diff --git a/daemon/call.c b/daemon/call.c
index e4227b1df..63ba93bcb 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -1848,7 +1848,7 @@ static void __update_media_protocol(struct call_media *media, struct call_media
 	/* allow override of outgoing protocol even if we know it already */
 	/* but only if this is an RTP-based protocol */
 	if (flags->transport_protocol
-			&& other_media->protocol && other_media->protocol->rtp) {
+			&& proto_is_rtp(other_media->protocol)) {
 		media->protocol = flags->transport_protocol;
 		return;
 	}
@@ -2232,7 +2232,7 @@ void call_destroy(struct call *c) {
 				STR_FMT(&md->type),			\
 				md->protocol ? md->protocol->name : "(unknown)"
 
-			if (md->protocol && md->protocol->rtp) {
+			if (proto_is_rtp(md->protocol)) {
 				rtp_pt = __rtp_stats_codec(md);
 				if (!rtp_pt)
 					ilog(LOG_INFO, MLL_PREFIX "unknown codec", MLL_COMMON);
diff --git a/daemon/media_socket.c b/daemon/media_socket.c
index d29b2b7df..e6ca24c88 100644
--- a/daemon/media_socket.c
+++ b/daemon/media_socket.c
@@ -1119,7 +1119,7 @@ void kernelize(struct packet_stream *stream) {
 
 	ZERO(stream->kernel_stats);
 
-	if (stream->media->protocol && stream->media->protocol->rtp) {
+	if (proto_is_rtp(stream->media->protocol)) {
 		GList *values, *l;
 		struct rtp_stats *rs;
 
@@ -1416,9 +1416,7 @@ static void media_packet_rtp(struct packet_handler_ctx *phc)
 {
 	phc->payload_type = -1;
 
-	if (G_UNLIKELY(!phc->mp.media->protocol))
-		return;
-	if (G_UNLIKELY(!phc->mp.media->protocol->rtp))
+	if (G_UNLIKELY(!proto_is_rtp(phc->mp.media->protocol)))
 		return;
 
 	if (G_LIKELY(!phc->rtcp && !rtp_payload(&phc->mp.rtp, &phc->mp.payload, &phc->s))) {
diff --git a/daemon/sdp.c b/daemon/sdp.c
index 931fe4877..23eef3385 100644
--- a/daemon/sdp.c
+++ b/daemon/sdp.c
@@ -1114,7 +1114,7 @@ static int __rtp_payload_types(struct stream_params *sp, struct sdp_media *media
 	struct sdp_attribute *attr;
 	int ret = 0;
 
-	if (!sp->protocol || !sp->protocol->rtp)
+	if (!proto_is_rtp(sp->protocol))
 		return 0;
 
 	/* first go through a=rtpmap and build a hash table of attrs */
@@ -1479,7 +1479,7 @@ static int replace_format_str(struct sdp_chopper *chop,
 static int replace_codec_list(struct sdp_chopper *chop,
 		struct sdp_media *media, struct call_media *cm)
 {
-	if (cm->protocol && !cm->protocol->rtp)
+	if (proto_is_not_rtp(cm->protocol))
 		return replace_format_str(chop, media, cm);
 
 	if (cm->codecs_prefs_recv.length == 0)
@@ -2140,7 +2140,7 @@ int sdp_replace(struct sdp_chopper *chop, GQueue *sessions, struct call_monologu
 					chopper_append_c(chop, "a=inactive\r\n");
 			}
 
-			if (call_media->protocol && call_media->protocol->rtp) {
+			if (proto_is_rtp(call_media->protocol)) {
 				if (MEDIA_ISSET(call_media, RTCP_MUX)
 						&& (flags->opmode == OP_ANSWER
 							|| (flags->opmode == OP_OFFER
diff --git a/include/media_socket.h b/include/media_socket.h
index 6e42aee14..5ab3e8827 100644
--- a/include/media_socket.h
+++ b/include/media_socket.h
@@ -190,5 +190,18 @@ INLINE struct local_intf *get_interface_from_address(const struct logical_intf *
 }
 */
 
+INLINE int proto_is_rtp(const struct transport_protocol *protocol) {
+	// known to be RTP? therefore unknown is not RTP
+	if (!protocol)
+		return 0;
+	return protocol->rtp ? 1 : 0;
+}
+INLINE int proto_is_not_rtp(const struct transport_protocol *protocol) {
+	// known not to be RTP? therefore unknown might be RTP
+	if (!protocol)
+		return 0;
+	return protocol->rtp ? 0 : 1;
+}
+
 
 #endif