From 910c03fa62a6d4c2bc3a98c5bafa0b339f48cf33 Mon Sep 17 00:00:00 2001
From: Richard Fuchs <rfuchs@sipwise.com>
Date: Wed, 15 May 2019 09:39:02 -0400
Subject: [PATCH] TT#58660 PCM to RFC DTMF transcoding

Change-Id: Iea6a11c0caad1f5e7dcca966101e2969d3516b6f
---
 daemon/Makefile        |   2 +
 daemon/call.c          |   2 +-
 daemon/codec.c         | 413 ++++++++++++++++++++++----
 daemon/dtmf.c          |  69 +++++
 debian/control         |   1 +
 include/call.h         |   2 +-
 include/codec.h        |   4 +-
 include/dtmf.h         |  10 +
 lib/codeclib.c         |  19 +-
 t/.gitignore           |   1 +
 t/Makefile             |   8 +-
 t/auto-daemon-tests.pl | 381 +++++++++++++++++++++++-
 t/test-dtmf-detect.c   | 649 +++++++++++++++++++++++++++++++++++++++++
 13 files changed, 1494 insertions(+), 67 deletions(-)
 create mode 100644 t/test-dtmf-detect.c

diff --git a/daemon/Makefile b/daemon/Makefile
index 79d26a7eb..35adf4a2a 100644
--- a/daemon/Makefile
+++ b/daemon/Makefile
@@ -75,6 +75,7 @@ CFLAGS+=	$(shell pkg-config --cflags libavformat)
 CFLAGS+=	$(shell pkg-config --cflags libavutil)
 CFLAGS+=	$(shell pkg-config --cflags libswresample)
 CFLAGS+=	$(shell pkg-config --cflags libavfilter)
+CFLAGS+=	$(shell pkg-config --cflags spandsp)
 CFLAGS+=	-DWITH_TRANSCODING
 ifeq ($(have_bcg729),yes)
 CFLAGS+=	-DHAVE_BCG729
@@ -115,6 +116,7 @@ LDLIBS+=	$(shell pkg-config --libs libavformat)
 LDLIBS+=	$(shell pkg-config --libs libavutil)
 LDLIBS+=	$(shell pkg-config --libs libswresample)
 LDLIBS+=	$(shell pkg-config --libs libavfilter)
+LDLIBS+=	$(shell pkg-config --libs spandsp)
 ifeq ($(have_bcg729),yes)
 LDLIBS+=	$(bcg729_lib)
 endif
diff --git a/daemon/call.c b/daemon/call.c
index c43fc81c8..20c7794b0 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -1772,7 +1772,7 @@ static void __update_media_id(struct call_media *media, struct call_media *other
 
 /* called with call->master_lock held in W */
 int monologue_offer_answer(struct call_monologue *other_ml, GQueue *streams,
-		const struct sdp_ng_flags *flags)
+		struct sdp_ng_flags *flags)
 {
 	struct stream_params *sp;
 	GList *media_iter, *ml_media, *other_ml_media;
diff --git a/daemon/codec.c b/daemon/codec.c
index 123f4dd94..884500f23 100644
--- a/daemon/codec.c
+++ b/daemon/codec.c
@@ -3,6 +3,10 @@
 #include <assert.h>
 #include <inttypes.h>
 #include <sys/types.h>
+#include <spandsp/telephony.h>
+#include <spandsp/super_tone_rx.h>
+#include <spandsp/logging.h>
+#include <spandsp/dtmf.h>
 #include "call.h"
 #include "log.h"
 #include "rtplib.h"
@@ -11,6 +15,8 @@
 #include "rtcp.h"
 #include "call_interfaces.h"
 #include "dtmf.h"
+#include "resample.h"
+#include "dtmflib.h"
 
 
 
@@ -65,6 +71,15 @@ struct codec_ssrc_handler {
 	struct timeval first_send;
 	unsigned long first_send_ts;
 	GString *sample_buffer;
+
+	// DTMF DSP stuff
+	dtmf_rx_state_t *dtmf_dsp;
+	resample_t dtmf_resampler;
+	format_t dtmf_format;
+	uint64_t dtmf_ts, last_dtmf_event_ts;
+	GQueue dtmf_events;
+	struct dtmf_event dtmf_event;
+
 	int rtp_mark:1;
 };
 struct transcode_packet {
@@ -75,7 +90,7 @@ struct transcode_packet {
 	int marker:1,
 	    ignore_seq:1;
 	int (*func)(struct codec_ssrc_handler *, struct transcode_packet *, struct media_packet *);
-	void (*dup_func)(struct codec_ssrc_handler *, struct transcode_packet *, struct media_packet *);
+	int (*dup_func)(struct codec_ssrc_handler *, struct transcode_packet *, struct media_packet *);
 	struct rtp_header rtp;
 };
 
@@ -107,7 +122,9 @@ static void __handler_shutdown(struct codec_handler *handler) {
 	handler->ssrc_handler = NULL;
 	handler->kernelize = 0;
 	handler->transcoder = 0;
+	handler->dtmf_scaler = 0;
 	handler->output_handler = handler; // reset to default
+	handler->dtmf_payload_type = -1;
 }
 
 static void __codec_handler_free(void *pp) {
@@ -123,6 +140,7 @@ static struct codec_handler *__handler_new(struct rtp_payload_type *pt) {
 	struct codec_handler *handler = g_slice_alloc0(sizeof(*handler));
 	handler->source_pt = *pt;
 	handler->output_handler = handler; // default
+	handler->dtmf_payload_type = -1;
 	return handler;
 }
 
@@ -154,7 +172,7 @@ static void __make_passthrough_ssrc(struct codec_handler *handler) {
 }
 
 static void __make_transcoder(struct codec_handler *handler, struct rtp_payload_type *dest,
-		GHashTable *output_transcoders)
+		GHashTable *output_transcoders, int dtmf_payload_type)
 {
 	assert(handler->source_pt.codec_def != NULL);
 	assert(dest->codec_def != NULL);
@@ -180,13 +198,24 @@ reset:
 	handler->dest_pt = *dest;
 	handler->func = handler_func_transcode;
 	handler->transcoder = 1;
+	if (dtmf_payload_type != -1)
+		handler->dtmf_payload_type = dtmf_payload_type;
+
+	// is this DTMF to DTMF?
+	if (dtmf_payload_type != -1 && handler->source_pt.codec_def->dtmf) {
+		ilog(LOG_DEBUG, "Created DTMF transcode context for " STR_FORMAT " -> PT %i",
+				STR_FMT(&handler->source_pt.encoding_with_params),
+				dtmf_payload_type);
+		handler->dtmf_scaler = 1;
+	}
+	else
+		ilog(LOG_DEBUG, "Created transcode context for " STR_FORMAT " -> " STR_FORMAT
+			" with DTMF output %i",
+				STR_FMT(&handler->source_pt.encoding_with_params),
+				STR_FMT(&dest->encoding_with_params), dtmf_payload_type);
 
 	handler->ssrc_hash = create_ssrc_hash_full(__ssrc_handler_transcode_new, handler);
 
-	ilog(LOG_DEBUG, "Created transcode context for " STR_FORMAT " -> " STR_FORMAT "",
-			STR_FMT(&handler->source_pt.encoding_with_params),
-			STR_FMT(&dest->encoding_with_params));
-
 check_output:;
 	// check if we have multiple decoders transcoding to the same output PT
 	struct codec_handler *output_handler = g_hash_table_lookup(output_transcoders,
@@ -242,6 +271,31 @@ static void __make_passthrough_gsl(struct codec_handler *handler, GSList **handl
 	*handlers = g_slist_prepend(*handlers, handler);
 }
 
+// only called from codec_handlers_update()
+static void __dtmf_dsp_shutdown(struct call_media *sink, int payload_type) {
+	if (!sink->codec_handlers)
+		return;
+
+	GList *list = g_hash_table_get_values(sink->codec_handlers);
+
+	for (GList *l = list; l; l = l->next) {
+		struct codec_handler *handler = l->data;
+		if (!handler->transcoder)
+			continue;
+		if (handler->dtmf_payload_type != payload_type)
+			continue;
+		if (handler->dtmf_scaler)
+			continue;
+
+		ilog(LOG_DEBUG, "Shutting down DTMF DSP for '" STR_FORMAT "' -> %i (not needed)",
+				STR_FMT(&handler->source_pt.encoding_with_params),
+				payload_type);
+		handler->dtmf_payload_type = -1;
+	}
+
+	g_list_free(list);
+}
+
 // call must be locked in W
 void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
 		const struct sdp_ng_flags *flags)
@@ -262,6 +316,10 @@ void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
 	// that the sink specified. determine this first.
 	struct rtp_payload_type *pref_dest_codec = NULL;
 	int sink_transcoding = 0;
+	// keep track of telephone-event payload types. we hash them by clock rate
+	// in case there's several of them. the clock rates of the destination
+	// codec and the telephone-event codec must match.
+	GHashTable *dtmf_sinks = g_hash_table_new(g_direct_hash, g_direct_equal);
 	for (GList *l = sink->codecs_prefs_send.head; l; l = l->next) {
 		struct rtp_payload_type *pt = l->data;
 		__ensure_codec_def(pt, sink);
@@ -285,8 +343,26 @@ void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
 		// previously enabled on the sink, but no transcoding codecs are actually present,
 		// we can disable the transcoding engine.
 		if (MEDIA_ISSET(sink, TRANSCODE)) {
-			if (!g_hash_table_lookup(receiver->codec_names_send, &pt->encoding))
+			struct rtp_payload_type *recv_pt = g_hash_table_lookup(receiver->codecs_send,
+					&pt->payload_type);
+			if (!recv_pt || rtp_payload_type_cmp(pt, recv_pt)) {
 				sink_transcoding = 1;
+				// can the sink receive RFC DTMF but the receiver can't send it?
+				if (pt->codec_def && pt->codec_def->dtmf) {
+					if (!g_hash_table_lookup(dtmf_sinks, GUINT_TO_POINTER(pt->clock_rate)))
+						g_hash_table_insert(dtmf_sinks, GUINT_TO_POINTER(pt->clock_rate),
+								pt);
+				}
+			}
+		}
+		else if (flags && flags->always_transcode) {
+			// with always-transcode, we must keep track of potential output DTMF payload
+			// types as well
+			if (pt->codec_def && pt->codec_def->dtmf) {
+				if (!g_hash_table_lookup(dtmf_sinks, GUINT_TO_POINTER(pt->clock_rate)))
+					g_hash_table_insert(dtmf_sinks, GUINT_TO_POINTER(pt->clock_rate),
+							pt);
+			}
 		}
 	}
 
