diff --git a/src/switch_jitterbuffer.c b/src/switch_jitterbuffer.c
index ec0123d2b5..9481d456ad 100644
--- a/src/switch_jitterbuffer.c
+++ b/src/switch_jitterbuffer.c
@@ -402,6 +402,26 @@ static inline uint32_t jb_find_highest_ts(switch_jb_t *jb)
 }
 #endif
 
+
+static inline switch_jb_node_t *jb_find_penultimate_node(switch_jb_t *jb)
+{
+	switch_jb_node_t *np, *highest = NULL, *second_highest = NULL;
+
+	switch_mutex_lock(jb->list_mutex);
+	for (np = jb->node_list; np; np = np->next) {
+		if (!np->visible) continue;
+
+		if (!highest || ntohl(highest->packet.header.ts) < ntohl(np->packet.header.ts)) {
+			if (highest) second_highest = highest;
+			highest = np;
+		}
+	}
+	switch_mutex_unlock(jb->list_mutex);
+
+	return second_highest ? second_highest : highest;
+}
+
+
 static inline void jb_hit(switch_jb_t *jb)
 {
 	jb->period_good_count++;
@@ -480,9 +500,9 @@ static inline void jb_miss(switch_jb_t *jb)
 	jb->consec_good_count = 0;
 }
 
-static inline int verify_oldest_frame(switch_jb_t *jb)
+static inline int verify_penultimate_frame(switch_jb_t *jb)
 {
-	switch_jb_node_t *lowest = jb_find_lowest_node(jb), *np = NULL;
+	switch_jb_node_t *lowest = jb_find_penultimate_node(jb), *np = NULL;
 	int r = 0;
 
 	if (!lowest || !(lowest = jb_find_lowest_seq(jb, lowest->packet.header.ts))) {
@@ -511,9 +531,9 @@ static inline int verify_oldest_frame(switch_jb_t *jb)
 
  end:
 
-	if (!r && jb->session) {
-		switch_core_session_request_video_refresh(jb->session);
-	}
+	//if (!r && jb->session) {
+		//switch_core_session_request_video_refresh(jb->session);
+	//}
 
 	return r;
 }
@@ -572,7 +592,7 @@ static inline void add_node(switch_jb_t *jb, switch_rtp_packet_t *packet, switch
 			jb->complete_frames++;
 			jb_debug(jb, 2, "WRITE frame ts: %u complete=%u/%u n:%u\n", ntohl(node->packet.header.ts), jb->complete_frames , jb->frame_len, jb->visible_nodes);
 			jb->highest_wrote_ts = packet->header.ts;
-			verify_oldest_frame(jb);
+			verify_penultimate_frame(jb);
 		} else if (!jb->write_init) {
 			jb->highest_wrote_ts = packet->header.ts;
 		}
@@ -653,9 +673,9 @@ static inline switch_status_t jb_next_packet_by_seq(switch_jb_t *jb, switch_jb_n
 		if (jb->type == SJB_VIDEO) {
 			int x;
 
-			if (jb->session) {
-				switch_core_session_request_video_refresh(jb->session);
-			}
+			//if (jb->session) {
+			//	switch_core_session_request_video_refresh(jb->session);
+			//}
 			
 			for (x = 0; x < 10; x++) {
 				increment_seq(jb);
@@ -785,6 +805,10 @@ SWITCH_DECLARE(void) switch_jb_reset(switch_jb_t *jb)
 		switch_core_inthash_destroy(&jb->missing_seq_hash);
 		switch_core_inthash_init(&jb->missing_seq_hash);
 		switch_mutex_unlock(jb->mutex);
+
+		if (jb->session) {
+			switch_core_session_request_video_refresh(jb->session);
+		}
 	}
 
 	jb_debug(jb, 2, "%s", "RESET BUFFER\n");
@@ -1187,7 +1211,7 @@ SWITCH_DECLARE(switch_status_t) switch_jb_get_packet(switch_jb_t *jb, switch_rtp
 
 	switch_mutex_unlock(jb->mutex);
 
