diff --git a/include/openbsc/call_handling.h b/include/openbsc/call_handling.h
new file mode 100644
index 0000000..0202788
--- /dev/null
+++ b/include/openbsc/call_handling.h
@@ -0,0 +1,64 @@
+/*
+ * (C) 2008 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2008 by Stefan Schmidt <stefan@datenfreihafen.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef _CALL_HANDLING_H
+#define _CALL_HANDLING_H
+
+#include "linuxlist.h"
+#include "gsm_subscriber.h"
+#include "timer.h"
+
+/*
+ * State transitions to be seen from the outside
+ */
+#define CALL_STATE_NULL				0
+#define CALL_STATE_SETUP			1
+#define CALL_STATE_PROCEED 			2
+#define CALL_STATE_ALERT			3
+#define CALL_STATE_CONNECT			4
+#define CALL_STATE_ACTIVE			5
+#define CALL_STATE_RELEASE			6
+
+struct call_data {
+	struct llist_head entry;
+	void (*state_change_cb)(int oldstate, int newstate, int event, void *data);
+	void *data;
+	char *destination_number;
+
+	/* Internal */
+	int state;
+	char tmsi[GSM_TMSI_LENGTH];
+	struct timer_list t30x; /* to be added for... */
+};
+
+
+int call_initiate(struct call_data *call, char *tmsi);
+void call_abort(struct call_data *call);
+
+/**
+ * Get notified about new incoming calls. The call_data is owned
+ * and managed by the internal call handling.
+ */
+void call_set_callback(void (*cb)(struct call_data *call, void *data), void* data);
+void call_proceed(struct call_data *call_data);
+void call_connect(struct call_data *call_data);
+
+#endif /* _CALL_HANDLING_H */