diff --git a/openbsc/tests/atlocal.in b/openbsc/tests/atlocal.in
index 4635113..542a78e 100644
--- a/openbsc/tests/atlocal.in
+++ b/openbsc/tests/atlocal.in
@@ -1,3 +1,4 @@
 enable_nat_test='@osmo_ac_build_nat@'
 enable_smpp_test='@osmo_ac_build_smpp@'
 enable_bsc_test='@osmo_ac_build_bsc@'
+enable_mgcp_transcoding_test='@osmo_ac_mgcp_transcoding@'
diff --git a/openbsc/tests/mgcp/Makefile.am b/openbsc/tests/mgcp/Makefile.am
index 71bf8c0..81f28ae 100644
--- a/openbsc/tests/mgcp/Makefile.am
+++ b/openbsc/tests/mgcp/Makefile.am
@@ -1,11 +1,15 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOSCCP_CFLAGS) $(COVERAGE_CFLAGS)
+AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_srcdir)
+AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOSCCP_CFLAGS) $(COVERAGE_CFLAGS) $(LIBBCG729_CFLAGS)
 AM_LDFLAGS = $(COVERAGE_LDFLAGS)
 
-EXTRA_DIST = mgcp_test.ok
+EXTRA_DIST = mgcp_test.ok mgcp_transcoding_test.ok
 
 noinst_PROGRAMS = mgcp_test
 
+if BUILD_MGCP_TRANSCODING
+noinst_PROGRAMS += mgcp_transcoding_test
+endif
+
 mgcp_test_SOURCES = mgcp_test.c
 
 mgcp_test_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
@@ -13,3 +17,12 @@ mgcp_test_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
 		$(top_builddir)/src/libcommon/libcommon.a \
 		$(LIBOSMOCORE_LIBS) -lrt -lm $(LIBOSMOSCCP_LIBS) $(LIBOSMOVTY_LIBS) \
 		$(LIBRARY_DL)
+
+mgcp_transcoding_test_SOURCES = mgcp_transcoding_test.c $(top_builddir)/src/osmo-bsc_mgcp/mgcp_transcode.c
+
+mgcp_transcoding_test_LDADD = \
+		$(top_builddir)/src/libbsc/libbsc.a \
+		$(top_builddir)/src/libmgcp/libmgcp.a \
+		$(top_builddir)/src/libcommon/libcommon.a \
+		$(LIBOSMOCORE_LIBS) $(LIBBCG729_LIBS) -lrt -lm $(LIBOSMOSCCP_LIBS) $(LIBOSMOVTY_LIBS) \
+		$(LIBRARY_DL)
diff --git a/openbsc/tests/mgcp/mgcp_transcoding_test.c b/openbsc/tests/mgcp/mgcp_transcoding_test.c
new file mode 100644
index 0000000..e5da138
--- /dev/null
+++ b/openbsc/tests/mgcp/mgcp_transcoding_test.c
@@ -0,0 +1,377 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <err.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/application.h>
+
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/mgcp.h>
+#include <openbsc/mgcp_internal.h>
+
+#include "bscconfig.h"
+#ifndef BUILD_MGCP_TRANSCODING
+#error "Requires MGCP transcoding enabled (see --enable-mgcp-transcoding)"
+#endif
+
+#include "src/osmo-bsc_mgcp/mgcp_transcode.h"
+
+uint8_t *audio_frame_l16[] = {
+};
+
+struct rtp_packets {
+	float t;
+	int len;
+	char *data;
+};
+
+struct rtp_packets audio_packets_l16[] = {
+	/* RTP: SeqNo=1, TS=160 */
+	{0.020000, 332,
+		"\x80\x0B\x00\x01\x00\x00\x00\xA0\x11\x22\x33\x44"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+		"\x00\x00\x40\x13\x5A\x9E\x40\x13\x00\x00\xBF\xED\xA5\x62\xBF\xED"
+	},
+};
+
+struct rtp_packets audio_packets_gsm[] = {
+	/* RTP: SeqNo=1, TS=160 */
+	{0.020000, 45,
+		"\x80\x03\x00\x01\x00\x00\x00\xA0\x11\x22\x33\x44"
