diff --git a/include/osmocom/msc/silent_call.h b/include/osmocom/msc/silent_call.h
index ca36052..fb53e90 100644
--- a/include/osmocom/msc/silent_call.h
+++ b/include/osmocom/msc/silent_call.h
@@ -1,15 +1,18 @@
 #ifndef _SILENT_CALL_H
 #define _SILENT_CALL_H
 
-struct ran_conn;
 struct gsm0808_channel_type;
+struct gsm_trans;
 
-extern int gsm_silent_call_start(struct vlr_subscr *vsub,
-		const struct gsm0808_channel_type *ct,
-		const char *traffic_dst_ip, uint16_t traffic_dst_port,
-		void *data);
+int gsm_silent_call_start(struct vlr_subscr *vsub,
+	const struct gsm0808_channel_type *ct,
+	const char *traffic_dst_ip, uint16_t traffic_dst_port,
+	struct vty *vty);
+
 extern int gsm_silent_call_stop(struct vlr_subscr *vsub);
 
+void trans_silent_call_free(struct gsm_trans *trans);
+
 #if 0
 extern int silent_call_rx(struct ran_conn *conn, struct msgb *msg);
 extern int silent_call_reroute(struct ran_conn *conn, struct msgb *msg);