diff --git a/modules/qrouting/qr_acc.c b/modules/qrouting/qr_acc.c
index c0c0ab4f03..597fa9c933 100644
--- a/modules/qrouting/qr_acc.c
+++ b/modules/qrouting/qr_acc.c
@@ -3,31 +3,64 @@
 extern qr_rule_t * qr_rules_start;
 int myn = 0;
 
-int test_acc(struct sip_msg* msg) {
-	qr_gw_t  *gw = qr_rules_start->dest->dst.gw;
-	struct timespec  cur_time;
-	int_str invite_time;
-	/* register callback for the responses to this INVITE */
-	if(tmb.register_tmcb(msg, 0,TMCB_RESPONSE_IN, qr_check_reply_tmcb,
-				(void*)gw, 0) <= 0) {
-		LM_ERR("cannot register TMCB_RESPONSE_IN\n");
+static void free_timespec(void * to_free) {
+	shm_free((struct timespec*)to_free);
+}
+
+static inline int init_trans_prop(qr_trans_prop_t * trans_prop) {
+	memset(trans_prop, 0, sizeof(qr_trans_prop_t));
+
+	trans_prop->prop_lock
+		= (gen_lock_t*)lock_alloc();
+	if (!lock_init(trans_prop->prop_lock)) {
+		LM_ERR("failed to init lock\n");
 		return -1;
 	}
 
+	return 0;
+
+}
+
+static void release_trans_prop(void *param) {
+	qr_trans_prop_t * to_free;
+
+	to_free = (qr_trans_prop_t *)param;
+	if(to_free->invite) {
+		shm_free(to_free->invite);
+	}
+	if(to_free->prop_lock) {
+		lock_destroy(to_free->prop_lock);
+		lock_dealloc(to_free->prop_lock);
+	}
+	shm_free(to_free);
+}
+
+int test_acc(struct sip_msg* msg) {
+	qr_gw_t  *gw = qr_rules_start->dest->dst.gw;
+	struct timespec  *cur_time = (struct timespec *)shm_malloc(
+			sizeof(struct timespec));
+	qr_trans_prop_t *trans_prop = (qr_trans_prop_t*)shm_malloc(
+			sizeof(qr_trans_prop_t));
+	init_trans_prop(trans_prop);
+
 	/* get the time of INVITE */
-	if(clock_gettime(CLOCK_REALTIME, &cur_time) < 0) {
+	if(clock_gettime(CLOCK_REALTIME, cur_time) < 0) {
 		LM_ERR("failed to get system time\n");
 		return -1;
 	}
 
-	invite_time.s.s = (char*)&cur_time;
-	invite_time.s.len = sizeof(struct timespec);
+	/* save transaction properties */
+	trans_prop->invite = cur_time;
+	trans_prop->gw = gw;
 
-	/* save the pointer to the time structure in an avp */
-	if(add_avp(AVP_VAL_STR, avp_invite_time_pdd, invite_time) < 0) {
-		LM_ERR("failed to attach avp (time of invite) to transaction\n");
+	dlgcb.create_dlg(msg, 0); /* for call duration */
+	/* register callback for the responses to this INVITE */
+	if(tmb.register_tmcb(msg, 0,TMCB_RESPONSE_IN, qr_check_reply_tmcb,
+				(void*)trans_prop, release_trans_prop) <= 0) {
+		LM_ERR("cannot register TMCB_RESPONSE_IN\n");
 		return -1;
 	}
+
 	return 1;
 }
 
@@ -47,10 +80,12 @@ inline void qr_add_4xx(qr_gw_t * gw) {
 }
 
 /*
- * returns the elapsed time in miliseconds from
- * a given moment specified by time_t
+ * returns the elapsed time from
+ * a given moment specified by time_t.
+ * -if mu = 's' it returnes the time in seconds
+ * -if mu = 'm' it returnes the time in miliseconds
  */
-double get_elapsed_time(struct timespec * start) {
+static double get_elapsed_time(struct timespec * start, char mu) {
 	struct timespec now;
 	double seconds, elapsed = 0, milisec_start, milisec_now;
 
@@ -60,58 +95,93 @@ double get_elapsed_time(struct timespec * start) {
 	}
 
 	seconds = difftime(now.tv_sec, start->tv_sec); /* seconds elapsed betwen
-											now and the initial invite */
+													  now and the initial invite */
 	if(seconds < 0) {
 		LM_ERR("negative time elapsed from INVITE\n");
 		return -1;
 	}
-	/* compute the difference in 100miliseconds */
-	elapsed += (seconds * 1000);
-	milisec_start = start->tv_nsec/1000000;
-	milisec_now = now.tv_nsec/1000000;
-	elapsed += (milisec_now - milisec_start);
+	if(mu == 'm') {
+		/* compute the difference in miliseconds */
+		elapsed += (seconds * 1000);
+		milisec_start = start->tv_nsec/1000000;
+		milisec_now = now.tv_nsec/1000000;
+		elapsed += (milisec_now - milisec_start);
+		return elapsed;
+	} else if(mu == 's') {
+		/* return seconds elapsed */
+		return seconds;
+	}
 
-	return elapsed;
+	return -1;
 }
 
 /*
  * checks the response to an INVITE  and does accounting accordingly
  */
 void qr_check_reply_tmcb(struct cell *cell, int type, struct tmcb_params *ps) {
-	int_str time_of_invite;
-	double pdd_tm;
-	qr_gw_t *gw = (qr_gw_t*)ps->param;
+	double pdd_tm = 0;
+	qr_trans_prop_t *trans_prop = (qr_trans_prop_t*)*ps->param;
+	struct dlg_cell *cur_dlg; /* for accouting call time */
+	struct timespec *time_200OK;
 
