diff --git a/core/AmSession.cpp b/core/AmSession.cpp
index 3bcf5826..dfbc1def 100644
--- a/core/AmSession.cpp
+++ b/core/AmSession.cpp
@@ -804,6 +804,17 @@ void AmSession::onInvite2xx(const AmSipReply& reply)
   if(t) dlg.send_200_ack(*t);
 }
 
+void AmSession::onNo2xxACK(unsigned int cseq)
+{
+  dlg.bye();
+  setStopped();
+}
+
+void AmSession::onNoErrorACK(unsigned int cseq)
+{
+  setStopped();
+}
+
 void AmSession::onAudioEvent(AmAudioEvent* audio_ev)
 {
   if (audio_ev->event_id == AmAudioEvent::cleared)
diff --git a/core/AmSession.h b/core/AmSession.h
index 7463f1eb..f143185d 100644
--- a/core/AmSession.h
+++ b/core/AmSession.h
@@ -467,6 +467,11 @@ public:
 
   /** 2xx reply has been received for an INVITE transaction */
   virtual void onInvite2xx(const AmSipReply& reply);
+  
+  /** missing 2xx-ACK */
+  virtual void onNo2xxACK(unsigned int cseq);
+  /** missing non-2xx-ACK */
+  virtual void onNoErrorACK(unsigned int cseq);
 
   /**
    * Entry point for Audio events
diff --git a/core/AmSipDialog.cpp b/core/AmSipDialog.cpp
index acb79a7b..c7070ee1 100644
--- a/core/AmSipDialog.cpp
+++ b/core/AmSipDialog.cpp
@@ -300,13 +300,13 @@ void AmSipDialog::uasTimeout(AmSipTimeoutEvent* to_ev)
 
   switch(to_ev->type){
   case AmSipTimeoutEvent::no2xxACK:
-    //TODO
-    DBG("Timeout: missing 2xx-ACK received\n");
+    DBG("Timeout: missing 2xx-ACK\n");
+    if(hdl) hdl->onNo2xxACK(to_ev->cseq);
     break;
 
   case AmSipTimeoutEvent::noErrorACK:
-    //TODO
     DBG("Timeout: missing non-2xx-ACK\n");
+    if(hdl) hdl->onNoErrorACK(to_ev->cseq);
     break;
 
   case AmSipTimeoutEvent::noPRACK:
diff --git a/core/AmSipDialog.h b/core/AmSipDialog.h
index 16ef5f75..f4c29900 100644
--- a/core/AmSipDialog.h
+++ b/core/AmSipDialog.h
@@ -96,6 +96,12 @@ class AmSipDialogEventHandler
   /** Hook called when a local INVITE request has been replied with 2xx */
   virtual void onInvite2xx(const AmSipReply& reply)=0;
 
+  /** Hook called when a UAS INVITE transaction did not receive a 2xx-ACK */
+  virtual void onNo2xxACK(unsigned int cseq)=0;
+
+  /** Hook called when a UAS INVITE transaction did not receive a non-2xx-ACK */
+  virtual void onNoErrorACK(unsigned int cseq)=0;
+
   virtual ~AmSipDialogEventHandler() {};
 };
 
diff --git a/core/AmSipEvent.h b/core/AmSipEvent.h
index 7da2c9a2..8b2ec4d3 100644
--- a/core/AmSipEvent.h
+++ b/core/AmSipEvent.h
@@ -62,10 +62,9 @@ class AmSipTimeoutEvent: public AmSipEvent
 
   EvType       type;
 
-  unsigned int cseq_num;
-  string       cseq_method;
+  unsigned int cseq;
 
-  AmSipTimeoutEvent(EvType t, unsigned int cseq_num, const string& cseq_method)
+  AmSipTimeoutEvent(EvType t, unsigned int cseq_num)
     : AmSipEvent(), type(t)
    {}
 
diff --git a/core/SipCtrlInterface.cpp b/core/SipCtrlInterface.cpp
index f7f3e27a..9136f1d5 100644
--- a/core/SipCtrlInterface.cpp
+++ b/core/SipCtrlInterface.cpp
@@ -493,6 +493,8 @@ void SipCtrlInterface::timer_expired(sip_trans* trans, sip_timer_type tt)
 
     AmSipTimeoutEvent::EvType ev = AmSipTimeoutEvent::_noEv;
 
+    DBG("tt=%i;state=%i\n",tt,trans->state);
+
     //TODO: send an event to the SIP Dialog
     switch(tt){
 	
@@ -511,6 +513,8 @@ void SipCtrlInterface::timer_expired(sip_trans* trans, sip_timer_type tt)
 	    ERROR("timer H expired / transaction in undefined state\n");
 	    return;
 	}
+	break;
+
     default:
 	return;
     }
@@ -527,7 +531,7 @@ void SipCtrlInterface::timer_expired(sip_trans* trans, sip_timer_type tt)
     }
  
     AmEventDispatcher::instance()->post(c2stlstr(trans->to_tag),
-					new AmSipTimeoutEvent(ev, cseq->num, c2stlstr(cseq->method_str)));
+					new AmSipTimeoutEvent(ev, cseq->num));
 }
 
 void SipCtrlInterface::prepare_routes_uac(const list<sip_header*>& routes, string& route_field)