+		"\xD4\x7C\xE3\xE9\x62\x50\x39\xF0\xF8\xB4\x68\xEA\x6C\x0E\x81\x1B"
+		"\x56\x2A\xD5\xBC\x69\x9C\xD1\xF0\x66\x7A\xEC\x49\x7A\x33\x3D\x0A"
+		"\xDE"
+	},
+};
+
+struct rtp_packets audio_packets_gsm_invalid_size[] = {
+	/* RTP: SeqNo=1, TS=160 */
+	{0.020000, 41,
+		"\x80\x03\x00\x01\x00\x00\x00\xA0\x11\x22\x33\x44"
+		"\xD4\x7C\xE3\xE9\x62\x50\x39\xF0\xF8\xB4\x68\xEA\x6C\x0E\x81\x1B"
+		"\x56\x2A\xD5\xBC\x69\x9C\xD1\xF0\x66\x7A\xEC\x49\x7A\x33\x3D\x0A"
+		"\xDE"
+	},
+};
+
+struct rtp_packets audio_packets_gsm_invalid_data[] = {
+	/* RTP: SeqNo=1, TS=160 */
+	{0.020000, 45,
+		"\x80\x03\x00\x01\x00\x00\x00\xA0\x11\x22\x33\x44"
+		"\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE"
+		"\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE\xEE"
+		"\xEE"
+	},
+};
+
+struct rtp_packets audio_packets_gsm_invalid_ptype[] = {
+	/* RTP: SeqNo=1, TS=160 */
+	{0.020000, 45,
+		"\x80\x08\x00\x01\x00\x00\x00\xA0\x11\x22\x33\x44"
+		"\xD4\x7C\xE3\xE9\x62\x50\x39\xF0\xF8\xB4\x68\xEA\x6C\x0E\x81\x1B"
+		"\x56\x2A\xD5\xBC\x69\x9C\xD1\xF0\x66\x7A\xEC\x49\x7A\x33\x3D\x0A"
+		"\xDE"
+	},
+};
+
+struct rtp_packets audio_packets_g729[] = {
+	/* RTP: SeqNo=1, TS=160 */
+	{0.020000, 32,
+		"\x80\x12\x00\x01\x00\x00\x00\xA0\x11\x22\x33\x44"
+		"\xAF\xC2\x81\x40\x00\xFA\xCE\xA4\x21\x7C\xC5\xC3\x4F\xA5\x98\xF5"
+		"\xB2\x95\xC4\xAD"
+	},
+};
+
+struct rtp_packets audio_packets_pcma[] = {
+	/* RTP: SeqNo=1, TS=160 */
+	{0.020000, 172,
+		"\x80\x08\x00\x01\x00\x00\x00\xA0\x11\x22\x33\x44"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+		"\xD5\xA5\xA3\xA5\xD5\x25\x23\x25\xD5\xA5\xA3\xA5\xD5\x25\x23\x25"
+	},
+};
+
+
+
+static int audio_name_to_type(const char *name)
+{
+	if (!strcasecmp(name, "gsm"))
+		return 3;
+#ifdef HAVE_BCG729
+	else if (!strcasecmp(name, "g729"))
+		return 18;
+#endif
+	else if (!strcasecmp(name, "pcma"))
+		return 8;
+	else if (!strcasecmp(name, "l16"))
+		return 11;
+	return -1;
+}
+
+int mgcp_get_trans_frame_size(void *state_, int nsamples, int dst);
+
+static int transcode_test(const char *srcfmt, const char *dstfmt,
+			  uint8_t *src_pkts, size_t src_pkt_size)
+{
+	char buf[4096] = {0x80, 0};
+	int rc;
+	struct mgcp_rtp_end *dst_end;
+	struct mgcp_rtp_end *src_end;
+	struct mgcp_trunk_config tcfg = {{0}};
+	struct mgcp_endpoint endp = {0};
+	struct mgcp_process_rtp_state *state;
+	int in_size;
+	int in_samples = 160;
+	int len, cont;
+
+	printf("== Transcoding test ==\n");
+	printf("converting %s -> %s\n", srcfmt, dstfmt);
+
+	tcfg.endpoints = &endp;
+	tcfg.number_endpoints = 1;
+	endp.tcfg = &tcfg;
+	mgcp_free_endp(&endp);
+
+	dst_end = &endp.bts_end;
+	src_end = &endp.net_end;
+
+	src_end->payload_type = audio_name_to_type(srcfmt);
+	dst_end->payload_type = audio_name_to_type(dstfmt);
+
+	rc = mgcp_transcoding_setup(&endp, dst_end, src_end);
+	if (rc < 0)
+		errx(1, "setup failed: %s", strerror(-rc));
+
+	state = dst_end->rtp_process_data;