@@ -295,30 +371,52 @@ void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
 	if (MEDIA_ISSET(sink, TRANSCODE)) {
 		for (GList *l = sink->codecs_prefs_recv.head; l; l = l->next) {
 			struct rtp_payload_type *pt = l->data;
-			GQueue *recv_pts = g_hash_table_lookup(receiver->codec_names_recv, &pt->encoding);
-			if (!recv_pts) {
+			struct rtp_payload_type *recv_pt = g_hash_table_lookup(receiver->codecs_send,
+					&pt->payload_type);
+			if (!recv_pt || rtp_payload_type_cmp(pt, recv_pt)) {
 				sink_transcoding = 1;
+				// can the sink receive RFC DTMF but the receiver can't send it?
+				if (pt->codec_def && pt->codec_def->dtmf) {
+					if (!g_hash_table_lookup(dtmf_sinks, GUINT_TO_POINTER(pt->clock_rate)))
+						g_hash_table_insert(dtmf_sinks, GUINT_TO_POINTER(pt->clock_rate),
+								pt);
+				}
 				continue;
 			}
 
 			// even if the receiver can receive the same codec that the sink can
 			// send, we might still have it configured as a transcoder due to
 			// always-transcode in the offer
-			for (GList *k = recv_pts->head; k; k = k->next) {
-				// XXX codec_handlers can be converted to g_direct_hash table
-				int pt_num = GPOINTER_TO_INT(k->data);
-				struct codec_handler *ch_recv =
-					g_hash_table_lookup(sink->codec_handlers, &pt_num);
-				if (!ch_recv)
-					continue;
-				if (ch_recv->transcoder) {
-					sink_transcoding = 1;
-					break;
-				}
+			// XXX codec_handlers can be converted to g_direct_hash table
+			struct codec_handler *ch_recv =
+				g_hash_table_lookup(sink->codec_handlers, &recv_pt->payload_type);
+			if (!ch_recv)
+				continue;
+			if (ch_recv->transcoder) {
+				sink_transcoding = 1;
+				break;
 			}
 		}
 	}
 
+	ilog(LOG_DEBUG, "%i DTMF sink entries", g_hash_table_size(dtmf_sinks));
+	int dtmf_payload_type = -1;
+	if (g_hash_table_size(dtmf_sinks) && pref_dest_codec) {
+		// find the telephone-event codec entry with a matching clock rate
+		struct rtp_payload_type *pt = g_hash_table_lookup(dtmf_sinks,
+				GUINT_TO_POINTER(pref_dest_codec->clock_rate));
+		if (!pt)
+			ilog(LOG_INFO, "Not transcoding PCM DTMF tones to telephone-event packets as "
+					"no payload type with a matching clock rate for '" STR_FORMAT
+					"' was found", STR_FMT(&pref_dest_codec->encoding_with_params));
+		else {
+			dtmf_payload_type = pt->payload_type;
+			ilog(LOG_DEBUG, "Output DTMF payload type is %i", dtmf_payload_type);
+		}
+	}
+
+	g_hash_table_destroy(dtmf_sinks);
+
 	// stop transcoding if we've determined that we don't need it
 	if (MEDIA_ISSET(sink, TRANSCODE) && !sink_transcoding) {
 		ilog(LOG_DEBUG, "Disabling transcoding engine (not needed)");
@@ -403,8 +501,7 @@ void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
 			// if the other side is transcoding, we may come across a receiver entry
 			// (recv->recv) that wasn't originally offered (recv->send). we must eliminate
 			// those
-			// XXX sufficient to check against payload type?
-			if (!g_hash_table_lookup(receiver->codec_names_send, &pt->encoding)) {
+			if (!g_hash_table_lookup(receiver->codecs_send, &pt->payload_type)) {
 				ilog(LOG_DEBUG, "Eliminating transcoded codec " STR_FORMAT,
 						STR_FMT(&pt->encoding_with_params));
 
@@ -452,8 +549,16 @@ void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
 		struct rtp_payload_type *dest_pt; // transcode to this
 
 		GQueue *dest_codecs = NULL;
-		if (!flags || !flags->always_transcode)
-			dest_codecs = g_hash_table_lookup(sink->codec_names_send, &pt->encoding);
+		if (!flags || !flags->always_transcode) {
+			// we ignore output codec matches if we must transcode DTMF
+			if (dtmf_payload_type == -1)
+				dest_codecs = g_hash_table_lookup(sink->codec_names_send, &pt->encoding);
+		}
+		else if (flags->always_transcode) {
+			// with always-transcode, we still accept DTMF payloads if possible
+			if (pt->codec_def && pt->codec_def->supplemental)
+				dest_codecs = g_hash_table_lookup(sink->codec_names_send, &pt->encoding);
+		}
 		if (dest_codecs) {
 			// the sink supports this codec - check offered formats
 			dest_pt = NULL;
@@ -482,6 +587,8 @@ void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
 			// XXX check format parameters as well
 			ilog(LOG_DEBUG, "Sink supports codec " STR_FORMAT, STR_FMT(&pt->encoding_with_params));
 			__make_passthrough_gsl(handler, &passthrough_handlers);
+			if (pt->codec_def && pt->codec_def->dtmf)
+				__dtmf_dsp_shutdown(sink, pt->payload_type);
 			goto next;
 		}
 
@@ -502,7 +609,7 @@ transcode:;
 				dest_pt->bitrate = reverse_pt->bitrate;
 		}
 		MEDIA_SET(receiver, TRANSCODE);
-		__make_transcoder(handler, dest_pt, output_transcoders);
+		__make_transcoder(handler, dest_pt, output_transcoders, dtmf_payload_type);
 
 next:
 		l = l->next;
@@ -539,10 +646,10 @@ next:
 			// if the sink does not support DTMF but we can receive it, we must transcode
 			// DTMF event packets to PCM. this requires all codecs to be transcoded to the
 			// sink's preferred destination codec.
-			if (!transcode_dtmf || !pref_dest_codec)
+			if ((!transcode_dtmf && dtmf_payload_type == -1) || !pref_dest_codec)
 				__make_passthrough_ssrc(handler);
 			else
-				__make_transcoder(handler, pref_dest_codec, output_transcoders);
+				__make_transcoder(handler, pref_dest_codec, output_transcoders, dtmf_payload_type);
 			passthrough_handlers = g_slist_delete_link(passthrough_handlers, passthrough_handlers);
 
 		}
@@ -724,7 +831,7 @@ static void __output_rtp(struct media_packet *mp, struct codec_ssrc_handler *ch,
 		char *buf, // malloc'd, room for rtp_header + filled-in payload
 		unsigned int payload_len,
 		unsigned long payload_ts,
-		int marker, int seq, int seq_inc)
+		int marker, int seq, int seq_inc, int payload_type)
 {
 	struct rtp_header *rh = (void *) buf;
 	struct ssrc_ctx *ssrc_out = mp->ssrc_out;
@@ -733,7 +840,9 @@ static void __output_rtp(struct media_packet *mp, struct codec_ssrc_handler *ch,
 	unsigned long ts = payload_ts;
 	ZERO(*rh);
 	rh->v_p_x_cc = 0x80;
-	rh->m_pt = handler->dest_pt.payload_type | (marker ? 0x80 : 0);
+	if (payload_type == -1)
+		payload_type = handler->dest_pt.payload_type;
+	rh->m_pt = payload_type | (marker ? 0x80 : 0);
 	if (seq != -1)
 		rh->seq_num = htons(seq);
 	else
@@ -784,17 +893,79 @@ static void __output_rtp(struct media_packet *mp, struct codec_ssrc_handler *ch,
 	atomic64_set(&ssrc_out->last_ts, ts);
 }
 
+static struct codec_ssrc_handler *__output_ssrc_handler(struct codec_ssrc_handler *ch, struct media_packet *mp) {
+	struct codec_handler *handler = ch->handler;
+	if (handler->output_handler == handler)
+		return ch;
+
+	// our encoder is in a different codec handler
+	ilog(LOG_DEBUG, "Switching context from decoder to encoder");
+	handler = handler->output_handler;
+	struct codec_ssrc_handler *new_ch = get_ssrc(mp->ssrc_in->parent->h.ssrc, handler->ssrc_hash);
+	if (G_UNLIKELY(!new_ch)) {
+		ilog(LOG_ERR, "Switched from input to output codec context, but no codec handler present");
+		return ch;
+	}
+
+	return new_ch;
+}
+
 static void packet_dtmf_fwd(struct codec_ssrc_handler *ch, struct transcode_packet *packet,
 		struct media_packet *mp, int seq_inc)
 {
+	int payload_type = -1; // take from handler's output config
+
+	if (ch->handler->dtmf_scaler) {
+		// this is actually a DTMF -> PCM handler
+		// grab our underlying PCM transcoder
+		struct codec_ssrc_handler *output_ch = __output_ssrc_handler(ch, mp);
+		// init some vars
+		if (!ch->first_ts)
+			ch->first_ts = output_ch->first_ts;
+
+		// the correct output TS is the encoder's FIFO PTS at the start of the DTMF
+		// event. however, we must shift the FIFO PTS forward as the DTMF event goes on
+		// as the DTMF event replaces the audio samples. therefore we must remember
+		// the TS at the start of the event and the last seen event duration.
+		if (ch->dtmf_ts != packet->ts) {
+			// this is a new event
+			ch->dtmf_ts = packet->ts; // start TS
+			ch->last_dtmf_event_ts = 0; // last shifted FIFO PTS
+		}
+
+		unsigned long ts = output_ch->encoder->fifo_pts;
+		// roll back TS to start of event
+		ts -= ch->last_dtmf_event_ts;
+		// adjust to output RTP TS
+		unsigned long packet_ts = ts + output_ch->first_ts;
+
+		ilog(LOG_DEBUG, "Scaling DTMF packet timestamp and duration: TS %lu -> %lu "
+				"(%u -> %u)",
+				packet->ts, packet_ts,
+				ch->handler->source_pt.clock_rate, ch->handler->dest_pt.clock_rate);
+		packet->ts = packet_ts;
+
+		if (packet->payload->len >= sizeof(struct telephone_event_payload)) {
+			struct telephone_event_payload *dtmf = (void *) packet->payload->s;
+			unsigned int duration = av_rescale(ntohs(dtmf->duration),
+					ch->handler->dest_pt.clock_rate, ch->handler->source_pt.clock_rate);
+			dtmf->duration = htons(duration);
+
+			// shift forward our output RTP TS
+			output_ch->encoder->fifo_pts = ts + duration;
+			ch->last_dtmf_event_ts = duration;
+		}
+		payload_type = ch->handler->dtmf_payload_type;
+	}
+
 	char *buf = malloc(packet->payload->len + sizeof(struct rtp_header) + RTP_BUFFER_TAIL_ROOM);
 	memcpy(buf + sizeof(struct rtp_header), packet->payload->s, packet->payload->len);
 	if (packet->ignore_seq) // inject original seq
 		__output_rtp(mp, ch, packet->handler ? : ch->handler, buf, packet->payload->len, packet->ts,
-				packet->marker, packet->p.seq, -1);
+				packet->marker, packet->p.seq, -1, payload_type);
 	else // use our own sequencing
 		__output_rtp(mp, ch, packet->handler ? : ch->handler, buf, packet->payload->len, packet->ts,
-				packet->marker, -1, seq_inc);
+				packet->marker, -1, seq_inc, payload_type);
 }
 static int packet_dtmf(struct codec_ssrc_handler *ch, struct transcode_packet *packet, struct media_packet *mp)
 {
@@ -812,11 +983,12 @@ static int packet_dtmf(struct codec_ssrc_handler *ch, struct transcode_packet *p
 		packet_dtmf_fwd(ch, packet, mp, 0);
 	return 0;
 }
-static void packet_dtmf_dup(struct codec_ssrc_handler *ch, struct transcode_packet *packet,
+static int packet_dtmf_dup(struct codec_ssrc_handler *ch, struct transcode_packet *packet,
 		struct media_packet *mp)
 {
 	if (!mp->call->block_dtmf && !mp->media->monologue->block_dtmf)
 		packet_dtmf_fwd(ch, packet, mp, 0);
+	return 0;
 }
 
 static int handler_func_dtmf(struct codec_handler *h, struct media_packet *mp) {
@@ -1003,15 +1175,33 @@ static struct ssrc_entry *__ssrc_handler_new(void *p) {
 	return &ch->h;
 }
 
