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diff --git a/kernel/drivers/isdn/pcbit/edss1.h b/kernel/drivers/isdn/pcbit/edss1.h
new file mode 100644
index 000000000..2f6b3a8ed
--- /dev/null
+++ b/kernel/drivers/isdn/pcbit/edss1.h
@@ -0,0 +1,99 @@
+/*
+ * DSS.1 module definitions
+ *
+ * Copyright (C) 1996 Universidade de Lisboa
+ *
+ * Written by Pedro Roque Marques (roque@di.fc.ul.pt)
+ *
+ * This software may be used and distributed according to the terms of
+ * the GNU General Public License, incorporated herein by reference.
+ */
+
+#ifndef EDSS1_H
+#define EDSS1_H
+
+/* ISDN states */
+
+#define ST_NULL      0
+#define ST_CALL_INIT 1    /* Call initiated */
+#define ST_OVER_SEND 2    /* Overlap sending - Requests More Info 4 call */
+#define ST_CALL_PROC 3    /* Call Proceeding */
+#define ST_CALL_DELV 4
+#define ST_CALL_PRES 6    /* Call Present - Received CONN.IND */
+#define ST_CALL_RECV 7    /* Alerting sent */
+#define ST_CONN_REQ  8    /* Answered - waiting 4 CONN.CONF */
+#define ST_INCM_PROC 9
+#define ST_ACTIVE    10
+#define ST_DISC_REQ  11
+#define ST_DISC_IND  12
+#define ST_SUSP_REQ  15
+#define ST_RESM_REQ  17
+#define ST_RELS_REQ  19
+#define ST_OVER_RECV 25
+
+#define ST_ACTIVE_SELP 26 /* Select protocol on B-Channel */
+#define ST_ACTIVE_ACTV 27 /* Activate B-channel protocol  */
+
+#define MAX_STATE ST_ACTIVE_ACTV
+
+#define EV_NULL               0
+#define EV_USR_SETUP_REQ      1
+#define EV_USR_SETUP_RESP     2
+#define EV_USR_PROCED_REQ     3
+#define EV_USR_RELEASE_REQ    4
+#define EV_USR_REJECT_REQ     4
+
+#define EV_NET_SETUP          16
+#define EV_NET_CALL_PROC      17
+#define EV_NET_SETUP_ACK      18
+#define EV_NET_CONN           19
+#define EV_NET_CONN_ACK       20
+
+#define EV_NET_SELP_RESP      21
+#define EV_NET_ACTV_RESP      22
+
+#define EV_NET_DISC           23
+#define EV_NET_RELEASE        24
+#define EV_NET_RELEASE_COMP   25
+
+#define EV_TIMER              26
+#define EV_ERROR              32
+
+/*
+ *  Cause values
+ *  only the ones we use
+ */
+
+#define CAUSE_NORMAL          0x10U
+#define CAUSE_NOCHAN          0x22U
+
+struct callb_data {
+	unsigned short type;
+	union {
+		struct ConnInfo {
+			char *CalledPN;
+			char *CallingPN;
+		} setup;
+		unsigned short cause;
+	} data;
+};
+
+struct fsm_entry {
+	unsigned short init;
+	unsigned short final;
+	unsigned short event;
+	void (*callb)(struct pcbit_dev *, struct pcbit_chan *, struct callb_data*);
+};
+
+struct fsm_timer_entry {
+	unsigned short init;
+	unsigned long timeout;          /* in seconds */
+};
+
+extern const char * const isdn_state_table[];
+
+void pcbit_fsm_event(struct pcbit_dev *, struct pcbit_chan *,
+		     unsigned short event, struct callb_data *);
+char *strisdnevent(ushort ev);
+
+#endif