diff --git a/daemon/call.c b/daemon/call.c
index 3dd2ae758..2dfdb342d 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -2430,10 +2430,9 @@ int monologue_offer_answer(struct call_monologue *dialogue[2], GQueue *streams,
 					SHARED_FLAG_ICE | SHARED_FLAG_TRICKLE_ICE | SHARED_FLAG_ICE_LITE_PEER |
 					SHARED_FLAG_RTCP_FB);
 
-			// steal the entire queue of offered crypto params
+			// duplicate the entire queue of offered crypto params
 			crypto_params_sdes_queue_clear(&other_media->sdes_in);
-			other_media->sdes_in = sp->sdes_params;
-			g_queue_init(&sp->sdes_params);
+			crypto_params_sdes_queue_copy(&other_media->sdes_in, &sp->sdes_params);
 
 			if (other_media->sdes_in.length) {
 				MEDIA_SET(other_media, SDES);
@@ -3025,9 +3024,12 @@ static void __call_free(void *p) {
 		g_hash_table_destroy(m->other_tags);
 		g_hash_table_destroy(m->branches);
 		g_hash_table_destroy(m->media_ids);
-		if (m->last_sdp)
-			g_string_free(m->last_sdp, TRUE);
 		free_ssrc_hash(&m->ssrc_hash);
+		if (m->last_out_sdp)
+			g_string_free(m->last_out_sdp, TRUE);
+		str_free_dup(&m->last_in_sdp);
+		sdp_free(&m->last_in_sdp_parsed);
+		sdp_streams_free(&m->last_in_sdp_streams);
 		g_slice_free1(sizeof(*m), m);
 	}
 
diff --git a/daemon/call_interfaces.c b/daemon/call_interfaces.c
index 78eb14dcf..7122eadfe 100644
--- a/daemon/call_interfaces.c
+++ b/daemon/call_interfaces.c
@@ -1320,11 +1320,28 @@ static void fragments_cleanup(int all) {
 	mutex_unlock(&sdp_fragments_lock);
 }
 
+
+static void save_last_sdp(struct call_monologue *ml, str *sdp, GQueue *parsed, GQueue *streams) {
+	str_free_dup(&ml->last_in_sdp);
+	ml->last_in_sdp = *sdp;
+	*sdp = STR_NULL;
+
+	sdp_free(&ml->last_in_sdp_parsed);
+	ml->last_in_sdp_parsed = *parsed;
+	g_queue_init(parsed);
+
+	sdp_streams_free(&ml->last_in_sdp_streams);
+	ml->last_in_sdp_streams = *streams;
+	g_queue_init(streams);
+}
+
+
 static const char *call_offer_answer_ng(struct ng_buffer *ngbuf, bencode_item_t *input,
 		bencode_item_t *output, enum call_opmode opmode, const char* addr,
 		const endpoint_t *sin)
 {
 	const char *errstr;
+	AUTO_CLEANUP(str sdp, str_free_dup) = STR_NULL;
 	AUTO_CLEANUP(GQueue parsed, sdp_free) = G_QUEUE_INIT;
 	AUTO_CLEANUP(GQueue streams, sdp_streams_free) = G_QUEUE_INIT;
 	struct call *call;
@@ -1347,13 +1364,15 @@ static const char *call_offer_answer_ng(struct ng_buffer *ngbuf, bencode_item_t
 		str_swap(&flags.to_tag, &flags.from_tag);
 	}
 
+	str_init_dup_str(&sdp, &flags.sdp);
+
 	errstr = "Failed to parse SDP";
-	if (sdp_parse(&flags.sdp, &parsed, &flags))
+	if (sdp_parse(&sdp, &parsed, &flags))
 		goto out;
 
 	if (flags.loop_protect && sdp_is_duplicate(&parsed)) {
 		ilog(LOG_INFO, "Ignoring message as SDP has already been processed by us");
-		bencode_dictionary_add_str(output, "sdp", &flags.sdp);
+		bencode_dictionary_add_str(output, "sdp", &sdp);
 		errstr = NULL;
 		goto out;
 	}
@@ -1420,7 +1439,7 @@ static const char *call_offer_answer_ng(struct ng_buffer *ngbuf, bencode_item_t
 		dialogue[0]->tagtype = TO_TAG;
 	}
 