+static void __dtmf_dsp_callback(void *ptr, int code, int level, int delay) {
+	struct codec_ssrc_handler *ch = ptr;
+	struct dtmf_event *ev = g_slice_alloc(sizeof(*ev));
+	*ev = (struct dtmf_event) { .code = code, .volume = level, .ts = ch->last_dtmf_event_ts + delay };
+	ch->last_dtmf_event_ts = ev->ts;
+	ev->ts = av_rescale(ev->ts, ch->encoder_format.clockrate, ch->dtmf_format.clockrate);
+	ilog(LOG_DEBUG, "DTMF event state change: code %i, volume %i, TS %lu",
+			ev->code, ev->volume, (unsigned long) ev->ts);
+	g_queue_push_tail(&ch->dtmf_events, ev);
+}
+
 static struct ssrc_entry *__ssrc_handler_transcode_new(void *p) {
 	struct codec_handler *h = p;
 
-	ilog(LOG_DEBUG, "Creating SSRC transcoder from %s/%u/%i to "
-			"%s/%u/%i",
-			h->source_pt.codec_def->rtpname, h->source_pt.clock_rate,
-			h->source_pt.channels,
-			h->dest_pt.codec_def->rtpname, h->dest_pt.clock_rate,
-			h->dest_pt.channels);
+	if (h->dtmf_scaler)
+		ilog(LOG_DEBUG, "Creating SSRC DTMF transcoder from %s/%u/%i to "
+				"PT %i",
+				h->source_pt.codec_def->rtpname, h->source_pt.clock_rate,
+				h->source_pt.channels,
+				h->dtmf_payload_type);
+	else
+		ilog(LOG_DEBUG, "Creating SSRC transcoder from %s/%u/%i to "
+				"%s/%u/%i",
+				h->source_pt.codec_def->rtpname, h->source_pt.clock_rate,
+				h->source_pt.channels,
+				h->dest_pt.codec_def->rtpname, h->dest_pt.clock_rate,
+				h->dest_pt.channels);
 
 	struct codec_ssrc_handler *ch = obj_alloc0("codec_ssrc_handler", sizeof(*ch), __free_ssrc_handler);
 	ch->handler = h;
@@ -1033,6 +1223,16 @@ static struct ssrc_entry *__ssrc_handler_transcode_new(void *p) {
 				&enc_format, &ch->encoder_format, &h->dest_pt.format_parameters))
 		goto err;
 
+	if (h->dtmf_payload_type != -1) {
+		ilog(LOG_DEBUG, "Inserting DTMF DSP for output payload type %i", h->dtmf_payload_type);
+		ch->dtmf_format = (format_t) { .clockrate = 8000, .channels = 1, .format = AV_SAMPLE_FMT_S16 };
+		ch->dtmf_dsp = dtmf_rx_init(NULL, NULL, NULL);
+		if (!ch->dtmf_dsp)
+			ilog(LOG_ERR, "Failed to allocate DTMF RX context");
+		else
+			dtmf_rx_set_realtime_callback(ch->dtmf_dsp, __dtmf_dsp_callback, ch);
+	}
+
 	ch->decoder = decoder_new_fmtp(h->source_pt.codec_def, h->source_pt.clock_rate, h->source_pt.channels,
 			&ch->encoder_format, &h->source_pt.format_parameters);
 	if (!ch->decoder)
@@ -1074,6 +1274,10 @@ static void __free_ssrc_handler(void *chp) {
 	}
 	if (ch->sample_buffer)
 		g_string_free(ch->sample_buffer, TRUE);
+	if (ch->dtmf_dsp)
+		dtmf_rx_free(ch->dtmf_dsp);
+	resample_shutdown(&ch->dtmf_resampler);
+	g_queue_clear_full(&ch->dtmf_events, dtmf_event_free);
 }
 
 static int __packet_encoded(encoder_t *enc, void *u1, void *u2) {
@@ -1089,7 +1293,8 @@ static int __packet_encoded(encoder_t *enc, void *u1, void *u2) {
 
 	while (1) {
 		// figure out how big of a buffer we need
-		unsigned int payload_len = MAX(enc->avpkt.size, ch->bytes_per_packet);
+		unsigned int payload_len = MAX(MAX(enc->avpkt.size, ch->bytes_per_packet),
+				sizeof(struct telephone_event_payload));
 		unsigned int pkt_len = sizeof(struct rtp_header) + payload_len + RTP_BUFFER_TAIL_ROOM;
 		// prepare our buffers
 		char *buf = malloc(pkt_len);
@@ -1110,12 +1315,30 @@ static int __packet_encoded(encoder_t *enc, void *u1, void *u2) {
 		}
 
 		ilog(LOG_DEBUG, "Received packet of %i bytes from packetizer", inout.len);
-		__output_rtp(mp, ch, ch->handler, buf, inout.len, ch->first_ts
-				+ enc->avpkt.pts / enc->def->clockrate_mult,
-				ch->rtp_mark ? 1 : 0, -1, 0);
-		mp->ssrc_out->parent->seq_diff++;
-		//mp->iter_out++;
-		ch->rtp_mark = 0;
+
+		unsigned int repeats = 0;
+		int is_dtmf = dtmf_event_payload(&inout, (uint64_t *) &enc->avpkt.pts, enc->avpkt.duration,
+				&ch->dtmf_event, &ch->dtmf_events);
+		if (is_dtmf == 1)
+			ch->rtp_mark = 1; // DTMF start event
+		else if (is_dtmf == 3)
+			repeats = 2; // DTMF end event
+
+		do {
+			char *send_buf = buf;
+			if (repeats > 0) {
+				// need to duplicate the payload as __output_rtp consumes it
+				send_buf = malloc(pkt_len);
+				memcpy(send_buf, buf, pkt_len);
+			}
+			__output_rtp(mp, ch, ch->handler, send_buf, inout.len, ch->first_ts
+					+ enc->avpkt.pts / enc->def->clockrate_mult,
+					ch->rtp_mark ? 1 : 0, -1, 0,
+					is_dtmf ? ch->handler->dtmf_payload_type : -1);
+			mp->ssrc_out->parent->seq_diff++;
+			//mp->iter_out++;
+			ch->rtp_mark = 0;
+		} while (repeats--);
 
 		if (ret == 0) {
 			// no more to go
@@ -1130,6 +1353,48 @@ static int __packet_encoded(encoder_t *enc, void *u1, void *u2) {
 	return 0;
 }
 
+static void __dtmf_detect(struct codec_ssrc_handler *ch, AVFrame *frame) {
+	if (!ch->dtmf_dsp)
+		return;
+	if (ch->handler->dtmf_payload_type == -1) {
+		ch->dtmf_event.code = 0;
+		return;
+	}
+
+	AVFrame *dsp_frame = resample_frame(&ch->dtmf_resampler, frame, &ch->dtmf_format);
+	if (!dsp_frame) {
+		ilog(LOG_ERR | LOG_FLAG_LIMIT, "Failed to resample audio for DTMF DSP");
+		return;
+	}
+
+	ilog(LOG_DEBUG, "DTMF detect, TS %lu -> %lu, %u -> %u samples",
+			(unsigned long) frame->pts,
+			(unsigned long) dsp_frame->pts,
+			frame->nb_samples,
+			dsp_frame->nb_samples);
+
+	if (dsp_frame->pts > ch->dtmf_ts)
+		dtmf_rx_fillin(ch->dtmf_dsp, dsp_frame->pts - ch->dtmf_ts);
+	else if (dsp_frame->pts < ch->dtmf_ts)
+		ilog(LOG_ERR | LOG_FLAG_LIMIT, "DTMF TS seems to run backwards (%lu < %lu)",
+				(unsigned long) dsp_frame->pts,
+				(unsigned long) ch->dtmf_ts);
+
+	int num_samples = dsp_frame->nb_samples;
+	int16_t *samples = (void *) dsp_frame->extended_data[0];
+	while (num_samples > 0) {
+		int ret = dtmf_rx(ch->dtmf_dsp, samples, num_samples);
+		if (ret < 0 || ret >= num_samples) {
+			ilog(LOG_ERR | LOG_FLAG_LIMIT, "DTMF DSP returned error %i", ret);
+			break;
+		}
+		samples += num_samples - ret;
+		num_samples = ret;
+	}
+	ch->dtmf_ts = dsp_frame->pts + dsp_frame->nb_samples;
+	av_frame_free(&dsp_frame);
+}
+
 static int __packet_decoded(decoder_t *decoder, AVFrame *frame, void *u1, void *u2) {
 	struct codec_ssrc_handler *ch = u1;
 	struct media_packet *mp = u2;
@@ -1138,16 +1403,8 @@ static int __packet_decoded(decoder_t *decoder, AVFrame *frame, void *u1, void *
 			(unsigned long long) frame->pts, frame->nb_samples);
 
 	// switch from input codec context to output context if necessary
-	struct codec_handler *handler = ch->handler;
-	if (handler->output_handler != handler) {
-		// our encoder is in a different codec handler
-		ilog(LOG_DEBUG, "Switching context from decoder to encoder");
-		handler = handler->output_handler;
-		struct codec_ssrc_handler *new_ch = get_ssrc(mp->ssrc_in->parent->h.ssrc, handler->ssrc_hash);
-		if (G_UNLIKELY(!new_ch)) {
-			ilog(LOG_ERR, "Switched from input to output codec context, but no codec handler present");
-			return -1;
-		}
+	struct codec_ssrc_handler *new_ch = __output_ssrc_handler(ch, mp);
+	if (new_ch != ch) {
 		// copy some essential parameters
 		if (!new_ch->first_ts)
 			new_ch->first_ts = ch->first_ts;
@@ -1155,6 +1412,8 @@ static int __packet_decoded(decoder_t *decoder, AVFrame *frame, void *u1, void *
 		ch = new_ch;
 	}
 