+	OSMO_ASSERT(state != NULL);
+
+	in_size = mgcp_transcoding_get_frame_size(state, in_samples, 0);
+	OSMO_ASSERT(sizeof(buf) >= in_size + 12);
+
+	memcpy(buf, src_pkts, src_pkt_size);
+
+	len = src_pkt_size;
+
+	cont = mgcp_transcoding_process_rtp(&endp, dst_end,
+					    buf, &len, sizeof(buf));
+	if (cont < 0)
+		errx(1, "processing failed: %s", strerror(-cont));
+
+	if (len < 24) {
+		printf("encoded: %s\n", osmo_hexdump((unsigned char *)buf, len));
+	} else {
+		const char *str = osmo_hexdump((unsigned char *)buf, len);
+		int i = 0;
+		const int prefix = 4;
+		const int cutlen = 48;
+		int nchars = 0;
+
+		printf("encoded:\n");
+		do {
+			nchars = printf("%*s%-.*s", prefix, "", cutlen, str + i);
+			i += nchars - prefix;
+			printf("\n");
+		} while (nchars - prefix >= cutlen);
+	}
+	return 0;
+}
+
+static int test_repacking(int in_samples, int out_samples, int no_transcode)
+{
+	char buf[4096] = {0x80, 0};
+	int cc, rc;
+	struct mgcp_rtp_end *dst_end;
+	struct mgcp_rtp_end *src_end;
+	struct mgcp_config *cfg;
+	struct mgcp_trunk_config tcfg = {{0}};
+	struct mgcp_endpoint endp = {0};
+	struct mgcp_process_rtp_state *state;
+	int in_cnt;
+	int out_size;
+	int in_size;
+	uint32_t ts = 0;
+	uint16_t seq = 0;
+	const char *srcfmt = "pcma";
+	const char *dstfmt = no_transcode ? "pcma" : "l16";
+
+	cfg = mgcp_config_alloc();
+
+	tcfg.endpoints = &endp;
+	tcfg.number_endpoints = 1;
+	tcfg.cfg = cfg;
+	endp.tcfg = &tcfg;
+	endp.cfg = cfg;
+	mgcp_free_endp(&endp);
+
+	dst_end = &endp.bts_end;
+	src_end = &endp.net_end;
+
+	printf("== Transcoding test ==\n");
+	printf("converting %s -> %s\n", srcfmt, dstfmt);
+
+	src_end->payload_type = audio_name_to_type(srcfmt);
+	dst_end->payload_type = audio_name_to_type(dstfmt);
+
+	if (out_samples) {
+		dst_end->frame_duration_den = dst_end->rate;
+		dst_end->frame_duration_num = out_samples;
+		dst_end->frames_per_packet = 1;
+		dst_end->force_output_ptime = 1;
+	}
+
+	rc = mgcp_transcoding_setup(&endp, dst_end, src_end);
+	if (rc < 0)
+		errx(1, "setup failed: %s", strerror(-rc));
+
+	state = dst_end->rtp_process_data;
+	OSMO_ASSERT(state != NULL);
+
+	in_size = mgcp_transcoding_get_frame_size(state, in_samples, 0);
+	OSMO_ASSERT(sizeof(buf) >= in_size + 12);
+
+	out_size = mgcp_transcoding_get_frame_size(state, -1, 1);
+	OSMO_ASSERT(sizeof(buf) >= out_size + 12);
+
+	buf[1] = src_end->payload_type;
+	*(uint16_t*)(buf+2) = htons(1);
+	*(uint32_t*)(buf+4) = htonl(0);
+	*(uint32_t*)(buf+8) = htonl(0xaabbccdd);
+
+	for (in_cnt = 0; in_cnt < 16; in_cnt++) {
+		int cont;
+		int len;
+
+		/* fake PCMA data */
+		printf("generating %d %s input samples\n", in_samples, srcfmt);
+		for (cc = 0; cc < in_samples; cc++)
+			buf[12+cc] = cc;
+
+		*(uint16_t*)(buf+2) = htonl(seq);
+		*(uint32_t*)(buf+4) = htonl(ts);
+
+		seq += 1;
+		ts += in_samples;
+
+		cc += 12; /* include RTP header */
+
+		len = cc;
+
+		do {
