diff --git a/openbsc/src/libmgcp/mgcp_osmux.c b/openbsc/src/libmgcp/mgcp_osmux.c
index 0fa7b45..d5e671d 100644
--- a/openbsc/src/libmgcp/mgcp_osmux.c
+++ b/openbsc/src/libmgcp/mgcp_osmux.c
@@ -261,6 +261,8 @@
 	return msg;
 }
 
+#define osmux_chunk_length(msg, rem) (rem - msg->len);
+
 int osmux_read_from_bsc_nat_cb(struct osmo_fd *ofd, unsigned int what)
 {
 	struct msgb *msg;
@@ -268,6 +270,7 @@
 	struct llist_head list;
 	struct sockaddr_in addr;
 	struct mgcp_config *cfg = ofd->data;
+	uint32_t rem;
 
 	msg = osmux_recv(ofd, &addr);
 	if (!msg)
@@ -277,6 +280,7 @@
 	if (msg->data[0] == MGCP_DUMMY_LOAD)
 		goto out;
 
+	rem = msg->len;
 	while((osmuxh = osmux_xfrm_output_pull(msg)) != NULL) {
 		struct mgcp_endpoint *endp;
 
@@ -289,6 +293,10 @@
 			     osmuxh->circuit_id);
 			goto out;
 		}
+		endp->osmux.stats.octets += osmux_chunk_length(msg, rem);
+		endp->osmux.stats.chunks++;
+		rem = msg->len;
+
 		osmux_xfrm_output(osmuxh, &endp->osmux.out, &list);
 		osmux_tx_sched(&list, scheduled_tx_bts_cb, endp);
 	}
@@ -355,6 +363,7 @@
 	struct llist_head list;
 	struct sockaddr_in addr;
 	struct mgcp_config *cfg = ofd->data;
+	uint32_t rem;
 
 	msg = osmux_recv(ofd, &addr);
 	if (!msg)
@@ -364,6 +373,7 @@
 	if (msg->data[0] == MGCP_DUMMY_LOAD)
 		return osmux_handle_dummy(cfg, &addr, msg);
 
+	rem = msg->len;
 	while((osmuxh = osmux_xfrm_output_pull(msg)) != NULL) {
 		struct mgcp_endpoint *endp;
 
@@ -376,6 +386,10 @@
 			     osmuxh->circuit_id);
 			goto out;
 		}
+		endp->osmux.stats.octets += osmux_chunk_length(msg, rem);
+		endp->osmux.stats.chunks++;
+		rem = msg->len;
+
 		osmux_xfrm_output(osmuxh, &endp->osmux.out, &list);
 		osmux_tx_sched(&list, scheduled_tx_net_cb, endp);
 	}
diff --git a/openbsc/src/libmgcp/mgcp_protocol.c b/openbsc/src/libmgcp/mgcp_protocol.c
index a728b67..79422fe 100644
--- a/openbsc/src/libmgcp/mgcp_protocol.c
+++ b/openbsc/src/libmgcp/mgcp_protocol.c
@@ -1745,12 +1745,24 @@
 	size -= nchars;
 
 	/* Error Counter */
-	snprintf(msg, size,
-		 "\r\nX-Osmo-CP: EC TIS=%u, TOS=%u, TIR=%u, TOR=%u",
-		 endp->net_state.in_stream.err_ts_counter,
-		 endp->net_state.out_stream.err_ts_counter,
-		 endp->bts_state.in_stream.err_ts_counter,
-		 endp->bts_state.out_stream.err_ts_counter);
+	nchars = snprintf(msg, size,
+			  "\r\nX-Osmo-CP: EC TIS=%u, TOS=%u, TIR=%u, TOR=%u",
+			  endp->net_state.in_stream.err_ts_counter,
+			  endp->net_state.out_stream.err_ts_counter,
+			  endp->bts_state.in_stream.err_ts_counter,
+			  endp->bts_state.out_stream.err_ts_counter);
+	if (nchars < 0 || nchars >= size)
+		goto truncate;
+
+	msg += nchars;
+	size -= nchars;
+
+	if (endp->osmux.state == OSMUX_STATE_ENABLED) {
+		snprintf(msg, size,
+			 "\r\nX-Osmux-ST: CR=%u, BR=%u",
+			 endp->osmux.stats.chunks,
+			 endp->osmux.stats.octets);
+	}
 truncate:
 	msg[size - 1] = '\0';
 }