diff --git a/core/AmSession.cpp b/core/AmSession.cpp
index c4bfdfb7..bc8999e7 100644
--- a/core/AmSession.cpp
+++ b/core/AmSession.cpp
@@ -79,6 +79,7 @@ AmSession::AmSession()
     m_dtmfDetector(this), m_dtmfEventQueue(&m_dtmfDetector),
     m_dtmfDetectionEnabled(true),
     accept_early_session(false),
+    passive_mode(false),
     rtp_interface(-1),
     refresh_method(REFRESH_UPDATE_FB_REINV),
     processing_status(SESSION_PROCESSING_EVENTS),
@@ -292,7 +293,6 @@ void AmSession::negotiate(const string& sdp_body,
     DBG("remote party doesn't support telephone events\n");
   }
 
-  bool passive_mode = false;
   if( sdp.remote_active || force_symmetric_rtp) {
     DBG("The other UA is NATed: switched to passive mode.\n");
     DBG("remote_active = %i; force_symmetric_rtp = %i\n",
diff --git a/core/AmSession.h b/core/AmSession.h
index 81a239e3..e74e37cf 100644
--- a/core/AmSession.h
+++ b/core/AmSession.h
@@ -157,6 +157,9 @@ private:
 
   auto_ptr<AmRtpAudio> _rtp_str;
 
+  /** set up RTP stream as passive? (comedia style NAT aware) */
+  bool passive_mode;
+
   AmDynInvoke* user_timer_ref;
   
   void getUserTimerInstance();