Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 216545)
+++ channels/chan_sip.c	(working copy)
@@ -16035,8 +16035,8 @@
 /*! \brief Callback for show_chanstats */
 static int show_chanstats_cb(void *__cur, void *__arg, int flags)
 {
-#define FORMAT2 "%-15.15s  %-11.11s  %-8.8s %-10.10s  %-10.10s (%-2.2s) %-6.6s %-10.10s  %-10.10s ( %%) %-6.6s\n"
-#define FORMAT  "%-15.15s  %-11.11s  %-8.8s %-10.10u%-1.1s %-10.10u (%-2.2u%%) %-6.6u %-10.10u%-1.1s %-10.10u (%-2.2u%%) %-6.6u\n"
+#define FORMAT2 "%-15.15s  %-11.11s  %-8.8s %-10.10s  %-10.10s (     %%) %-6.6s %-10.10s  %-10.10s (     %%) %-6.6s\n"
+#define FORMAT  "%-15.15s  %-11.11s  %-8.8s %-10.10u%-1.1s %-10.10u (%5.2f%%) %-6.6u %-10.10u%-1.1s %-10.10u (%5.2f%%) %-6.6u\n"
 	struct sip_pvt *cur = __cur;
 	struct ast_rtp_instance_stats stats;
 	char durbuf[10];
@@ -16075,12 +16075,12 @@
 		stats.rxcount > (unsigned int) 100000 ? (unsigned int) (stats.rxcount)/(unsigned int) 1000 : stats.rxcount,
 		stats.rxcount > (unsigned int) 100000 ? "K":" ",
 		stats.rxploss,
-		stats.rxcount > stats.rxploss ? (stats.rxploss / stats.rxcount * 100) : 0,
+		(stats.rxcount + stats.rxploss) > 0 ? (double) stats.rxploss / (stats.rxcount + stats.rxploss) * 100 : 0,
 		stats.rxjitter,
 		stats.txcount > (unsigned int) 100000 ? (unsigned int) (stats.txcount)/(unsigned int) 1000 : stats.txcount,
 		stats.txcount > (unsigned int) 100000 ? "K":" ",
 		stats.txploss,
-		stats.txcount > stats.txploss ? (stats.txploss / stats.txcount * 100) : 0,
+		stats.txcount > 0 ? (double) stats.txploss / stats.txcount * 100 : 0,
 		stats.txjitter
 	);
 	arg->numchans++;
@@ -16108,7 +16108,7 @@
 	if (a->argc != 3)
 		return CLI_SHOWUSAGE;
 
-	ast_cli(a->fd, FORMAT2, "Peer", "Call ID", "Duration", "Recv: Pack", "Lost", "%", "Jitter", "Send: Pack", "Lost", "Jitter");
+	ast_cli(a->fd, FORMAT2, "Peer", "Call ID", "Duration", "Recv: Pack", "Lost", "Jitter", "Send: Pack", "Lost", "Jitter");
 	/* iterate on the container and invoke the callback on each item */
 	ao2_t_callback(dialogs, OBJ_NODATA, show_chanstats_cb, &arg, "callback to sip show chanstats");
 	ast_cli(a->fd, "%d active SIP channel%s\n", arg.numchans, (arg.numchans != 1) ? "s" : "");
Index: res/res_rtp_asterisk.c
===================================================================
--- res/res_rtp_asterisk.c	(revision 216545)
+++ res/res_rtp_asterisk.c	(working copy)
@@ -396,6 +396,8 @@
 	if (!(rtp = ast_calloc(1, sizeof(*rtp)))) {
 		return -1;
 	}
+	/* Clear all statistics values */
+	memset(rtp, 0, sizeof(struct ast_rtp));
 
 	/* Set default parameters on the newly created RTP structure */
 	rtp->ssrc = ast_random();
@@ -2163,6 +2165,9 @@
 		if (!(rtp->rtcp = ast_calloc(1, sizeof(*rtp->rtcp)))) {
 			return;
 		}
+		/* Clear all statistics values */
+		memset(rtp->rtcp, 0, sizeof(struct ast_rtcp));
+
 		if ((rtp->rtcp->s = create_new_socket("RTCP")) < 0) {
 			ast_debug(1, "Failed to create a new socket for RTCP on instance '%p'\n", instance);
 			ast_free(rtp->rtcp);