+	__dtmf_detect(ch, frame);
+
 	encoder_input_fifo(ch->encoder, frame, __packet_encoded, ch, mp);
 
 	av_frame_free(&frame);
@@ -1192,6 +1451,11 @@ static int handler_func_transcode(struct codec_handler *h, struct media_packet *
 	packet->rtp = *mp->rtp;
 	packet->handler = h;
 
+	if (h->dtmf_scaler) {
+		packet->func = packet_dtmf;
+		packet->dup_func = packet_dtmf_dup;
+	}
+
 	int ret = __handler_func_sequencer(mp, packet);
 
 	//ilog(LOG_DEBUG, "tc iters: in %u out %u", mp->iter_in, mp->iter_out);
@@ -1268,7 +1532,40 @@ static struct rtp_payload_type *codec_add_payload_type(const str *codec, struct
 	return pt;
 }
 
+// handle special meaning "clock rate == 1": add one instance of this PT for each clock rate
+// that is already present
+static int __codec_synth_transcode_options(struct rtp_payload_type *pt, struct sdp_ng_flags *flags,
+		struct call_media *media)
+{
+	if (pt->clock_rate != 1)
+		return 0;
+
+	struct call *call = media->call;
+	GHashTable *clockrates = g_hash_table_new(g_direct_hash, g_direct_equal);
+
+	// special handling - add one instance for each clock rate that is present
+	for (GList *k = media->codecs_prefs_recv.head; k; k = k->next) {
+		struct rtp_payload_type *pt_r = k->data;
+		if (g_hash_table_lookup(clockrates, GUINT_TO_POINTER(pt_r->clock_rate)))
+			continue;
+		char *pt_s;
+		if (asprintf(&pt_s, STR_FORMAT "/%u", STR_FMT(&pt->encoding), pt_r->clock_rate) < 0)
+			continue;
+		pt_s = call_strdup(call, pt_s);
+		// XXX optimise this -^  call buffer can probably be replaced with a gstringchunk
+		// and made lock free
+		g_hash_table_insert(clockrates, GUINT_TO_POINTER(pt_r->clock_rate), (void *) 1);
+		str pt_str;
+		str_init(&pt_str, pt_s);
+		ilog(LOG_DEBUG, "Synthesised transcoding option for '%s'", pt_s);
+		g_queue_push_tail(&flags->codec_transcode, str_slice_dup(&pt_str));
+	}
 
+	payload_type_free(pt);
+	g_hash_table_destroy(clockrates);
+
+	return 1;
+}
 
 
 #endif
@@ -1384,7 +1681,7 @@ static void __codec_options_set(struct rtp_payload_type *pt, GHashTable *codec_s
 		return;
 }
 void codec_rtp_payload_types(struct call_media *media, struct call_media *other_media,
-		GQueue *types, const struct sdp_ng_flags *flags)
+		GQueue *types, struct sdp_ng_flags *flags)
 {
 	if (!flags)
 		return;
@@ -1480,11 +1777,13 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
 		if (!pt)
 			continue;
 
+		if (__codec_synth_transcode_options(pt, flags, media))
+			continue;
+
 		ilog(LOG_DEBUG, "Codec '" STR_FORMAT "' added for transcoding with payload type %u",
 				STR_FMT(&pt->encoding_with_params), pt->payload_type);
 		__rtp_payload_type_add_recv(media, pt);
 	}
-
 #endif
 
 	g_hash_table_destroy(removed);
diff --git a/daemon/dtmf.c b/daemon/dtmf.c
index 6019bcd21..71c277dcf 100644
--- a/daemon/dtmf.c
+++ b/daemon/dtmf.c
@@ -71,3 +71,72 @@ int dtmf_event(struct media_packet *mp, str *payload, int clockrate) {
 
 	return ret;
 }
+
+void dtmf_event_free(void *e) {
+	g_slice_free1(sizeof(struct dtmf_event), e);
+}
+
+// returns: 0 = no DTMF. 1 = DTMF start event. 2 = DTMF in progress. 3 = DTMF end event.
+int dtmf_event_payload(str *buf, uint64_t *pts, uint64_t duration, struct dtmf_event *cur_event, GQueue *events) {
+	// do we have a relevant state change?
+	struct dtmf_event prev_event = *cur_event;
+	while (events->length) {
+		struct dtmf_event *ev = g_queue_peek_head(events);
+		ilog(LOG_DEBUG, "Next DTMF event starts at %lu. PTS now %li", (unsigned long) ev->ts,
+				(unsigned long) *pts);
+		if (ev->ts > *pts)
+			break; // future event
+
+		ilog(LOG_DEBUG, "DTMF state change at %lu: %i -> %i, duration %lu", (unsigned long) ev->ts,
+				cur_event->code, ev->code, (unsigned long) duration);
+		g_queue_pop_head(events);
+		*cur_event = *ev;
+		dtmf_event_free(ev);
+		cur_event->ts = *pts; // canonicalise start TS
+	}
+
+	int ret = 2; // normal: in progress
+	if (cur_event->code == 0) {
+		if (prev_event.code == 0)
+			return 0;
+		// state change from DTMF back to audio. send DTMF end code.
+		ret = 3;
+		cur_event = &prev_event;
+	}
+	else if (prev_event.code == 0)
+		ret = 1; // start event
+
+	int dtmf_code = -1;
+	if (cur_event->code >= '0' && cur_event->code <= '9')
+		dtmf_code = cur_event->code - '0';
+	else if (cur_event->code == '*')
+		dtmf_code = 10;
+	else if (cur_event->code == '#')
+		dtmf_code = 11;
+	else if (cur_event->code >= 'A' && cur_event->code <= 'D')
+		dtmf_code = cur_event->code - 'A' + 12;
+	else {
+		ilog(LOG_ERR | LOG_FLAG_LIMIT, "Unknown DTMF event code %i", cur_event->code);
+		return 0;
+	}
+
+	// replace audio RTP frame with DTMF payload
+	struct telephone_event_payload *ev_pt = (void *) buf->s;
+	buf->len = sizeof(*ev_pt);
+	ZERO(*ev_pt);
+
+	ev_pt->event = dtmf_code;
+	if (cur_event->volume > 0)
+		ev_pt->volume = 0;
+	else if (cur_event->volume >= -63)
+		ev_pt->volume = -1 * cur_event->volume;
+	else
+		ev_pt->volume = 63;
+	ev_pt->end = (ret == 3) ? 1 : 0;
+	ev_pt->duration = htons(*pts - cur_event->ts + duration);
+
+	// fix up timestamp
+	*pts = cur_event->ts;
+
+	return ret;
+}
diff --git a/debian/control b/debian/control
index c1649416f..71bc89292 100644
--- a/debian/control
+++ b/debian/control
@@ -32,6 +32,7 @@ Build-Depends:
  libpcap0.8-dev,
  libpcre3-dev,
  libsocket6-perl,
+ libspandsp-dev,
  libssl-dev (>= 1.0.1),
  libswresample-dev (>= 6:10),
  libsystemd-dev,
diff --git a/include/call.h b/include/call.h
index 106b5bc14..37538405c 100644
--- a/include/call.h
+++ b/include/call.h
@@ -417,7 +417,7 @@ struct call *call_get_opmode(const str *callid, enum call_opmode opmode);
 struct call_monologue *call_get_mono_dialogue(struct call *call, const str *fromtag, const str *totag,
 		const str *viabranch);
 struct call *call_get(const str *callid);
-int monologue_offer_answer(struct call_monologue *monologue, GQueue *streams, const struct sdp_ng_flags *flags);
+int monologue_offer_answer(struct call_monologue *monologue, GQueue *streams, struct sdp_ng_flags *flags);
 int call_delete_branch(const str *callid, const str *branch,
 	const str *fromtag, const str *totag, bencode_item_t *output, int delete_delay);
 void call_destroy(struct call *);
diff --git a/include/codec.h b/include/codec.h
index 49f06f65b..7c5fde770 100644
--- a/include/codec.h
+++ b/include/codec.h
@@ -25,9 +25,11 @@ typedef int codec_handler_func(struct codec_handler *, struct media_packet *);
 struct codec_handler {
 	struct rtp_payload_type source_pt; // source_pt.payload_type = hashtable index
 	struct rtp_payload_type dest_pt;
+	int dtmf_payload_type;
 	codec_handler_func *func;
 	int kernelize:1;
 	int transcoder:1;
+	int dtmf_scaler:1;
 
 	struct ssrc_hash *ssrc_hash;
 	struct codec_handler *output_handler; // == self, or other PT handler
@@ -55,7 +57,7 @@ void codec_add_raw_packet(struct media_packet *mp);
 void codec_packet_free(void *);
 
 void codec_rtp_payload_types(struct call_media *media, struct call_media *other_media,
-		GQueue *types, const struct sdp_ng_flags *flags);
+		GQueue *types, struct sdp_ng_flags *flags);
 
 // special return value `(void *) 0x1` to signal type mismatch
 struct rtp_payload_type *codec_make_payload_type(const str *codec_str, struct call_media *media);
diff --git a/include/dtmf.h b/include/dtmf.h
index 935514212..a2b9bf660 100644
--- a/include/dtmf.h
+++ b/include/dtmf.h
@@ -1,12 +1,22 @@
 #ifndef _DTMF_H_
 #define _DTMF_H_
 
+#include <inttypes.h>
+#include <glib.h>
 #include "str.h"
 
 
 struct media_packet;
 
+struct dtmf_event {
+	int code;
+	int volume;
+	uint64_t ts;
+};
+
 int dtmf_event(struct media_packet *, str *, int);
+int dtmf_event_payload(str *, uint64_t *, uint64_t, struct dtmf_event *, GQueue *);
+void dtmf_event_free(void *);
 
 
 #endif
diff --git a/lib/codeclib.c b/lib/codeclib.c
index 296f6def5..86fc1130c 100644
--- a/lib/codeclib.c
+++ b/lib/codeclib.c
@@ -57,6 +57,9 @@ static int amr_decoder_input(decoder_t *dec, const str *data, GQueue *out);
 
 static const char *dtmf_decoder_init(decoder_t *, const str *);
 static int dtmf_decoder_input(decoder_t *dec, const str *data, GQueue *out);
+static const char *dtmf_encoder_init(encoder_t *enc, const str *);
+static int dtmf_encoder_input(encoder_t *enc, AVFrame **frame);
+static void dtmf_encoder_close(encoder_t *enc);
 
