diff --git a/daemon/call.c b/daemon/call.c
index 917186774..2df0fd510 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -2620,7 +2620,7 @@ static void __media_init_from_flags(struct call_media *other_media, struct call_
 		struct stream_params *sp, sdp_ng_flags *flags)
 {
 	call_t *call = other_media->call;
-	str_q *additional_attributes = &sp->attributes; /* attributes in str format */
+	__auto_type additional_attributes = &sp->attributes; /* attributes in str format */
 
 	if (flags->opmode == OP_OFFER && flags->reset) {
 		if (media)
@@ -2706,7 +2706,7 @@ static void __media_init_from_flags(struct call_media *other_media, struct call_
 	 * other (unknown type)
 	 */
 	if (media) {
-		t_queue_clear_full(&media->sdp_attributes, str_free);
+		t_queue_clear_full(&media->sdp_attributes, sdp_attr_free);
 		media->sdp_attributes = *additional_attributes;
 		t_queue_init(additional_attributes);
 	}
@@ -3838,7 +3838,7 @@ void call_media_free(struct call_media **mdp) {
 	codec_handlers_free(md);
 	codec_handler_free(&md->t38_handler);
 	t38_gateway_put(&md->t38_gateway);
-	t_queue_clear_full(&md->sdp_attributes, str_free);
+	t_queue_clear_full(&md->sdp_attributes, sdp_attr_free);
 	t_queue_clear_full(&md->dtmf_recv, dtmf_event_free);
 	t_queue_clear_full(&md->dtmf_send, dtmf_event_free);
 	t_hash_table_destroy(md->media_subscribers_ht);
@@ -3859,7 +3859,7 @@ void __monologue_free(struct call_monologue *m) {
 		g_string_free(m->last_out_sdp, TRUE);
 	str_free_dup(&m->last_in_sdp);
 	sdp_sessions_clear(&m->last_in_sdp_parsed);
-	t_queue_clear_full(&m->sdp_attributes, str_free);
+	t_queue_clear_full(&m->sdp_attributes, sdp_attr_free);
 	sdp_streams_clear(&m->last_in_sdp_streams);
 	g_slice_free1(sizeof(*m), m);
 }
diff --git a/daemon/sdp.c b/daemon/sdp.c
index 2d43a197b..de0c89fe6 100644
--- a/daemon/sdp.c
+++ b/daemon/sdp.c
@@ -1678,7 +1678,7 @@ static void sp_free(struct stream_params *s) {
 	codec_store_cleanup(&s->codecs);
 	ice_candidates_free(&s->ice_candidates);
 	crypto_params_sdes_queue_clear(&s->sdes_params);
-	t_queue_clear_full(&s->attributes, str_free);
+	t_queue_clear_full(&s->attributes, sdp_attr_free);
 	g_slice_free1(sizeof(*s), s);
 }
 
@@ -1763,6 +1763,20 @@ static bool legacy_osrtp_accept(struct stream_params *sp, sdp_streams_q *streams
 	return false;
 }
 
+static struct sdp_attr *sdp_attr_dup(const struct sdp_attribute *c) {
+	struct sdp_attr *ac = g_new0(__typeof(*ac), 1);
+
+	str_init_dup_str(&ac->strs.name, &c->strs.name);
+	str_init_dup_str(&ac->strs.value, &c->strs.value);
+
+	return ac;
+}
+
+void sdp_attr_free(struct sdp_attr *c) {
+	str_free_dup(&c->strs.name);
+	str_free_dup(&c->strs.value);
+	g_free(c);
+}
 /* XXX split this function up */
 int sdp_streams(const sdp_sessions_q *sessions, sdp_streams_q *streams, sdp_ng_flags *flags) {
 	struct sdp_session *session;
@@ -1852,8 +1866,8 @@ int sdp_streams(const sdp_sessions_q *sessions, sdp_streams_q *streams, sdp_ng_f
 					attrs = attr_list_get_by_id(&media->attributes, ATTR_EXTMAP);
 					for (__auto_type ll = attrs ? attrs->head : NULL; ll; ll = ll->next) {
 						attr = ll->data;
-						str * ret = str_dup(&attr->strs.line_value);
-						t_queue_push_tail(&sp->attributes, ret);
+						struct sdp_attr *ac = sdp_attr_dup(attr);
+						t_queue_push_tail(&sp->attributes, ac);
 					}
 				}
 
@@ -1861,8 +1875,8 @@ int sdp_streams(const sdp_sessions_q *sessions, sdp_streams_q *streams, sdp_ng_f
 				attrs = attr_list_get_by_id(&media->attributes, ATTR_OTHER);
 				for (__auto_type ll = attrs ? attrs->head : NULL; ll; ll = ll->next) {
 					attr = ll->data;
-					str * ret = str_dup(&attr->strs.line_value);
-					t_queue_push_tail(&sp->attributes, ret);
+					struct sdp_attr *ac = sdp_attr_dup(attr);
+					t_queue_push_tail(&sp->attributes, ac);
 				}
 			}
 