+			cont = mgcp_transcoding_process_rtp(&endp, dst_end,
+							    buf, &len, sizeof(buf));
+			if (cont == -EAGAIN) {
+				fprintf(stderr, "Got EAGAIN\n");
+				break;
+			}
+
+			if (cont < 0)
+				errx(1, "processing failed: %s", strerror(-cont));
+
+			len -= 12; /* ignore RTP header */
+
+			printf("got %d %s output frames (%d octets)\n",
+			       len / out_size, dstfmt, len);
+
+			len = cont;
+		} while (len > 0);
+	}
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	osmo_init_logging(&log_info);
+
+	printf("=== Transcoding Good Cases ===\n");
+
+	transcode_test("l16", "l16",
+		       (uint8_t *)audio_packets_l16[0].data,
+		       audio_packets_l16[0].len);
+	transcode_test("l16", "gsm",
+		       (uint8_t *)audio_packets_l16[0].data,
+		       audio_packets_l16[0].len);
+	transcode_test("l16", "pcma",
+		       (uint8_t *)audio_packets_l16[0].data,
+		       audio_packets_l16[0].len);
+	transcode_test("gsm", "l16",
+		       (uint8_t *)audio_packets_gsm[0].data,
+		       audio_packets_gsm[0].len);
+	transcode_test("gsm", "gsm",
+		       (uint8_t *)audio_packets_gsm[0].data,
+		       audio_packets_gsm[0].len);
+	transcode_test("gsm", "pcma",
+		       (uint8_t *)audio_packets_gsm[0].data,
+		       audio_packets_gsm[0].len);
+	transcode_test("pcma", "l16",
+		       (uint8_t *)audio_packets_pcma[0].data,
+		       audio_packets_pcma[0].len);
+	transcode_test("pcma", "gsm",
+		       (uint8_t *)audio_packets_pcma[0].data,
+		       audio_packets_pcma[0].len);
+	transcode_test("pcma", "pcma",
+		       (uint8_t *)audio_packets_pcma[0].data,
+		       audio_packets_pcma[0].len);
+
+	printf("=== Transcoding Bad Cases ===\n");
+
+	printf("Invalid size:\n");
+	transcode_test("gsm", "pcma",
+		       (uint8_t *)audio_packets_gsm_invalid_size[0].data,
+		       audio_packets_gsm_invalid_size[0].len);
+
+	printf("Invalid data:\n");
+	transcode_test("gsm", "pcma",
+		       (uint8_t *)audio_packets_gsm_invalid_data[0].data,
+		       audio_packets_gsm_invalid_data[0].len);
+
+	printf("Invalid payload type:\n");
+	transcode_test("gsm", "pcma",
+		       (uint8_t *)audio_packets_gsm_invalid_ptype[0].data,
+		       audio_packets_gsm_invalid_ptype[0].len);
+
+	printf("=== Repacking ===\n");
+
+	test_repacking(160, 160, 0);
+	test_repacking(160, 160, 1);
+	test_repacking(160, 80, 0);
+	test_repacking(160, 80, 1);
+	test_repacking(160, 320, 0);
+	test_repacking(160, 320, 1);
+	test_repacking(160, 240, 0);
+	test_repacking(160, 240, 1);
+	test_repacking(160, 100, 0);
+	test_repacking(160, 100, 1);
+
+	return 0;
+}
+
diff --git a/openbsc/tests/mgcp/mgcp_transcoding_test.ok b/openbsc/tests/mgcp/mgcp_transcoding_test.ok
new file mode 100644
index 0000000..189d079
--- /dev/null
+++ b/openbsc/tests/mgcp/mgcp_transcoding_test.ok
@@ -0,0 +1,534 @@
+=== Transcoding Good Cases ===
+== Transcoding test ==
+converting l16 -> l16
+encoded:
