
--- a/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
+++ b/OpenSim/Region/Framework/Interfaces/IMessageTransferModule.cs
@@ -25,14 +25,19 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+using System;
 using OpenSim.Framework;
 
 namespace OpenSim.Region.Framework.Interfaces
 {
     public delegate void MessageResultNotification(bool success);
-   
+    public delegate bool MessageFilterDelegate(GridInstantMessage im);
+    
     public interface IMessageTransferModule
     {
         void SendInstantMessage(GridInstantMessage im, MessageResultNotification result);
+
+        void RegisterMessageFilter(Byte dialog, bool always, MessageFilterDelegate fn);
+        void DeregisterMessageFilter(Byte dialog, MessageFilterDelegate fn);
     }
 }