@@ -2147,13 +2161,13 @@ static void insert_codec_parameters(GString *s, struct call_media *cm,
 void sdp_insert_media_attributes(GString *gs, union sdp_attr_print_arg a, const sdp_ng_flags *flags) {
 	for (__auto_type l = a.cm->sdp_attributes.head; l; l = l->next) {
 		__auto_type s = l->data;
-		append_attr_to_gstring(gs, s->s, NULL, flags, a.cm->type_id);
+		append_str_attr_to_gstring(gs, &s->strs.name, &s->strs.value, flags, a.cm->type_id);
 	}
 }
 void sdp_insert_monologue_attributes(GString *gs, union sdp_attr_print_arg a, const sdp_ng_flags *flags) {
 	for (__auto_type l = a.ml->sdp_attributes.head; l; l = l->next) {
 		__auto_type s = l->data;
-		append_attr_to_gstring(gs, s->s, NULL, flags, MT_UNKNOWN);
+		append_str_attr_to_gstring(gs, &s->strs.name, &s->strs.value, flags, MT_UNKNOWN);
 	}
 }
 
@@ -3020,14 +3034,13 @@ struct packet_stream *print_rtcp(GString *s, struct call_media *media, packet_st
 
 /* copy sdp session attributes to the correlated monologue, as a plain text objects (str) */
 void sdp_copy_session_attributes(struct call_monologue * src, struct call_monologue * dst) {
-	struct sdp_attribute *attr;
 	struct sdp_session *src_session = src->last_in_sdp_parsed.head->data;
 	attributes_q *src_attributes = attr_list_get_by_id(&src_session->attributes, ATTR_OTHER);
-	t_queue_clear_full(&dst->sdp_attributes, str_free);
+	t_queue_clear_full(&dst->sdp_attributes, sdp_attr_free);
 	for (__auto_type ll = src_attributes ? src_attributes->head : NULL; ll; ll = ll->next) {
-		attr = ll->data;
-		str * ret = str_dup(&attr->strs.line_value);
-		t_queue_push_tail(&dst->sdp_attributes, ret);
+		struct sdp_attribute *attr = ll->data;
+		struct sdp_attr *ac = sdp_attr_dup(attr);
+		t_queue_push_tail(&dst->sdp_attributes, ac);
 	}
 }
 static void print_sdp_session_section(GString *s, sdp_ng_flags *flags,
diff --git a/daemon/t38.c b/daemon/t38.c
index e2460822b..5403240c9 100644
--- a/daemon/t38.c
+++ b/daemon/t38.c
@@ -11,6 +11,7 @@
 #include "str.h"
 #include "media_player.h"
 #include "log_funcs.h"
+#include "sdp.h"
 
 
 
diff --git a/include/call.h b/include/call.h
index f5066f70b..12c0a57b9 100644
--- a/include/call.h
+++ b/include/call.h
@@ -331,7 +331,7 @@ struct stream_params {
 	const struct transport_protocol *protocol;
 	str			format_str;
 	sdes_q			sdes_params; // slice-alloc'd
-	str_q			attributes;	/* just some other attributes */
+	sdp_attr_q		attributes;	/* just some other attributes */
 	str			direction[2];
 	sockfamily_t		*desired_family;
 	struct dtls_fingerprint fingerprint;
@@ -469,7 +469,7 @@ struct call_media {
 	endpoint_map_q		endpoint_maps;
 
 	struct codec_store	codecs;
-	str_q			sdp_attributes;			/* str_sprintf() */
+	sdp_attr_q		sdp_attributes;			/* sdp_attr_new() */
 	sdp_attr_print_f	*sdp_attr_print;
 	codec_handlers_ht	codec_handlers;			/* int payload type -> struct codec_handler
 														XXX combine this with 'codecs' hash table? */
@@ -575,7 +575,7 @@ struct call_monologue {
 	unsigned int		dtmf_delay;
 
 	/* carry `sdp_session` attributes into resulting call monologue SDP */
-	str_q			sdp_attributes;
+	sdp_attr_q		sdp_attributes;
 	sdp_attr_print_f	*sdp_attr_print;
 
 	atomic64		ml_flags;
diff --git a/include/sdp.h b/include/sdp.h
index 0703fbfba..e016d7585 100644
--- a/include/sdp.h
+++ b/include/sdp.h
@@ -34,6 +34,10 @@ struct sdp_attribute_strs {
 	str key;	/* "rtpmap:8" */
 };
 
+struct sdp_attr {
+	struct sdp_attribute_strs strs;
+};
+
 
 extern const str rtpe_instance_id;
 
@@ -47,6 +51,8 @@ void sdp_append_str_attr(GString *s, const sdp_ng_flags *flags, enum media_type
 	__attribute__ ((format (printf, 5, 6)));
 #define sdp_append_attr(s, g, t, n, f, ...) sdp_append_str_attr(s, g, t, &STR_INIT(n), f, ##__VA_ARGS__)
 
+void sdp_attr_free(struct sdp_attr *);
+
 int sdp_parse(str *body, sdp_sessions_q *sessions, const sdp_ng_flags *);
 int sdp_streams(const sdp_sessions_q *sessions, sdp_streams_q *streams, sdp_ng_flags *);
 void sdp_streams_clear(sdp_streams_q *);
diff --git a/include/types.h b/include/types.h
index 2b9f5d880..d3f46bdfa 100644
--- a/include/types.h
+++ b/include/types.h
@@ -52,4 +52,7 @@ TYPED_GHASHTABLE_PROTO(codec_stats_ht, char, struct codec_stats)
 
 TYPED_GQUEUE(call, call_t)
 
+struct sdp_attr;
+TYPED_GQUEUE(sdp_attr, struct sdp_attr)
+
 #endif