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diff --git a/sys/i4b/layer3/i4b_q931.h b/sys/i4b/layer3/i4b_q931.h
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+++ b/sys/i4b/layer3/i4b_q931.h
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+/*
+ * Copyright (c) 1997, 1998 Hellmuth Michaelis. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *---------------------------------------------------------------------------
+ *
+ *	i4b_q931.h - Q931 handling header file
+ *	--------------------------------------
+ *
+ *	$Id: i4b_q931.h,v 1.5 1998/12/05 18:05:39 hm Exp $ 
+ *
+ *      last edit-date: [Sat Dec  5 18:33:53 1998]
+ *
+ *---------------------------------------------------------------------------*/
+
+#ifndef _I4B_Q931_H_
+#define _I4B_Q931_H_
+
+/* extension bit */
+
+#define EXT_LAST		0x80	/* last octett */
+
+/* reserve space in mbuf */
+
+#define I_FRAME_HDRLEN		4	/* to be added by layer 2 */
+
+/* SHIFT */
+
+#define CODESET_MASK		0x07
+#define UNSHIFTED		0
+#define SHIFTED			1
+#define CRLENGTH_MASK		0x0f
+
+/* CONNECT */
+
+#define MSG_CONNECT_LEN		4	/* length of a connect message */
+
+/* DISCONNECT */
+
+#define MSG_DISCONNECT_LEN	8	/* length of a disconnect message */
+
+/* RELEASE COMPLETE */
+
+#define MSG_RELEASE_COMPLETE_LEN 8	/* length of release complete msg */
+
+/* for outgoing causes */
+
+#define CAUSE_LEN		2
+#define CAUSE_STD_LOC_OUT	0x80	/* std = CCITT, loc = user */
+
+/* SETUP */
+
+#define MSG_SETUP_LEN		18	/* without number strings ! */
+
+#define IEI_BEARERCAP_LEN	2	/* 2 octetts lenght */
+
+#define IT_CAP_SPEECH		0x80	/* BC: information xfer capability */
+#define IT_CAP_UNR_DIG_INFO	0x88	/* BC: information xfer capability */
+
+#define	IT_RATE_64K		0x90	/* BC: information xfer rate */
+#define	IT_UL1_G711A		0xa3	/* layer1 proto G.711 A-law */
+
+#define IEI_CHANNELID_LEN	0x01    /* length of channel id		*/
+#define	CHANNELID_B1		0x81	/* channel = B1 (outgoing) */
+#define	CHANNELID_B2		0x82	/* channel = B2 (outgoing) */
+#define	CHANNELID_ANY		0x83	/* channel = any channel (outgoing) */
+
+#define IE_CHAN_ID_NO		0x00	/* no channel (incoming)	*/
+#define IE_CHAN_ID_B1		0x01	/* B1 channel (incoming)	*/
+#define IE_CHAN_ID_B2		0x02	/* B2 channel (incoming)	*/
+#define IE_CHAN_ID_ANY		0x03	/* ANY channel (incoming)	*/
+
+#define	NUMBER_TYPEPLAN		0x81    /* type of number/numbering plan */
+
+#define IEI_CALLINGPN_LEN	1	/* without number string ! */
+
+#define IEI_CALLEDPN_LEN	1	/* without number string ! */
+
+/* CONNECT_ACK */
+
+#define MSG_CONNECT_ACK_LEN	4	/* length of a connect ack message */
+
+/* STATUS */
+
+#define MSG_STATUS_LEN		11
+#define CALLSTATE_LEN		1
+
+/* RELEASE */
+
+#define MSG_RELEASE_LEN		8	/* length of release msg */
+
+/* ALERT */
+
+#define MSG_ALERT_LEN		4	/* length of a alert message */
+
+#endif /* _I4B_Q931_H_ */