diff --git a/daemon/call.c b/daemon/call.c
index 2dfdb342d..d438b65ae 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -2076,6 +2076,8 @@ static void __update_media_protocol(struct call_media *media, struct call_media
 	}
 
 	/* deduct protocol from stream parameters received */
+	call_str_cpy(other_media->call, &other_media->protocol_str, &sp->protocol_str);
+
 	if (other_media->protocol != sp->protocol) {
 		other_media->protocol = sp->protocol;
 		/* If the endpoint changes the protocol, we reset the other side's
diff --git a/daemon/sdp.c b/daemon/sdp.c
index d7eeaeedb..51bc6ede3 100644
--- a/daemon/sdp.c
+++ b/daemon/sdp.c
@@ -1530,6 +1530,7 @@ int sdp_streams(const GQueue *sessions, GQueue *streams, struct sdp_ng_flags *fl
 
 			sp->consecutive_ports = media->port_count;
 			sp->num_ports = sp->consecutive_ports * 2; // only do *=2 for RTP streams?
+			sp->protocol_str = media->transport;
 			sp->protocol = transport_protocol(&media->transport);
 			sp->type = media->media_type_str;
 			sp->type_id = media->media_type_id;
diff --git a/include/call.h b/include/call.h
index f26368fb2..536be8e0b 100644
--- a/include/call.h
+++ b/include/call.h
@@ -244,6 +244,7 @@ struct stream_params {
 	struct endpoint		rtcp_endpoint;
 	unsigned int		consecutive_ports;
 	unsigned int		num_ports;
+	str			protocol_str;
 	const struct transport_protocol *protocol;
 	str			format_str;
 	GQueue			sdes_params; // slice-alloc'd
@@ -333,6 +334,7 @@ struct call_media {
 	unsigned int		unique_id;	/* RO */
 	str			type;
 	enum media_type		type_id;
+	str			protocol_str;
 	const struct transport_protocol *protocol;
 	str			format_str;
 	sockfamily_t		*desired_family;