+    80 0b 00 01 00 00 00 a0 11 22 33 44 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 00 00 40 13 
+    5a 9e 40 13 00 00 bf ed a5 62 bf ed 
+== Transcoding test ==
+converting l16 -> gsm
+encoded:
+    80 0b 00 00 00 00 00 a0 11 22 33 44 d4 7c e3 e9 
+    62 50 39 f0 f8 b4 68 ea 6c 0e 81 1b 56 2a d5 bc 
+    69 9c d1 f0 66 7a ec 49 7a 33 3d 0a de 
+== Transcoding test ==
+converting l16 -> pcma
+encoded:
+    80 0b 00 00 00 00 00 a0 11 22 33 44 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 
+== Transcoding test ==
+converting gsm -> l16
+encoded:
+    80 03 00 00 00 00 00 a0 11 22 33 44 00 00 54 00 
+    59 f0 34 20 c4 c8 b9 f8 e2 18 f1 e8 f2 28 f0 e0 
+    46 08 4f 80 2c a0 a9 c8 80 00 c0 58 3f 80 63 c0 
+    24 b8 fa b8 f6 88 0b a0 c8 70 a8 b0 c8 c0 3b a8 
+    66 a0 2e 38 d1 f8 98 98 aa 18 e8 30 26 a0 37 40 
+    37 e8 17 00 ee 50 b7 80 b1 88 de 28 18 40 45 b0 
+    4f 48 21 d8 df 78 ae 68 ab 98 d6 b8 18 18 48 90 
+    4e 70 27 40 e8 10 b5 b0 ac 80 d4 60 14 50 48 48 
+    50 10 2a 00 ec 08 ba 00 af 58 d1 c0 10 60 45 c8 
+    54 10 30 78 f1 a8 bb 18 ad 48 ce 30 0a e8 3f 30 
+    4f 10 32 18 f6 18 bf 20 ac 30 cd 80 0b d0 43 d8 
+    55 e0 34 a0 f5 78 bc 98 ad 98 cd c8 0a 80 40 58 
+    51 c0 35 40 f9 60 c1 68 ac c8 cb 38 08 00 40 98 
+    51 e0 34 d8 fa 28 c2 f0 ae 40 c7 70 02 d0 3c a8 
+    54 78 38 a0 fc 68 c2 08 ad 50 c7 78 01 60 39 c0 
+    51 38 3a e8 00 e8 c6 38 ab d8 c4 00 fe 08 39 18 
+    50 30 39 50 01 d8 ca 70 b1 80 c4 c8 fc 58 36 40 
+    51 d8 3b 08 02 80 c8 58 b0 60 c5 a8 fb d0 33 e8 
+    4e 80 3c e0 06 10 cb 90 ae 48 c2 60 f9 58 34 08 
+    4d a0 3a a8 06 48 cf 80 b4 60 c3 e8 f7 90 30 18 
+    4d a0 3b 98 07 90 cf 18 b4 68 c4 88 
+== Transcoding test ==
+converting gsm -> gsm
+encoded:
+    80 03 00 01 00 00 00 a0 11 22 33 44 d4 7c e3 e9 
+    62 50 39 f0 f8 b4 68 ea 6c 0e 81 1b 56 2a d5 bc 
+    69 9c d1 f0 66 7a ec 49 7a 33 3d 0a de 
+== Transcoding test ==
+converting gsm -> pcma
+encoded:
+    80 03 00 00 00 00 00 a0 11 22 33 44 d5 a0 a3 bf 
+    38 24 08 19 1e 1b a4 a6 b3 20 2a 3a ba ad b7 60 
+    17 92 3e 20 3e b8 ac b2 32 2c 20 02 b6 be be 82 
+    04 27 26 35 8d a4 a6 b5 35 21 20 31 8d a7 a6 b6 
+    02 27 21 30 81 a7 a1 b0 06 24 21 32 85 a4 a0 bd 
+    19 24 21 3d 90 ba a6 bc 16 25 21 3c 92 a5 a0 bf 
+    10 25 21 3c 90 a5 a1 bf 6f 3a 21 3f 95 a5 a1 bf 
+    62 3b 21 39 f3 bb a0 b9 79 3b 21 39 c3 b9 a1 b8 
+    db 39 20 3b 4a b9 a1 b9 c8 3f 26 38 78 be a1 b8 
+    f1 3e 26 38 65 bc a6 bb ed 3f 21 3b 6f bf a6 b8 
+    ec 3d 27 3b 15 bd a6 b8 eb 3d 27 38 
+== Transcoding test ==
+converting pcma -> l16
+encoded:
+    80 08 00 00 00 00 00 a0 11 22 33 44 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 00 08 42 00 
+    5a 00 42 00 00 08 be 00 a6 00 be 00 
+== Transcoding test ==
+converting pcma -> gsm
+encoded:
+    80 08 00 00 00 00 00 a0 11 22 33 44 d4 b9 f4 5d 
+    d9 50 5a e1 a0 cd 76 ea 52 0e 87 53 ad d4 ea a2 