 
 
@@ -82,6 +85,9 @@ static const codec_type_t codec_type_amr = {
 static const codec_type_t codec_type_dtmf = {
 	.decoder_init = dtmf_decoder_init,
 	.decoder_input = dtmf_decoder_input,
+	.encoder_init = dtmf_encoder_init,
+	.encoder_input = dtmf_encoder_input,
+	.encoder_close = dtmf_encoder_close,
 };
 
 #ifdef HAVE_BCG729
@@ -350,7 +356,7 @@ static codec_def_t __codec_defs[] = {
 		.media_type = MT_AUDIO,
 		.supplemental = 1,
 		.dtmf = 1,
-		.default_clockrate = 8000,
+		.default_clockrate = 1, // special handling
 		.default_channels = 1,
 		.default_fmtp = "0-15",
 		.codec_type = &codec_type_dtmf,
@@ -1785,3 +1791,14 @@ static int dtmf_decoder_input(decoder_t *dec, const str *data, GQueue *out) {
 
 	return 0;
 }
+
+static const char *dtmf_encoder_init(encoder_t *enc, const str *fmtp) {
+	return NULL;
+}
+
+static int dtmf_encoder_input(encoder_t *enc, AVFrame **frame) {
+	return 0;
+}
+
+static void dtmf_encoder_close(encoder_t *enc) {
+}
diff --git a/t/.gitignore b/t/.gitignore
index cef8a1293..0adddf88d 100644
--- a/t/.gitignore
+++ b/t/.gitignore
@@ -49,3 +49,4 @@ tests-preload.so
 timerthread.c
 media_player.c
 dtmflib.c
+test-dtmf-detect
diff --git a/t/Makefile b/t/Makefile
index 253330b9f..effb90920 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -16,6 +16,7 @@ CFLAGS+=	$(shell pkg-config --cflags libavformat)
 CFLAGS+=	$(shell pkg-config --cflags libavutil)
 CFLAGS+=	$(shell pkg-config --cflags libswresample)
 CFLAGS+=	$(shell pkg-config --cflags libavfilter)
+CFLAGS+=	$(shell pkg-config --cflags spandsp)
 CFLAGS+=	-DWITH_TRANSCODING
 CFLAGS+=	$(shell pkg-config --cflags zlib)
 CFLAGS+=	$(shell pkg-config --cflags json-glib-1.0)
@@ -43,6 +44,7 @@ LDLIBS+=	$(shell pkg-config --libs libavformat)
 LDLIBS+=	$(shell pkg-config --libs libavutil)
 LDLIBS+=	$(shell pkg-config --libs libswresample)
 LDLIBS+=	$(shell pkg-config --libs libavfilter)
+LDLIBS+=	$(shell pkg-config --libs spandsp)
 LDLIBS+=	$(shell pkg-config --libs zlib)
 LDLIBS+=	$(shell pkg-config --libs json-glib-1.0)
 LDLIBS+=	-lpcap
@@ -60,7 +62,7 @@ DAEMONSRCS=	crypto.c ssrc.c aux.c rtp.c
 HASHSRCS=
 
 ifeq ($(with_transcoding),yes)
-SRCS+=		transcode-test.c
+SRCS+=		transcode-test.c test-dtmf-detect.c
 ifeq ($(with_amr_tests),yes)
 SRCS+=		amr-decode-test.c amr-encode-test.c
 endif
@@ -84,7 +86,7 @@ include		.depend
 
 TESTS=		bitstr-test aes-crypt payload-tracker-test const_str_hash-test.strhash
 ifeq ($(with_transcoding),yes)
-TESTS+=		transcode-test
+TESTS+=		transcode-test test-dtmf-detect
 ifeq ($(with_amr_tests),yes)
 TESTS+=		amr-decode-test amr-encode-test
 endif
@@ -113,6 +115,8 @@ amr-decode-test: amr-decode-test.o $(COMMONOBJS) codeclib.o resample.o dtmflib.o
 
 amr-encode-test: amr-encode-test.o $(COMMONOBJS) codeclib.o resample.o dtmflib.o
 
+test-dtmf-detect: test-dtmf-detect.o
+
 aes-crypt:	aes-crypt.o $(COMMONOBJS) crypto.o
 
 transcode-test:	transcode-test.o $(COMMONOBJS) codeclib.o resample.o codec.o ssrc.o call.o ice.o aux.o \
diff --git a/t/auto-daemon-tests.pl b/t/auto-daemon-tests.pl
index 00b4f221b..dd12e10a2 100755
--- a/t/auto-daemon-tests.pl
+++ b/t/auto-daemon-tests.pl
@@ -2968,6 +2968,26 @@ snd($sock_a, $port_b,  rtp(0, 1000, 3000, 0x1234, "\x00" x 160));
 ($seq, $ssrc) = rcv($sock_b, $port_a, rtpm(0, -1, 3000, -1, "\x00" x 160));
 snd($sock_a, $port_b,  rtp(0, 1001, 3160, 0x1234, "\x00" x 160));
 rcv($sock_b, $port_a, rtpm(0, $seq+1, 3160, $ssrc, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(0, 1002, 3000+160*2, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+# DTMF not detected yet
+rcv($sock_b, $port_a, rtpm(0, $seq+2, 3000+160*2, $ssrc, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+snd($sock_a, $port_b,  rtp(0, 1003, 3000+160*3, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+# DTMF detection kicking in mid-frame
+rcv($sock_b, $port_a, rtpm(0, $seq+3, 3000+160*3, $ssrc, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+snd($sock_a, $port_b,  rtp(0, 1004, 3000+160*4, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+# DTMF detected now
+rcv($sock_b, $port_a, rtpm(96 | 0x80, $seq+4, 3000+160*4, $ssrc, "\x08\x0f\x00\xa0")); # start event 8, vol -15, duration 160
+snd($sock_a, $port_b,  rtp(0, 1005, 3000+160*5, 0x1234, "\x00" x 160));
+# reverting to audio, but DTMF event still progressing
+rcv($sock_b, $port_a, rtpm(96, $seq+5, 3000+160*4, $ssrc, "\x08\x0f\x01\x40")); # event 8, vol -15, duration 320
+snd($sock_a, $port_b,  rtp(0, 1006, 3000+160*6, 0x1234, "\x00" x 160));
+# end event, 3 times
+rcv($sock_b, $port_a, rtpm(96, $seq+6, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+rcv($sock_b, $port_a, rtpm(96, $seq+7, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+rcv($sock_b, $port_a, rtpm(96, $seq+8, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+# audio passing through again
+snd($sock_a, $port_b,  rtp(0, 1007, 3000+160*7, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(0, $seq+9, 3000+160*7, $ssrc, "\x00" x 160));
 
 snd($sock_b, $port_a,  rtp(0, 2000, 4000, 0x5678, "\x00" x 160));
 ($seq, $ssrc) = rcv($sock_a, $port_b, rtpm(0, -1, 4000, -1, "\x00" x 160));
@@ -3045,10 +3065,30 @@ a=sendrecv
 a=rtcp:PORT
 SDP
 
-snd($sock_a, $port_b,  rtp(0, 1000, 3000, 0x1234, "\x00" x 160));
-($seq, $ssrc) = rcv($sock_b, $port_a, rtpm(8, -1, 3000, -1, "\x2a" x 160));
-snd($sock_a, $port_b,  rtp(0, 1001, 3160, 0x1234, "\x00" x 160));
-rcv($sock_b, $port_a, rtpm(8, $seq+1, 3160, $ssrc, "\x2a" x 160));
+snd($sock_a, $port_b,  rtp(0, 1000, 3000+160*0, 0x1234, "\x00" x 160));
+($seq, $ssrc) = rcv($sock_b, $port_a, rtpm(8, -1, 3000+160*0, -1, "\x2a" x 160));
+snd($sock_a, $port_b,  rtp(0, 1001, 3000+160*1, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(8, $seq+1, 3000+160*1, $ssrc, "\x2a" x 160));
+snd($sock_a, $port_b,  rtp(0, 1002, 3000+160*2, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+# DTMF not detected yet
+rcv($sock_b, $port_a, rtpm(8, $seq+2, 3000+160*2, $ssrc, "\xd5\x9b\x87\x97\x64\x10\x6b\x41\xdc\x73\x66\xd1\x91\x9a\x97\x6d\x07\x04\x67\x91\x9a\x96\x5c\x60\x7d\xd3\x4d\x6b\x11\x7c\x91\x87\x9e\x4f\x1a\x04\x15\xe0\x93\xe8\xda\x59\xf1\xe4\x44\x10\x1b\x6b\xeb\x87\x85\xfc\x12\x1a\x17\xc3\xe2\xfc\x51\xc9\xeb\x96\xcb\x13\x07\x1c\xff\x85\x84\xee\x6f\x12\x68\x5c\xc5\x76\x7b\xc9\x93\x98\xef\x14\x06\x1a\x4f\x9c\x9a\x95\x77\x6c\x7f\xd7\x75\x6b\x14\x59\x9d\x87\x93\x66\x04\x04\x63\xeb\x9d\xe9\xd7\x41\xf4\xff\x71\x12\x19\x61\x91\x86\x9b\xd5\x1e\x1a\x68\xfc\xee\xff\x55\xf4\xeb\x95\x53\x1c\x04\x11\xec\x87\x85\xe5\x14\x1d\x6f\xd1\xcd\x4b\x73\xfc\x92\x9f\xfb\x12\x06\x19\xcd\x98\x9a\xef\x65\x69\x7e\x55\x77\x68"));
+snd($sock_a, $port_b,  rtp(0, 1003, 3000+160*3, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+# DTMF detection kicking in mid-frame
+rcv($sock_b, $port_a, rtpm(8, $seq+3, 3000+160*3, $ssrc, "\x68\xc2\x9e\x84\x94\x6b\x07\x1a\x72\x96\x9c\xec\x59\x49\xcf\xf7\x7b\x12\x1c\x76\x9c\x86\x9f\x7c\x1a\x1a\x63\xe6\xeb\xfe\xd5\xf6\xe9\xef\x71\x19\x05\x68\x97\x86\x9b\xc2\x10\x1c\x62\xc1\xf5\x43\x49\xe4\x92\x92\xda\x1e\x06\x12\xe7\x85\x9b\xe7\x62\x6b\x7e\x55\x76\x69\x62\xf9\x98\x85\xe2\x10\x06\x18\x54\x92\x9c\xe0\x49\x76\xc7\xc3\x66\x12\x13\xd3\x98\x86\x91\x6c\x05\x1b\x79\xef\x95\xff\x54\xf6\xef\xe1\x67\x1b\x1a\x64\x9d\x86\x9e\x43\x1c\x1c\x67\xf6\xf0\x5a\x5a\xe0\x92\x91\x49\x1b\x07\x17\xeb\x84\x98\xf6\x68\x15\x7c\xd7\x76\x6c\x64\xe0\x9b\x9b\xf0\x1f\x06\x1c\xf3\x9e\x9c\xe5\x72\x72\xde\xdd\x63\x12\x17\xfd\x9a\x87\xe8\x17\x04\x1e\x41\x95"));
+snd($sock_a, $port_b,  rtp(0, 1004, 3000+160*4, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+# DTMF detected now
+rcv($sock_b, $port_a, rtpm(96 | 0x80, $seq+4, 3000+160*4, $ssrc, "\x08\x0f\x00\xa0")); # start event 8, vol -15, duration 160
+snd($sock_a, $port_b,  rtp(0, 1005, 3000+160*5, 0x1234, "\x00" x 160));
+# reverting to audio, but DTMF event still progressing
+rcv($sock_b, $port_a, rtpm(96, $seq+5, 3000+160*4, $ssrc, "\x08\x0f\x01\x40")); # event 8, vol -15, duration 320
+snd($sock_a, $port_b,  rtp(0, 1006, 3000+160*6, 0x1234, "\x00" x 160));
+# end event, 3 times
+rcv($sock_b, $port_a, rtpm(96, $seq+6, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+rcv($sock_b, $port_a, rtpm(96, $seq+7, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+rcv($sock_b, $port_a, rtpm(96, $seq+8, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+# audio passing through again
+snd($sock_a, $port_b,  rtp(0, 1007, 3000+160*7, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(8, $seq+9, 3000+160*7, $ssrc, "\x2a" x 160));
 
