diff --git a/core/plug-in/sipctrl/sip_trans.cpp b/core/plug-in/sipctrl/sip_trans.cpp
index b80f0545..03ba46cd 100644
--- a/core/plug-in/sipctrl/sip_trans.cpp
+++ b/core/plug-in/sipctrl/sip_trans.cpp
@@ -117,7 +117,8 @@ void trans_timer_cb(timer* t, unsigned int bucket_id, sip_trans* tr)
     if(bucket){
 	bucket->lock();
 	if(bucket->exist(tr)){
-	    DBG("Transaction timer expired: type=0x%x, trans=%p\n",t->type,tr);
+	    DBG("Transaction timer expired: type=0x%x, trans=%p, eta=%i, t=%i\n",
+		t->type,tr,t->expires,wheeltimer::instance()->wall_clock);
 	    trans_layer::instance()->timer_expired(t,bucket,tr);
 	}
 	else {
diff --git a/core/plug-in/sipctrl/wheeltimer.cpp b/core/plug-in/sipctrl/wheeltimer.cpp
index 9d0d3936..5ddc6d32 100644
--- a/core/plug-in/sipctrl/wheeltimer.cpp
+++ b/core/plug-in/sipctrl/wheeltimer.cpp
@@ -101,7 +101,7 @@ void wheeltimer::run()
       sdiff.tv_sec = diff.tv_sec;
       sdiff.tv_nsec = diff.tv_usec * 1000;
 
-      if(sdiff.tv_nsec > 2000) // 2 ms 
+      if(sdiff.tv_nsec > 2000000) // 2 ms 
 	nanosleep(&sdiff,&rem);
     }
     //else {
diff --git a/core/plug-in/sipctrl/wheeltimer.h b/core/plug-in/sipctrl/wheeltimer.h
index a6e6e986..36943a0f 100644
--- a/core/plug-in/sipctrl/wheeltimer.h
+++ b/core/plug-in/sipctrl/wheeltimer.h
@@ -123,7 +123,7 @@ public:
     static wheeltimer* instance();
 
     //clock reference
-    u_int32_t wall_clock; // 32 bits
+    volatile u_int32_t wall_clock; // 32 bits
 
     void clock_work();
     void insert_timer(timer* t);