+    0a 63 ca e9 60 79 e2 2a 25 d2 c0 f3 39 
+== Transcoding test ==
+converting pcma -> pcma
+encoded:
+    80 08 00 01 00 00 00 a0 11 22 33 44 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 d5 a5 a3 a5 
+    d5 25 23 25 d5 a5 a3 a5 d5 25 23 25 
+=== Transcoding Bad Cases ===
+Invalid size:
+== Transcoding test ==
+converting gsm -> pcma
+encoded:
+    80 03 00 01 00 00 00 a0 11 22 33 44 d4 7c e3 e9 
+    62 50 39 f0 f8 b4 68 ea 6c 0e 81 1b 56 2a d5 bc 
+    69 9c d1 f0 66 7a ec 49 7a 
+Invalid data:
+== Transcoding test ==
+converting gsm -> pcma
+encoded:
+    80 03 00 01 00 00 00 a0 11 22 33 44 ee ee ee ee 
+    ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee 
+    ee ee ee ee ee ee ee ee ee ee ee ee ee 
+Invalid payload type:
+== Transcoding test ==
+converting gsm -> pcma
+encoded:
+    80 08 00 00 00 00 00 a0 11 22 33 44 d5 a0 a3 bf 
+    38 24 08 19 1e 1b a4 a6 b3 20 2a 3a ba ad b7 60 
+    17 92 3e 20 3e b8 ac b2 32 2c 20 02 b6 be be 82 
+    04 27 26 35 8d a4 a6 b5 35 21 20 31 8d a7 a6 b6 
+    02 27 21 30 81 a7 a1 b0 06 24 21 32 85 a4 a0 bd 
+    19 24 21 3d 90 ba a6 bc 16 25 21 3c 92 a5 a0 bf 
+    10 25 21 3c 90 a5 a1 bf 6f 3a 21 3f 95 a5 a1 bf 
+    62 3b 21 39 f3 bb a0 b9 79 3b 21 39 c3 b9 a1 b8 
+    db 39 20 3b 4a b9 a1 b9 c8 3f 26 38 78 be a1 b8 
+    f1 3e 26 38 65 bc a6 bb ed 3f 21 3b 6f bf a6 b8 
+    ec 3d 27 3b 15 bd a6 b8 eb 3d 27 38 
+=== Repacking ===
+== Transcoding test ==
+converting pcma -> l16
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+generating 160 pcma input samples
+got 2 l16 output frames (320 octets)
+== Transcoding test ==
+converting pcma -> pcma
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+generating 160 pcma input samples
+got 2 pcma output frames (160 octets)
+== Transcoding test ==
+converting pcma -> l16
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+== Transcoding test ==
+converting pcma -> pcma
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+== Transcoding test ==
+converting pcma -> l16
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 l16 output frames (640 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 l16 output frames (640 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 l16 output frames (640 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 l16 output frames (640 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 l16 output frames (640 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 l16 output frames (640 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 l16 output frames (640 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 l16 output frames (640 octets)
+== Transcoding test ==
+converting pcma -> pcma