 snd($sock_b, $port_a,  rtp(8, 2000, 4000, 0x5678, "\x2a" x 160));
 ($seq, $ssrc) = rcv($sock_a, $port_b, rtpm(0, -1, 4000, -1, "\x00" x 160));
@@ -3124,6 +3164,26 @@ snd($sock_a, $port_b,  rtp(0, 1000, 3000, 0x1234, "\x00" x 160));
 ($seq, $ssrc) = rcv($sock_b, $port_a, rtpm(8, -1, 3000, -1, "\x2a" x 160));
 snd($sock_a, $port_b,  rtp(0, 1001, 3160, 0x1234, "\x00" x 160));
 rcv($sock_b, $port_a, rtpm(8, $seq+1, 3160, $ssrc, "\x2a" x 160));
+snd($sock_a, $port_b,  rtp(0, 1002, 3000+160*2, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+# DTMF not detected yet
+rcv($sock_b, $port_a, rtpm(8, $seq+2, 3000+160*2, $ssrc, "\xd5\x9b\x87\x97\x64\x10\x6b\x41\xdc\x73\x66\xd1\x91\x9a\x97\x6d\x07\x04\x67\x91\x9a\x96\x5c\x60\x7d\xd3\x4d\x6b\x11\x7c\x91\x87\x9e\x4f\x1a\x04\x15\xe0\x93\xe8\xda\x59\xf1\xe4\x44\x10\x1b\x6b\xeb\x87\x85\xfc\x12\x1a\x17\xc3\xe2\xfc\x51\xc9\xeb\x96\xcb\x13\x07\x1c\xff\x85\x84\xee\x6f\x12\x68\x5c\xc5\x76\x7b\xc9\x93\x98\xef\x14\x06\x1a\x4f\x9c\x9a\x95\x77\x6c\x7f\xd7\x75\x6b\x14\x59\x9d\x87\x93\x66\x04\x04\x63\xeb\x9d\xe9\xd7\x41\xf4\xff\x71\x12\x19\x61\x91\x86\x9b\xd5\x1e\x1a\x68\xfc\xee\xff\x55\xf4\xeb\x95\x53\x1c\x04\x11\xec\x87\x85\xe5\x14\x1d\x6f\xd1\xcd\x4b\x73\xfc\x92\x9f\xfb\x12\x06\x19\xcd\x98\x9a\xef\x65\x69\x7e\x55\x77\x68"));
+snd($sock_a, $port_b,  rtp(0, 1003, 3000+160*3, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+# DTMF detection kicking in mid-frame
+rcv($sock_b, $port_a, rtpm(8, $seq+3, 3000+160*3, $ssrc, "\x68\xc2\x9e\x84\x94\x6b\x07\x1a\x72\x96\x9c\xec\x59\x49\xcf\xf7\x7b\x12\x1c\x76\x9c\x86\x9f\x7c\x1a\x1a\x63\xe6\xeb\xfe\xd5\xf6\xe9\xef\x71\x19\x05\x68\x97\x86\x9b\xc2\x10\x1c\x62\xc1\xf5\x43\x49\xe4\x92\x92\xda\x1e\x06\x12\xe7\x85\x9b\xe7\x62\x6b\x7e\x55\x76\x69\x62\xf9\x98\x85\xe2\x10\x06\x18\x54\x92\x9c\xe0\x49\x76\xc7\xc3\x66\x12\x13\xd3\x98\x86\x91\x6c\x05\x1b\x79\xef\x95\xff\x54\xf6\xef\xe1\x67\x1b\x1a\x64\x9d\x86\x9e\x43\x1c\x1c\x67\xf6\xf0\x5a\x5a\xe0\x92\x91\x49\x1b\x07\x17\xeb\x84\x98\xf6\x68\x15\x7c\xd7\x76\x6c\x64\xe0\x9b\x9b\xf0\x1f\x06\x1c\xf3\x9e\x9c\xe5\x72\x72\xde\xdd\x63\x12\x17\xfd\x9a\x87\xe8\x17\x04\x1e\x41\x95"));
+snd($sock_a, $port_b,  rtp(0, 1004, 3000+160*4, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+# DTMF detected now
+rcv($sock_b, $port_a, rtpm(96 | 0x80, $seq+4, 3000+160*4, $ssrc, "\x08\x0f\x00\xa0")); # start event 8, vol -15, duration 160
+snd($sock_a, $port_b,  rtp(0, 1005, 3000+160*5, 0x1234, "\x00" x 160));
+# reverting to audio, but DTMF event still progressing
+rcv($sock_b, $port_a, rtpm(96, $seq+5, 3000+160*4, $ssrc, "\x08\x0f\x01\x40")); # event 8, vol -15, duration 320
+snd($sock_a, $port_b,  rtp(0, 1006, 3000+160*6, 0x1234, "\x00" x 160));
+# end event, 3 times
+rcv($sock_b, $port_a, rtpm(96, $seq+6, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+rcv($sock_b, $port_a, rtpm(96, $seq+7, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+rcv($sock_b, $port_a, rtpm(96, $seq+8, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); # end event 8, vol -15, duration 480
+# audio passing through again
+snd($sock_a, $port_b,  rtp(0, 1007, 3000+160*7, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(8, $seq+9, 3000+160*7, $ssrc, "\x2a" x 160));
 
 snd($sock_b, $port_a,  rtp(8, 2000, 4000, 0x5678, "\x2a" x 160));
 ($seq, $ssrc) = rcv($sock_a, $port_b, rtpm(0, -1, 4000, -1, "\x00" x 160));
@@ -3144,6 +3204,319 @@ rcv($sock_a, $port_b, rtpm(0, $seq+5, 4000+800, $ssrc, "\x00" x 160));
 
 
 