-	if(gw == NULL)
+	if(trans_prop == NULL)
 		return;
 
-	if(ps->code == 180 || ps->code == 183) { /* Ringing */
-		if(search_first_avp(AVP_VAL_STR, avp_invite_time_pdd, &time_of_invite,
-					NULL) < 0) {
-			LM_ERR("failed to find the avp containing the time of invite "\
-					"maybe it is not the first 18X response\n");
-		} else if(time_of_invite.s.s != 0) {
+	if(ps->code == 180 || ps->code == 183) { /* Ringing - provisional response */
+		lock_get(trans_prop->prop_lock);
+		if(!(trans_prop->state & QR_TM_100RCVD)) {
+			trans_prop->state |= QR_TM_100RCVD; /* mark the rcv of the first
+												   1XX provisional reponse */
+			lock_release(trans_prop->prop_lock);
 			if(( pdd_tm =
 						get_elapsed_time(
-								(struct timespec*)time_of_invite.s.s))
+							(struct timespec*)trans_prop->invite, 'm'))
 					< 0) {
 				return; /* TODO: smth smarter? */
 			}
-
+		} else {
+			lock_release(trans_prop->prop_lock);
 		}
+
 	} else if(ps->code >= 200 && ps->code<500) { /* completed calls */
-		if(ps->code == 200) {
-			qr_add_200OK(qr_rules_start->dest[0].dst.gw);
+		if(ps->code == 200) { /* calee answered */
+			qr_add_200OK(trans_prop->gw);
+			time_200OK = shm_malloc(sizeof(struct timeval));
+
+
+			if(clock_gettime(CLOCK_REALTIME, time_200OK) < 0) {
+				LM_ERR("failed to get system time\n");
+				return ;
+			}
+
+			if((cur_dlg = dlgcb.get_dlg()) < 0) {
+				LM_ERR("failed to create dialog\n");
+				return ; /* TODO: goto accouting */
+			}
+			if(dlgcb.register_dlgcb(cur_dlg, DLGCB_TERMINATED, (void*)call_ended,
+						(void*)time_200OK, free_timespec) != 0) {
+				LM_ERR("failed to register callback for call termination\n");
+			}
 		} else if (ps->code != 408 || (ps->code == 408 && (cell->flags &
 						T_UAC_HAS_RECV_REPLY) )){ /* if it's 408 it must have
 													 one provisional response */
-			qr_add_4xx(gw);
+			qr_add_4xx(trans_prop->gw);
 		}
 	} else if(ps->code >= 500) { /* 1XX should not be accounted -
 									provisional responses */
-		lock_get(gw->acc_lock);
-		++(qr_rules_start->dest[0].dst.gw->current_interval.n.ok);
-		lock_release(gw->acc_lock);
+		lock_get(trans_prop->gw->acc_lock);
+		++(trans_prop->gw->current_interval.n.ok);
+		lock_release(trans_prop->gw->acc_lock);
+	}
+}
+
+void call_ended(struct dlg_cell* dlg, int type,
+		struct dlg_cb_params * params) {
+	double cd;
+	struct timespec *time_200OK = (struct timespec*)*params->param;
+	if((cd = get_elapsed_time(time_200OK,'s')) < 0) {
+		return;
 	}
+	LM_DBG("call duration = %lf", cd);
 }
 
diff --git a/modules/qrouting/qr_acc.h b/modules/qrouting/qr_acc.h
index 178ee657d4..62162ae45f 100644
--- a/modules/qrouting/qr_acc.h
+++ b/modules/qrouting/qr_acc.h
@@ -4,15 +4,28 @@
 #include <time.h>
 
 #include "../tm/tm_load.h"
+#include "../dialog/dlg_load.h"
 #include "qr_stats.h"
 
+#define QR_TM_100RCVD (1<<0)
+
 struct tm_binds tmb;
-int avp_invite_time_pdd; /* AVP for storing the time of the INVITE */
+struct dlg_binds dlgcb;
+struct dlg * dlg_cell;
+
+typedef struct qr_trans_prop {
+	qr_gw_t *gw;
+	gen_lock_t *prop_lock;
+	struct timespec *invite;
+	char state;
+} qr_trans_prop_t;
 
 
 int test_acc(struct sip_msg*);
 inline void qr_add_200OK(qr_gw_t * gw);
 inline void qr_add_4xx(qr_gw_t*);
 void qr_check_reply_tmcb(struct cell*, int ,struct tmcb_params*);
+void call_ended(struct dlg_cell* dlg, int type,
+		struct dlg_cb_params * params);
 
 #endif
diff --git a/modules/qrouting/qrouting.c b/modules/qrouting/qrouting.c
index 8dfa1e9322..883778b907 100644
--- a/modules/qrouting/qrouting.c
+++ b/modules/qrouting/qrouting.c
@@ -99,7 +99,12 @@ static int qr_init(void){
 												intervals in history */
 
 	if(load_tm_api(&tmb) == -1) {
-		LM_ERR("failed to load tm functions\n");
+		LM_ERR("failed to load tm functions. Tm module loaded?\n");
+		return -1;
+	}
+	if(load_dlg_api(&dlgcb) == -1) {
+		LM_ERR("failed to load dlg functions. Dialog module loaded?\n");
+		return -1;
 	}
 
 	/* FIXME:testing purpose */
@@ -107,13 +112,6 @@ static int qr_init(void){
 	qr_add_rule(my_rule);
 	qr_rules_start->dest[0].dst.gw = qr_create_gw();
 
-	/* AVP for storing the time when the INVITE was recvd
-	 * for computing PDD*/
-	if(parse_avp_spec(&avp_invite_time_name_pdd, &avp_invite_time_pdd) < 0) {
-		LM_ERR("failed to get avp id\n");
-		return -1;
-	}
-
 	return 0;
 }