diff --git a/src/sip/twitter/twitter.cpp b/src/sip/twitter/twitter.cpp
index c5e8db714..22087ee7b 100644
--- a/src/sip/twitter/twitter.cpp
+++ b/src/sip/twitter/twitter.cpp
@@ -393,8 +393,9 @@ TwitterPlugin::registerOffer( const QString &screenName, const QHash< QString, Q
         _peerData["ohst"] = QVariant::fromValue< QString >( Servent::instance()->externalAddress() );
         _peerData["oprt"] = QVariant::fromValue< int >( Servent::instance()->externalPort() );
         m_cachedPeers[screenName] = QVariant::fromValue< QHash< QString, QVariant > >( _peerData );
-        peersChanged = true;        
-        QMetaObject::invokeMethod( this, "sendOffer", Q_ARG( QString, screenName ), QGenericArgument( "QHash< QString, QVariant >", (const void*)&_peerData ) );
+        peersChanged = true;
+        if( !Servent::instance()->externalAddress().isEmpty() && !Servent::instance()->externalPort() == 0 )
+            QMetaObject::invokeMethod( this, "sendOffer", Q_ARG( QString, screenName ), QGenericArgument( "QHash< QString, QVariant >", (const void*)&_peerData ) );
     }
 
     if ( m_isOnline && _peerData.contains( "host" ) && _peerData.contains( "port" ) && _peerData.contains( "pkey" ) )