+# test telephone-event synth options
+
+new_call;
+
+offer('several clock rates input w/ transcode DTMF',
+	{ ICE => 'remove', replace => ['origin'],
+	codec => { transcode => ['telephone-event'] } }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.1
+s=tester
+t=0 0
+m=audio 2000 RTP/AVP 0 96 8 97 9
+c=IN IP4 198.51.100.1
+a=rtpmap:96 opus/48000
+a=rtpmap:8 PCMA/8000
+a=rtpmap:97 speex/16000
+a=sendrecv
+----------------------------------
+v=0
+o=- 1545997027 1 IN IP4 203.0.113.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 0 96 8 97 9 98 99 100
+c=IN IP4 203.0.113.1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:96 opus/48000
+a=rtpmap:8 PCMA/8000
+a=rtpmap:97 speex/16000
+a=rtpmap:9 G722/8000
+a=rtpmap:98 telephone-event/8000
+a=rtpmap:99 telephone-event/48000
+a=rtpmap:100 telephone-event/16000
+a=fmtp:98 0-15
+a=fmtp:99 0-15
+a=fmtp:100 0-15
+a=sendrecv
+a=rtcp:PORT
+SDP
+
+
+
+
+($sock_a, $sock_b) = new_call([qw(198.51.100.1 7050)], [qw(198.51.100.3 7052)]);
+
+($port_a) = offer('reverse DTMF transcoding - no-op', { ICE => 'remove', replace => ['origin'],
+	flags => ['always transcode'] }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.1
+s=tester
+t=0 0
+m=audio 7050 RTP/AVP 0 101
+c=IN IP4 198.51.100.1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-15
+a=sendrecv
+----------------------------------
+v=0
+o=- 1545997027 1 IN IP4 203.0.113.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 0 101
+c=IN IP4 203.0.113.1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-15
+a=sendrecv
+a=rtcp:PORT
+SDP
+
+($port_b) = answer('reverse DTMF transcoding - no-op', { replace => ['origin'] }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.3
+s=tester
+t=0 0
+m=audio 7052 RTP/AVP 0 101
+c=IN IP4 198.51.100.3
+a=rtpmap:0 PCMU/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-15
+a=sendrecv
+--------------------------------------
+v=0
+o=- 1545997027 1 IN IP4 203.0.113.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 0 101
+c=IN IP4 203.0.113.1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-15
+a=sendrecv
+a=rtcp:PORT
+SDP
+
+snd($sock_a, $port_b,  rtp(0, 1000, 3000, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(0, 1000, 3000, 0x1234, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(0, 1001, 3160, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(0, 1001, 3160, 0x1234, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(0, 1002, 3000+160*2, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+rcv($sock_b, $port_a, rtpm(0, 1002, 3000+160*2, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+snd($sock_a, $port_b,  rtp(0, 1003, 3000+160*3, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+rcv($sock_b, $port_a, rtpm(0, 1003, 3000+160*3, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+snd($sock_a, $port_b,  rtp(0, 1004, 3000+160*4, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+rcv($sock_b, $port_a, rtpm(0, 1004, 3000+160*4, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+snd($sock_a, $port_b,  rtp(0, 1005, 3000+160*5, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(0, 1005, 3000+160*5, 0x1234, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(0, 1006, 3000+160*6, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(0, 1006, 3000+160*6, 0x1234, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(101 | 0x80, 1007, 3000+160*7, 0x1234, "\x08\x10\x00\xa0"));
+rcv($sock_b, $port_a, rtpm(101 | 0x80, 1007, 3000+160*7, 0x1234, "\x08\x10\x00\xa0"));
+
+snd($sock_b, $port_a,  rtp(0, 1000, 3000, 0x3456, "\x00" x 160));
+($ssrc) = rcv($sock_a, $port_b, rtpm(0, 1000, 3000, -1, "\x00" x 160));
+snd($sock_b, $port_a,  rtp(0, 1001, 3160, 0x3456, "\x00" x 160));
+rcv($sock_a, $port_b, rtpm(0, 1001, 3160, $ssrc, "\x00" x 160));
+snd($sock_b, $port_a,  rtp(0, 1002, 3000+160*2, 0x3456, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+rcv($sock_a, $port_b, rtpm(0, 1002, 3000+160*2, $ssrc, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+snd($sock_b, $port_a,  rtp(0, 1003, 3000+160*3, 0x3456, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+rcv($sock_a, $port_b, rtpm(0, 1003, 3000+160*3, $ssrc, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+snd($sock_b, $port_a,  rtp(0, 1004, 3000+160*4, 0x3456, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+rcv($sock_a, $port_b, rtpm(0, 1004, 3000+160*4, $ssrc, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+snd($sock_b, $port_a,  rtp(0, 1005, 3000+160*5, 0x3456, "\x00" x 160));
+rcv($sock_a, $port_b, rtpm(0, 1005, 3000+160*5, $ssrc, "\x00" x 160));
+snd($sock_b, $port_a,  rtp(0, 1006, 3000+160*6, 0x3456, "\x00" x 160));
+rcv($sock_a, $port_b, rtpm(0, 1006, 3000+160*6, $ssrc, "\x00" x 160));
+snd($sock_b, $port_a,  rtp(101 | 0x80, 1007, 3000+160*7, 0x3456, "\x08\x10\x00\xa0"));
+rcv($sock_a, $port_b, rtpm(101 | 0x80, 1007, 3000+160*7, $ssrc, "\x08\x10\x00\xa0"));
+
+
+
+
+($sock_a, $sock_b) = new_call([qw(198.51.100.1 7050)], [qw(198.51.100.3 7052)]);
+
+($port_a) = offer('reverse DTMF transcoding - active', { ICE => 'remove', replace => ['origin'],
+	flags => ['always transcode'] }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.1
+s=tester
+t=0 0
+m=audio 7050 RTP/AVP 0 101
+c=IN IP4 198.51.100.1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-15
+a=sendrecv
+----------------------------------
+v=0
+o=- 1545997027 1 IN IP4 203.0.113.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 0 101
+c=IN IP4 203.0.113.1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-15
+a=sendrecv
+a=rtcp:PORT
+SDP
+
+($port_b) = answer('reverse DTMF transcoding - active', { replace => ['origin'] }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.3
+s=tester
+t=0 0
+m=audio 7052 RTP/AVP 0
+c=IN IP4 198.51.100.3
+a=rtpmap:0 PCMU/8000
+a=fmtp:101 0-15
+a=sendrecv
+--------------------------------------
+v=0
+o=- 1545997027 1 IN IP4 203.0.113.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 0 101
+c=IN IP4 203.0.113.1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-15
+a=sendrecv
+a=rtcp:PORT
+SDP
+
+snd($sock_a, $port_b,  rtp(0, 1000, 3000, 0x1234, "\x00" x 160));
+($seq, $ssrc) = rcv($sock_b, $port_a, rtpm(0, -1, 3000, -1, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(0, 1001, 3160, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(0, $seq+1, 3160, $ssrc, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(0, 1002, 3000+160*2, 0x1234, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+rcv($sock_b, $port_a, rtpm(0, $seq+2, 3000+160*2, $ssrc, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+snd($sock_a, $port_b,  rtp(0, 1003, 3000+160*3, 0x1234, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+rcv($sock_b, $port_a, rtpm(0, $seq+3, 3000+160*3, $ssrc, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+snd($sock_a, $port_b,  rtp(0, 1004, 3000+160*4, 0x1234, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+rcv($sock_b, $port_a, rtpm(0, $seq+4, 3000+160*4, $ssrc, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+snd($sock_a, $port_b,  rtp(0, 1005, 3000+160*5, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(0, $seq+5, 3000+160*5, $ssrc, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(0, 1006, 3000+160*6, 0x1234, "\x00" x 160));
+rcv($sock_b, $port_a, rtpm(0, $seq+6, 3000+160*6, $ssrc, "\x00" x 160));
+snd($sock_a, $port_b,  rtp(101 | 0x80, 1007, 3000+160*7, 0x1234, "\x08\x10\x00\xa0"));
+rcv($sock_b, $port_a, rtpm(0, $seq+7, 3000+160*7, $ssrc, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+
+snd($sock_b, $port_a,  rtp(0, 1000, 3000, 0x3456, "\x00" x 160));
+($seq, $ssrc) = rcv($sock_a, $port_b, rtpm(0, -1, 3000, -1, "\x00" x 160));
+snd($sock_b, $port_a,  rtp(0, 1001, 3160, 0x3456, "\x00" x 160));
+rcv($sock_a, $port_b, rtpm(0, $seq+1, 3160, $ssrc, "\x00" x 160));
+snd($sock_b, $port_a,  rtp(0, 1002, 3000+160*2, 0x3456, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+# DTMF not detected yet
+rcv($sock_a, $port_b, rtpm(0, $seq+2, 3000+160*2, $ssrc, "\xff\xb0\xac\xbc\x4c\x39\x3f\x63\xee\x55\x4a\xf6\xba\xaf\xbc\x45\x2c\x2d\x4b\xba\xaf\xbb\x6e\x48\x53\xf3\x5f\x3f\x3a\x52\xba\xac\xb3\x5e\x2f\x2d\x3e\xc8\xb8\xc0\xe8\x6b\xd7\xcc\x66\x39\x30\x3f\xbf\xac\xae\xd2\x37\x2f\x3c\xe1\xc6\xd2\x77\xdd\xbf\xbb\xdc\x38\x2c\x35\xd1\xae\xad\xc2\x43\x37\x40\x6e\xe7\x58\x4e\xdd\xb8\xb1\xc3\x3d\x2b\x2f\x5e\xb5\xaf\xbe\x59\x44\x51\xfb\x5b\x3f\x3d\x6b\xb6\xac\xb8\x4a\x2d\x2d\x47\xbf\xb6\xc1\xfa\x63\xda\xd1\x57\x37\x32\x49\xba\xab\xb0\xfe\x33\x2f\x40\xd2\xc2\xd1\x7e\xda\xbf\xbe\x73\x35\x2d\x3a\xc4\xac\xae\xcd\x3d\x36\x43\xf6\xdf\x5c\x55\xd2\xb7\xb4\xce\x37\x2b\x32\xdf\xb1\xaf\xc3\x4d\x41\x50\x7e\x59\x40"));
+snd($sock_b, $port_a,  rtp(0, 1003, 3000+160*3, 0x3456, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+# DTMF detection kicking in mid-frame
+rcv($sock_a, $port_b, rtpm(0, $seq+3, 3000+160*3, $ssrc, "\x40\xe0\xb3\xad\xbd\x3f\x2c\x2f\x54\xbb\xb5\xc4\x6b\x5d\xde\xd9\x4e\x37\x35\x58\xb5\xab\xb4\x52\x2f\x2f\x47\xca\xbf\xd0\xfe\xd8\xc1\xc3\x57\x32\x2e\x40\xbc\xab\xb0\xe0\x39\x35\x46\xe3\xdb\x61\x5d\xcc\xb7\xb7\xe8\x33\x2b\x37\xcb\xae\xb0\xcb\x46\x3f\x50\x7e\x58\x41\x46\xcf\xb1\xae\xc6\x39\x2b\x31\x7d\xb7\xb5\xc8\x5d\x58\xe5\xe1\x4a\x37\x38\xf2\xb1\xab\xba\x44\x2e\x30\x4f\xc3\xbe\xd1\x7d\xd8\xc3\xc9\x4b\x30\x2f\x4c\xb6\xab\xb3\x61\x35\x35\x4b\xd8\xd6\x68\x68\xc8\xb7\xba\x5d\x30\x2c\x3c\xbf\xad\xb1\xd8\x40\x3e\x52\xfb\x58\x44\x4c\xc8\xb0\xb0\xd6\x34\x2b\x35\xd5\xb3\xb5\xcd\x54\x54\xec\xef\x47\x37\x3c\xd3\xaf\xac\xc0\x3c\x2d\x33\x63\xbe"));
+snd($sock_b, $port_a,  rtp(0, 1004, 3000+160*4, 0x3456, "\xbd\xd3\x77\xd9\xc5\xd0\x44\x30\x32\x65\xb2\xab\xb8\x4c\x32\x35\x50\xcf\xd2\x70\x7a\xc6\xb8\xbe\x4c\x2e\x2d\x45\xb9\xac\xb4\xfd\x3c\x3d\x55\xf2\x5a\x47\x56\xc1\xb0\xb4\x71\x30\x2b\x3a\xc7\xb0\xb6\xd7\x4d\x50\xf6\x78\x45\x38\x41\xc7\xae\xae\xcc\x37\x2c\x36\xe5\xbb\xbd\xd7\x6d\xdb\xc9\xdd\x3f\x30\x36\xdc\xae\xab\xbd\x41\x2f\x37\x5d\xcb\xcf\x7b\xef\xc4\xb9\xc6\x42\x2d\x2e\x55\xb4\xac\xb8\x58\x39\x3d\x59\xea\x5c\x4a\x66\xbd\xb0\xb8\x50\x2e\x2c\x40\xbd\xaf\xb8\xe8\x48\x4e\x7d\x6b\x43\x3a\x4a\xbf\xad\xaf\xe4\x32\x2c\x3a\xcf\xb8\xbd\xdc\x66\xde\xcc\xf5\x3c\x30\x3b\xca\xad\xac\xc6\x3b\x2e\x39\x7c\xc6\xcd\xfa\xe7\xc3\xbb\xce\x3c\x2d\x31\xf2"));
+# DTMF detected now
+rcv($sock_a, $port_b, rtpm(101 | 0x80, $seq+4, 3000+160*4, $ssrc, "\x08\x0f\x00\xa0"));
+snd($sock_b, $port_a,  rtp(0, 1005, 3000+160*5, 0x3456, "\x00" x 160));
+# reverting to audio, but DTMF event still progressing
+rcv($sock_a, $port_b, rtpm(101, $seq+5, 3000+160*4, $ssrc, "\x08\x0f\x01\x40"));
+snd($sock_b, $port_a,  rtp(0, 1006, 3000+160*6, 0x3456, "\x00" x 160));
+# end event, 3 times
+rcv($sock_a, $port_b, rtpm(101, $seq+6, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0"));
+rcv($sock_a, $port_b, rtpm(101, $seq+7, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0"));
+rcv($sock_a, $port_b, rtpm(101, $seq+8, 3000+160*4, $ssrc, "\x08\x8f\x01\xe0")); 
+# audio passing through again
+snd($sock_b, $port_a,  rtp(0, 1007, 3000+160*7, 0x3456, "\x00" x 160));
+rcv($sock_a, $port_b, rtpm(0, $seq+9, 3000+160*7, $ssrc, "\x00" x 160));
+
+
+
+
+
+($sock_a, $sock_b) = new_call([qw(198.51.100.1 7060)], [qw(198.51.100.3 7062)]);
+
+($port_a) = offer('DTMF scaling', { ICE => 'remove', replace => ['origin'],
+	codec => { transcode => ['PCMA', 'telephone-event/8000'] },
+	flags => ['always transcode'] }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.1
+s=tester
+t=0 0
+m=audio 7060 RTP/AVP 100 101
+c=IN IP4 198.51.100.1
+a=rtpmap:100 PCMU/16000
+a=rtpmap:101 telephone-event/16000
+a=fmtp:101 0-15
+a=sendrecv
+----------------------------------
+v=0
+o=- 1545997027 1 IN IP4 203.0.113.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 100 101 8 96
+c=IN IP4 203.0.113.1
+a=rtpmap:100 PCMU/16000
+a=rtpmap:101 telephone-event/16000
+a=rtpmap:8 PCMA/8000
+a=rtpmap:96 telephone-event/8000
+a=fmtp:101 0-15
+a=fmtp:96 0-15
+a=sendrecv
+a=rtcp:PORT
+SDP
+
+($port_b) = answer('DTMF scaling', { replace => ['origin'] }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.3
+s=tester
+t=0 0
+m=audio 7062 RTP/AVP 8 96
+c=IN IP4 198.51.100.3
+a=rtpmap:8 PCMA/8000
+a=rtpmap:96 telephone-event/8000
+a=fmtp:96 0-15
+a=sendrecv
+--------------------------------------
+v=0
+o=- 1545997027 1 IN IP4 203.0.113.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 100 101
+c=IN IP4 203.0.113.1
+a=rtpmap:100 PCMU/16000
+a=rtpmap:101 telephone-event/16000
+a=fmtp:101 0-15
+a=sendrecv
+a=rtcp:PORT
+SDP
+
+snd($sock_a, $port_b,  rtp(100, 1000, 3000+320*0, 0x1234, "\x00" x 320));
+# resample buffer is stalling
+Time::HiRes::usleep(20000); # 20 ms, needed to ensure that packet 1000 is received first
+snd($sock_a, $port_b,  rtp(100, 1001, 3000+320*1, 0x1234, "\x00" x 320));
+($ssrc) = rcv($sock_b, $port_a, rtpm(8, 1000, 3000+160*0, -1, "\x2a" x 160));
+snd($sock_a, $port_b,  rtp(100, 1002, 3000+320*2, 0x1234, "\x00" x 320));
+rcv($sock_b, $port_a, rtpm(8, 1001, 3000+160*1, $ssrc, "\x2a" x 160));
+# start dtmf
+snd($sock_a, $port_b,  rtp(101 | 0x80, 1003, 3000+320*3, 0x1234, "\x08\x0f\x01\x40"));
+rcv($sock_b, $port_a, rtpm(96 | 0x80, 1002, 3000+160*2, $ssrc, "\x08\x0f\x00\xa0"));
+snd($sock_a, $port_b,  rtp(101, 1004, 3000+320*3, 0x1234, "\x08\x0f\x02\x80"));
+rcv($sock_b, $port_a, rtpm(96, 1003, 3000+160*2, $ssrc, "\x08\x0f\x01\x40"));
+# end event
+snd($sock_a, $port_b,  rtp(101, 1005, 3000+320*3, 0x1234, "\x08\x8f\x03\xc0"));
+rcv($sock_b, $port_a, rtpm(96, 1004, 3000+160*2, $ssrc, "\x08\x8f\x01\xe0"));
+snd($sock_a, $port_b,  rtp(101, 1006, 3000+320*3, 0x1234, "\x08\x8f\x03\xc0"));
+rcv($sock_b, $port_a, rtpm(96, 1005, 3000+160*2, $ssrc, "\x08\x8f\x01\xe0"));
+snd($sock_a, $port_b,  rtp(101, 1007, 3000+320*3, 0x1234, "\x08\x8f\x03\xc0"));
+rcv($sock_b, $port_a, rtpm(96, 1006, 3000+160*2, $ssrc, "\x08\x8f\x01\xe0"));
+# back to audio
+snd($sock_a, $port_b,  rtp(100, 1008, 3000+320*6, 0x1234, "\x00" x 320));
+rcv($sock_b, $port_a, rtpm(8, 1007, 3000+160*5, $ssrc, "\x2a" x 160));
+
+
+
+
 