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 pcma output frames (320 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 pcma output frames (320 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 pcma output frames (320 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 pcma output frames (320 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 pcma output frames (320 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 pcma output frames (320 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 pcma output frames (320 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 4 pcma output frames (320 octets)
+== Transcoding test ==
+converting pcma -> l16
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 l16 output frames (480 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 l16 output frames (480 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 l16 output frames (480 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 l16 output frames (480 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 l16 output frames (480 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 l16 output frames (480 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 l16 output frames (480 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 l16 output frames (480 octets)
+== Transcoding test ==
+converting pcma -> pcma
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 pcma output frames (240 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 pcma output frames (240 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 pcma output frames (240 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 pcma output frames (240 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 pcma output frames (240 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 pcma output frames (240 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 pcma output frames (240 octets)
+generating 160 pcma input samples
+generating 160 pcma input samples
+got 3 pcma output frames (240 octets)
+== Transcoding test ==
+converting pcma -> l16
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+generating 160 pcma input samples
+got 1 l16 output frames (160 octets)
+got 1 l16 output frames (160 octets)
+== Transcoding test ==
+converting pcma -> pcma
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
+generating 160 pcma input samples
+got 1 pcma output frames (80 octets)
+got 1 pcma output frames (80 octets)
diff --git a/openbsc/tests/testsuite.at b/openbsc/tests/testsuite.at
index 4465b25..57310d6 100644
--- a/openbsc/tests/testsuite.at
+++ b/openbsc/tests/testsuite.at
@@ -27,6 +27,13 @@ cat $abs_srcdir/mgcp/mgcp_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/mgcp/mgcp_test], [], [expout], [ignore])
 AT_CLEANUP
 
+AT_SETUP([mgcp-trans])
+AT_KEYWORDS([mgcp-trans])
+AT_CHECK([test "$enable_mgcp_transcoding_test" == yes || exit 77])
+cat $abs_srcdir/mgcp/mgcp_transcoding_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/mgcp/mgcp_transcoding_test], [], [expout], [ignore])
+AT_CLEANUP
+
 AT_SETUP([gprs])
 AT_KEYWORDS([gprs])
 cat $abs_srcdir/gprs/gprs_test.ok > expout
