diff --git a/daemon/call_interfaces.c b/daemon/call_interfaces.c
index 20440f5d8..b46f87200 100644
--- a/daemon/call_interfaces.c
+++ b/daemon/call_interfaces.c
@@ -1852,6 +1852,22 @@ static void call_ng_main_flags(sdp_ng_flags *out, str *key, bencode_item_t *valu
 		case CSH_LOOKUP("set-label"):
 			out->set_label = s;
 			break;
+		case CSH_LOOKUP("sip-message-type"):
+		case CSH_LOOKUP("sip_message_type"):
+			switch (__csh_lookup(&s)) {
+				case CSH_LOOKUP("sip-request"):
+				case CSH_LOOKUP("sip_request"):
+					out->message_type = SIP_REQUEST;
+					break;
+				case CSH_LOOKUP("sip-reply"):
+				case CSH_LOOKUP("sip_reply"):
+					out->message_type = SIP_REPLY;
+					break;
+				default:
+					ilog(LOG_WARN, "Unknown 'sip-message-type' flag encountered: '" STR_FORMAT "'",
+							STR_FMT(&s));
+			}
+			break;
 		case CSH_LOOKUP("start-pos"):
 			out->start_pos = bencode_get_integer_str(value, out->start_pos);
 			break;
diff --git a/include/call.h b/include/call.h
index 6d9faa0b3..ea5e459cc 100644
--- a/include/call.h
+++ b/include/call.h
@@ -52,6 +52,13 @@ enum stream_address_format {
 	SAF_NG,
 	SAF_ICE,
 };
+
+enum message_type {
+	SIP_OTHER = 0,
+	SIP_REQUEST,
+	SIP_REPLY,
+};
+
 enum call_opmode {
 	OP_OFFER = 0,
 	OP_ANSWER = 1,
diff --git a/include/call_interfaces.h b/include/call_interfaces.h
index 7042ef8e6..a343bab67 100644
--- a/include/call_interfaces.h
+++ b/include/call_interfaces.h
@@ -16,6 +16,7 @@ struct sockaddr_in6;
 
 struct sdp_ng_flags {
 	enum call_opmode opmode;
+	enum message_type message_type;
 	str call_id;
 	str from_tag;
 	str_q from_tags;