--- res_rtp_asterisk.c.orig	2020-04-01 20:28:07.000000000 +0200
+++ res_rtp_asterisk.c	2020-04-01 20:30:34.000000000 +0200
@@ -5426,7 +5426,8 @@
 
 		if (event_end & 0x80) {
 			/* End event */
-			if ((rtp->last_seqno != seqno) && (timestamp > rtp->last_end_timestamp)) {
+                        ast_debug(1,"TNE Test Event end last_end_timestamp:%d timestamp:%d\n",rtp->last_end_timestamp,timestamp);
+			if ((rtp->last_seqno != seqno) && ((timestamp > rtp->last_end_timestamp) || ((timestamp == 0) && (rtp->last_end_timestamp == 0)))) {
 				rtp->last_end_timestamp = timestamp;
 				rtp->dtmf_duration = new_duration;
 				rtp->resp = resp;