diff --git a/openbsc/include/openbsc/gsm_04_11.h b/openbsc/include/openbsc/gsm_04_11.h
index 149de90..017c887 100644
--- a/openbsc/include/openbsc/gsm_04_11.h
+++ b/openbsc/include/openbsc/gsm_04_11.h
@@ -39,4 +39,9 @@
 void gsm411_sapi_n_reject(struct gsm_subscriber_connection *conn);
 
 uint8_t sms_next_rp_msg_ref(uint8_t *next_rp_ref);
+
+int gsm411_send_rp_ack(struct gsm_trans *trans, uint8_t msg_ref);
+int gsm411_send_rp_error(struct gsm_trans *trans, uint8_t msg_ref,
+			 uint8_t cause);
+
 #endif
diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index 1d90eee..6d814c8 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -429,6 +429,11 @@
 	enum gsm_sms_source_id source;
 
 	struct {
+		uint8_t transaction_id;
+		uint32_t msg_ref;
+	} gsm411;
+
+	struct {
 		struct osmo_esme *esme;
 		uint32_t sequence_nr;
 		int transaction_mode;