-	if (status == SWITCH_STATUS_SUCCESS) {
+	if (status == SWITCH_STATUS_SUCCESS && jb->type == SJB_AUDIO) {
 		if (jb->complete_frames > jb->max_frame_len) {
 			drop_oldest_frame(jb);
 		}
diff --git a/src/switch_rtp.c b/src/switch_rtp.c
index 44aac5b134..46ddbb7964 100644
--- a/src/switch_rtp.c
+++ b/src/switch_rtp.c
@@ -1895,14 +1895,14 @@ static int using_ice(switch_rtp_t *rtp_session)
 	return 0;
 }
 
-#define MAX_NACK 10
+#define MAX_NACK 1
 static int check_rtcp_and_ice(switch_rtp_t *rtp_session)
 {
 	int ret = 0;
 	int rtcp_ok = 0, rtcp_fb = 0;
 	switch_time_t now = switch_micro_time_now();
 	int rate = 0, nack_ttl = 0;
-	uint32_t cur_nack[MAX_NACK];
+	uint32_t cur_nack[MAX_NACK] = { 0 };
 
 	if (rtp_session->flags[SWITCH_RTP_FLAG_AUTO_CNG] && rtp_session->send_msg.header.ts && rtp_session->cng_pt != INVALID_PT &&
 		(rtp_session->timer.samplecount - rtp_session->last_write_samplecount >= rtp_session->samples_per_interval * 60)) {
@@ -7031,31 +7031,31 @@ static int rtp_common_write(switch_rtp_t *rtp_session,
 		}
 
 		if (!rtp_session->ts_norm.last_ssrc || send_msg->header.ssrc != rtp_session->ts_norm.last_ssrc) {
-#define USE_DELTA
-#ifdef USE_DELTA
-			if (rtp_session->ts_norm.last_ssrc) {
-				rtp_session->ts_norm.delta_ct = 1;
-				rtp_session->ts_norm.delta_ttl = 0;
-				if (rtp_session->ts_norm.delta) {
-					rtp_session->ts_norm.ts += rtp_session->ts_norm.delta;
+ 			if (switch_rtp_test_flag(rtp_session, SWITCH_RTP_FLAG_GEN_TS_DELTA)) {
+				if (rtp_session->ts_norm.last_ssrc) {
+					rtp_session->ts_norm.delta_ct = 1;
+					rtp_session->ts_norm.delta_ttl = 0;
+					if (rtp_session->ts_norm.delta) {
+						rtp_session->ts_norm.ts += rtp_session->ts_norm.delta;
+					}
 				}
 			}
-#endif
+
 			rtp_session->ts_norm.last_ssrc = send_msg->header.ssrc;
 			rtp_session->ts_norm.last_frame = ntohl(send_msg->header.ts);
 		}
 		
 
 		if (ntohl(send_msg->header.ts) != rtp_session->ts_norm.last_frame) {
-#ifdef USE_DELTA
-			int32_t delta = (int32_t) (ntohl(send_msg->header.ts) - rtp_session->ts_norm.last_frame);
+			if (switch_rtp_test_flag(rtp_session, SWITCH_RTP_FLAG_GEN_TS_DELTA)) {
+				int32_t delta = (int32_t) (ntohl(send_msg->header.ts) - rtp_session->ts_norm.last_frame);
 			
-			rtp_session->ts_norm.delta = delta;
-			rtp_session->ts_norm.ts += rtp_session->ts_norm.delta;
-#else
-			switch_core_timer_sync(&rtp_session->timer);
-			rtp_session->ts_norm.ts = rtp_session->timer.samplecount;
-#endif
+				rtp_session->ts_norm.delta = delta;
+				rtp_session->ts_norm.ts += rtp_session->ts_norm.delta;
+			} else {
+				switch_core_timer_sync(&rtp_session->timer);
+				rtp_session->ts_norm.ts = rtp_session->timer.samplecount;
+			}
 		}
 		
 		rtp_session->ts_norm.last_frame = ntohl(send_msg->header.ts);