-	chopper = sdp_chopper_new(&flags.sdp);
+	chopper = sdp_chopper_new(&sdp);
 	bencode_buffer_destroy_add(output->buffer, (free_func_t) sdp_chopper_destroy, chopper);
 
 	detect_setup_recording(call, &flags.record_call_str, &flags.metadata);
@@ -1451,11 +1470,12 @@ static const char *call_offer_answer_ng(struct ng_buffer *ngbuf, bencode_item_t
 		do_dequeue = 0;
 	}
 
-	// streams and flags are invalid after here
+	if (!ret)
+		save_last_sdp(dialogue[0], &sdp, &parsed, &streams);
 
 	struct recording *recording = call->recording;
 	if (recording != NULL) {
-		meta_write_sdp_before(recording, &flags.sdp, dialogue[0], opmode);
+		meta_write_sdp_before(recording, &sdp, dialogue[0], opmode);
 		meta_write_sdp_after(recording, chopper->output,
 			       dialogue[0], opmode);
 
diff --git a/daemon/sdp.c b/daemon/sdp.c
index 73ba0e242..b91a45b51 100644
--- a/daemon/sdp.c
+++ b/daemon/sdp.c
@@ -2446,17 +2446,17 @@ static void sdp_version_check(struct sdp_chopper *chop, GQueue *sessions, struct
 	// first update all versions to match our single version
 	sdp_version_replace(chop, sessions, monologue);
 	// then check if we need to change
-	if (!monologue->last_sdp)
+	if (!monologue->last_out_sdp)
 		goto dup;
-	if (g_string_equal(monologue->last_sdp, chop->output))
+	if (g_string_equal(monologue->last_out_sdp, chop->output))
 		return;
 
 	// mismatch detected. increment version, update again, and store copy
 	monologue->sdp_version++;
 	sdp_version_replace(chop, sessions, monologue);
-	g_string_free(monologue->last_sdp, TRUE);
+	g_string_free(monologue->last_out_sdp, TRUE);
 dup:
-	monologue->last_sdp = g_string_new_len(chop->output->str, chop->output->len);
+	monologue->last_out_sdp = g_string_new_len(chop->output->str, chop->output->len);
 }
 
 
diff --git a/include/call.h b/include/call.h
index 9f6866312..f26368fb2 100644
--- a/include/call.h
+++ b/include/call.h
@@ -403,7 +403,10 @@ struct call_monologue {
 	GHashTable		*media_ids;
 	struct media_player	*player;
 	unsigned long long	sdp_version;
-	GString			*last_sdp;
+	str			last_in_sdp;
+	GQueue			last_in_sdp_parsed;
+	GQueue			last_in_sdp_streams;
+	GString			*last_out_sdp;
 	char			*sdp_username;
 	char			*sdp_session_name;
 	struct ssrc_hash	*ssrc_hash;
diff --git a/include/crypto.h b/include/crypto.h
index 5a60e6631..44cc3f46b 100644
--- a/include/crypto.h
+++ b/include/crypto.h
@@ -207,6 +207,15 @@ INLINE void crypto_params_sdes_free(struct crypto_params_sdes *cps) {
 INLINE void crypto_params_sdes_queue_clear(GQueue *q) {
 	g_queue_clear_full(q, (GDestroyNotify) crypto_params_sdes_free);
 }
+INLINE void crypto_params_sdes_queue_copy(GQueue *dst, const GQueue *src) {
+	for (const GList *l = src->head; l; l = l->next) {
+		struct crypto_params_sdes *cps = l->data;
+		struct crypto_params_sdes *cpy = g_slice_alloc(sizeof(*cpy));
+		*cpy = *cps;
+		crypto_params_copy(&cpy->params, &cps->params, 1);
+		g_queue_push_tail(dst, cpy);
+	}
+}
 
 
 #include "main.h"