--- chan_iax2.c.ORIG	Thu Nov  3 17:08:33 2005
+++ chan_iax2.c	Thu Nov  3 17:08:39 2005
@@ -2075,7 +2075,8 @@
 {
 	int x;
 
-	if ( (fr->ts & 0xFFFF0000) == (iaxs[fr->callno]->last & 0xFFFF0000) ) {
+	if ( (fr->ts & 0xFFFF0000) == (iaxs[fr->callno]->last & 0xFFFF0000) ||
+	     (fr->ts & 0x80000000) ) {
 		x = fr->ts - iaxs[fr->callno]->last;
 		if (x < -50000) {
 			/* Sudden big jump backwards in timestamp: