Index: main/rtp.c
===================================================================
--- main/rtp.c	(revision 272803)
+++ main/rtp.c	(working copy)
@@ -776,7 +776,11 @@
 			new_duration += 0xFFFF + 1;
 		new_duration = (new_duration & ~0xFFFF) | samples;
 
-		if (rtp->lastevent > seqno) {
+		/* The second portion of this check is to not mistakenly
+		 * stop accepting DTMF if the seqno rolls over beyond
+		 * 65535.
+		 */
+		if (rtp->lastevent > seqno && rtp->lastevent - seqno < 50) {
 			/* Out of order frame. Processing this can cause us to
 			 * improperly duplicate incoming DTMF, so just drop
 			 * this.