diff --git a/daemon/call.c b/daemon/call.c
index 63ba93bcb..e5becbbc9 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -2411,6 +2411,7 @@ static void __call_free(void *p) {
 		g_queue_clear_full(&md->codecs_prefs_recv, (GDestroyNotify) payload_type_free);
 		g_queue_clear_full(&md->codecs_prefs_send, (GDestroyNotify) payload_type_free);
 		codec_handlers_free(md);
+		g_queue_clear_full(&md->sdp_attributes, free);
 		g_slice_free1(sizeof(*md), md);
 	}
 
diff --git a/daemon/sdp.c b/daemon/sdp.c
index 23eef3385..d8729e03d 100644
--- a/daemon/sdp.c
+++ b/daemon/sdp.c
@@ -1513,6 +1513,14 @@ static void insert_codec_parameters(struct sdp_chopper *chop, struct call_media
 	}
 }
 
+static void insert_sdp_attributes(struct sdp_chopper *chop, struct call_media *cm) {
+	for (GList *l = cm->sdp_attributes.head; l; l = l->next) {
+		str *s = l->data;
+		chopper_append_printf(chop, "a=" STR_FORMAT "\r\n",
+				STR_FMT(s));
+	}
+}
+
 static int replace_media_port(struct sdp_chopper *chop, struct sdp_media *media, struct packet_stream *ps) {
 	str *port = &media->port;
 	unsigned int p;
@@ -2118,7 +2126,10 @@ int sdp_replace(struct sdp_chopper *chop, GQueue *sessions, struct call_monologu
 				chopper_append_c(chop, "\r\n");
 			}
 
-			insert_codec_parameters(chop, call_media);
+			if (call_media->protocol && call_media->protocol->rtp)
+				insert_codec_parameters(chop, call_media);
+
+			insert_sdp_attributes(chop, call_media);
 
 			ps_rtcp = NULL;
 			if (ps->rtcp_sibling) {
diff --git a/include/call.h b/include/call.h
index d6a3d6798..da33d994c 100644
--- a/include/call.h
+++ b/include/call.h
@@ -322,6 +322,8 @@ struct call_media {
 	GHashTable		*codec_names_send; // codec name -> GQueue of int payload types; storage container
 	GQueue			codecs_prefs_send; // storage container
 
+	GQueue			sdp_attributes; // str_sprintf()
+
 	GHashTable		*codec_handlers; // int payload type -> struct codec_handler
 						// XXX combine this with 'codecs_recv' hash table?
 	GQueue			codec_handlers_store; // storage for struct codec_handler