 
 END {
diff --git a/t/test-dtmf-detect.c b/t/test-dtmf-detect.c
new file mode 100644
index 000000000..788b99299
--- /dev/null
+++ b/t/test-dtmf-detect.c
@@ -0,0 +1,649 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <endian.h>
+#include <spandsp/telephony.h>
+#include <spandsp/super_tone_rx.h>
+#include <spandsp/logging.h>
+#include <spandsp/dtmf.h>
+#include <glib.h>
+
+static unsigned char samples[] = {
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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+  0xa9, 0x36, 0x64, 0x33, 0x2f, 0x10, 0x45, 0xf2, 0x2d, 0xf0, 0x87, 0xfe,
+  0x29, 0x01, 0x5f, 0xed, 0x25, 0xd8, 0x91, 0xe0, 0x75, 0x0c, 0x52, 0x3c,
+  0x9b, 0x45, 0xf4, 0x1a, 0x79, 0xdb, 0x67, 0xb8, 0x22, 0xca, 0x2b, 0xfc,
+  0x15, 0x23, 0xf8, 0x24, 0xf5, 0x0d, 0xd1, 0xfd, 0x7e, 0x04, 0x14, 0x12,
+  0xd2, 0x0a, 0x18, 0xe9, 0x7b, 0xc8, 0xfc, 0xcc, 0x4c, 0xfd, 0x60, 0x37,
+  0x54, 0x4c, 0x8d, 0x2a, 0xf2, 0xed, 0x7e, 0xc6, 0xa0, 0xcd, 0xd4, 0xf2,
+  0x42, 0x10, 0xe3, 0x10, 0x08, 0x02, 0xdf, 0xff, 0x82, 0x13, 0xd6, 0x26,
+  0xb8, 0x1b, 0xe9, 0xee, 0x88, 0xc1, 0xdf, 0xbc, 0xdf, 0xea, 0xda, 0x29,
+  0xd1, 0x48, 0xc2, 0x32, 0x0d, 0xff, 0xca, 0xd9, 0xab, 0xda, 0x35, 0xf3,
+  0x2d, 0x03, 0x1a, 0xfc, 0x4e, 0xef, 0xe4, 0xf7, 0x9e, 0x19, 0x99, 0x37,
+  0x43, 0x2f, 0xfb, 0xfc, 0xc8, 0xc4, 0x98, 0xb4, 0x75, 0xda, 0x97, 0x17,
+  0x01, 0x3c, 0xff, 0x30, 0xf4, 0x09, 0x3d, 0xed, 0x1f, 0xee, 0x87, 0xfd,
+  0x39, 0xff, 0xd1, 0xeb, 0x6d, 0xda, 0x1a, 0xe8, 0x86, 0x15, 0x31, 0x40,
+  0x3b, 0x40, 0x26, 0x0f, 0x23, 0xd1, 0x63, 0xb6, 0xc3, 0xd0, 0xca, 0x05,
+  0x28, 0x29, 0x72, 0x25, 0x6b, 0x0b, 0xc1, 0xfb, 0x31, 0x03, 0x4c, 0x0f,
+  0x6d, 0x05, 0xf5, 0xe3, 0xb2, 0xc8, 0xbe, 0xd4, 0xb2, 0x08, 0x9f, 0x3e,
+  0x06, 0x4a, 0x40, 0x20, 0xfe, 0xe2, 0xdf, 0xc1, 0xba, 0xd0, 0x73, 0xf9,
+  0x3e, 0x15, 0xc1, 0x12, 0xd4, 0x02, 0x85, 0x01, 0xa9, 0x14, 0x16, 0x24,
+  0x04, 0x14, 0x45, 0xe6, 0x85, 0xbe, 0x13, 0xc3, 0xe7, 0xf6, 0x98, 0x33,
+  0xed, 0x49, 0x5e, 0x2b, 0x56, 0xf5, 0x15, 0xd4, 0xc0, 0xda, 0x19, 0xf6,
+  0x7a, 0x05, 0x84, 0xfd, 0x2f, 0xf2, 0x21, 0xfd, 0x3c, 0x1e, 0xa3, 0x36,
+  0x07, 0x27, 0xbf, 0xf1, 0x5f, 0xbe, 0xe0, 0xb7, 0x42, 0xe5, 0x4a, 0x22,
+  0xe1, 0x3f, 0x2b, 0x2d, 0x06, 0x03, 0x4d, 0xe8, 0x81, 0xec, 0xf2, 0xfc,
+
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+
+static void report_func(void *ptr, int code, int level, int delay) {
+	GString *output = ptr;
+	printf("code %i level %i delay %i\n", code, level, delay);
+	g_string_append_printf(output, "code %i level %i delay %i, ", code, level, delay);
+}
+
+int main(int argc, char **argv) {
+	if (htole16(0x1234) != 0x1234) {
+		printf("Wrong native byte order - skipping test\n");
+		return 0;
+	}
+
+	GString *output = g_string_new("");
+
+	dtmf_rx_state_t *dtmf_dsp;
+	dtmf_dsp = dtmf_rx_init(NULL, NULL, NULL);
+	dtmf_rx_set_realtime_callback(dtmf_dsp, report_func, output);
+
+	unsigned char *reader = samples;
+	unsigned char *end = samples + sizeof(samples);
+	int packetise = 160;
+
+	int iter = 0;
+	while (1) {
+		unsigned char *packet_end = reader + packetise * 2;
+		if (packet_end > end)
+			break;
+		int ret = dtmf_rx(dtmf_dsp, (void *) reader, packetise);
+		printf("ret %i\n", ret);
+		if (ret != 0)
+			abort();
+		int digit = dtmf_rx_status(dtmf_dsp);
+		printf("status %i %c\n", digit, digit);
+
+		reader += packetise * 2;
+		iter++;
+	}
+
+	printf("result: %s\n", output->str);
+	if (strcmp(output->str, "code 56 level -4 delay 1020, "
+				"code 0 level -99 delay 918, "
+				"code 56 level -4 delay 510, "
+				"code 0 level -99 delay 816, "))
+		abort();
+
+	return 0;
+}