diff -r 000000000000 -r 1bce908db942 natplugins/natptraversalcontroller/src/cnatbindingstunrefresher.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/natplugins/natptraversalcontroller/src/cnatbindingstunrefresher.cpp	Tue Feb 02 01:04:58 2010 +0200
@@ -0,0 +1,109 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+
+#include <e32math.h>
+#include "natfwstunbinding.h"
+#include "cnatbindingstunrefresher.h"
+#include "cnatbinding.h"
+
+const TInt KRefreshBaseValue = 900000; // microseconds
+const TInt KRefreshVariationRange = 200000; // microseconds
+
+// -----------------------------------------------------------------------------
+// CNATBindingSTUNRefresher::CNATBindingSTUNRefresher
+// -----------------------------------------------------------------------------
+//
+CNATBindingSTUNRefresher::CNATBindingSTUNRefresher(
+    CDeltaTimer& aDeltaTimer,
+    TInt aRefreshInterval,
+    MNATBindingRefresherObserver& aObserver,
+    CNATBinding& aNATBinding)
+    : CNATBindingRefresher(aDeltaTimer,aObserver),
+      iNATBinding(aNATBinding),
+      iRefreshInterval(aRefreshInterval)
+    {
+    TTime time;
+    time.HomeTime();
+    iRandomSeed = time.Int64();
+    }
+
+// -----------------------------------------------------------------------------
+// CNATBindingSTUNRefresher::~CNATBindingSTUNRefresher
+// -----------------------------------------------------------------------------
+//
+CNATBindingSTUNRefresher::~CNATBindingSTUNRefresher()
+    {
+    CSTUNBinding* stunBinding = iNATBinding.Binding();
+    if (stunBinding)
+        {
+        stunBinding->CancelRequest();
+        }
+    }
+
+// -----------------------------------------------------------------------------
+// CNATBindingSTUNRefresher::HasSocket
+// -----------------------------------------------------------------------------
+//
+TBool CNATBindingSTUNRefresher::HasSocket(const RSocket& aSocket) const
+    {
+    CSTUNBinding* stunBinding = iNATBinding.Binding();
+    return stunBinding &&
+           (aSocket.SubSessionHandle() ==
+            stunBinding->Socket().SubSessionHandle());
+    }
+
+// -----------------------------------------------------------------------------
+// CNATBindingSTUNRefresher::RefreshInterval
+// -----------------------------------------------------------------------------
+//
+TInt CNATBindingSTUNRefresher::RefreshInterval()
+    {
+    TInt interval = KErrUnderflow;
+    if (iRefreshInterval > 0)
+        {
+        const TInt minValue = iRefreshInterval*KRefreshBaseValue;
+        const TInt variantPart = iRefreshInterval*KRefreshVariationRange;
+        const TInt rand = Math::Rand(iRandomSeed);
+        interval = (minValue+(rand%variantPart));
+        }
+    return interval;
+    }
+
+// -----------------------------------------------------------------------------
+// CNATBindingSTUNRefresher::RefreshTimerExpiredL
+// -----------------------------------------------------------------------------
+//
+void CNATBindingSTUNRefresher::RefreshTimerExpiredL()
+    {
+    __ASSERT_ALWAYS(iNATBinding.Binding(), User::Leave(KErrNotFound));
+
+    iNATBinding.SendSTUNRequestL();
+    }
+
+// -----------------------------------------------------------------------------
+// CNATBindingSTUNRefresher::CancelRefresh
+// -----------------------------------------------------------------------------
+//
+void CNATBindingSTUNRefresher::CancelRefresh()
+    {
+    CSTUNBinding* stunBinding = iNATBinding.Binding();
+    if (stunBinding)
+        {
+        stunBinding->CancelRequest();
+        }
+    }