diff --git a/openbsc/tests/mgcp/mgcp_test.c b/openbsc/tests/mgcp/mgcp_test.c
index 538dc9f..7eeef99 100644
--- a/openbsc/tests/mgcp/mgcp_test.c
+++ b/openbsc/tests/mgcp/mgcp_test.c
@@ -16,6 +16,8 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#undef _GNU_SOURCE
+#define _GNU_SOURCE
 
 #include <openbsc/mgcp.h>
 #include <openbsc/mgcp_internal.h>
@@ -24,6 +26,7 @@
 #include <osmocom/core/talloc.h>
 #include <string.h>
 #include <limits.h>
+#include <dlfcn.h>
 
 char *strline_r(char *str, char **saveptr);
 
@@ -293,6 +296,31 @@
 	return MGCP_POLICY_CONT;
 }
 
+#define MGCP_DUMMY_LOAD 0x23
+static int dummy_packets = 0;
+/* override and forward */
+ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
+		const struct sockaddr *dest_addr, socklen_t addrlen)
+{
+	typedef ssize_t (*sendto_t)(int, const void *, size_t, int,
+			const struct sockaddr *, socklen_t);
+	static sendto_t real_sendto = NULL;
+	uint32_t dest_host = htonl(((struct sockaddr_in *)dest_addr)->sin_addr.s_addr);
+	int      dest_port = htons(((struct sockaddr_in *)dest_addr)->sin_port);
+
+	if (!real_sendto)
+		real_sendto = dlsym(RTLD_NEXT, "sendto");
+
+	if (len == 1 && ((const char *)buf)[0] == MGCP_DUMMY_LOAD ) {
+		fprintf(stderr, "Dummy packet to 0x%08x:%d, msg length %d\n%s\n\n",
+		       dest_host, dest_port,
+		       len, osmo_hexdump(buf, len));
+		dummy_packets += 1;
+	}
+
+	return real_sendto(sockfd, buf, len, flags, dest_addr, addrlen);
+}
+
 static void test_messages(void)
 {
 	struct mgcp_config *cfg;
@@ -326,6 +354,7 @@
 		printf("Testing %s\n", t->name);
 
 		last_endpoint = -1;
+		dummy_packets = 0;
 
 		inp = create_msg(t->req);
 		msg = mgcp_handle_message(cfg, inp);
@@ -337,6 +366,9 @@
 			printf("%s failed '%s'\n", t->name, (char *) msg->data);
 		msgb_free(msg);
 
+		if (dummy_packets)
+			printf("Dummy packets: %d\n", dummy_packets);
+
 		if (last_endpoint != -1) {
 			endp = &cfg->trunk.endpoints[last_endpoint];