diff --git a/include/mtp_level3.h b/include/mtp_level3.h
new file mode 100644
index 0000000..46cde40
--- /dev/null
+++ b/include/mtp_level3.h
@@ -0,0 +1,164 @@
+/* Q.701-Q.704, Q.706, Q.707 handling code */
+/*
+ * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2010 by On-Waves
+ * 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 mtp_level3_h
+#define mtp_level3_h
+
+#include <endian.h>
+#include <sys/types.h>
+
+
+/*
+ * pssible service information octets..
+ */
+#define MTP_NI_NATION_NET	0x02
+
+#define MTP_SI_MNT_SNM_MSG	0x00
+#define MTP_SI_MNT_REG_MSG	0x01
+#define MTP_SI_MNT_SCCP		0x03
+
+/*
+ * h0 contains the group, h1 the semantic of it
+ */
+
+#define MTP_TST_MSG_GRP		0x01
+#define MTP_PROHIBIT_MSG_GRP	0x04
+#define MTP_TRF_RESTR_MSG_GRP	0x07
+
+/* h1 values for different groups */
+#define MTP_TST_MSG_SLTM	0x01
+#define MTP_TST_MSG_SLTA	0x02
+
+#define MTP_RESTR_MSG_ALLWED	0x01
+
+#define MTP_PROHIBIT_MSG_SIG	0x01
+
+
+#define SCCP_SST	0x03
+#define SCCP_SSA	0x01
+
+#define MTP_LINK_MASK	    0x0F
+#define MTP_ADDR_MASK	    0x0FFF
+#define MTP_APOC_MASK 0x3f
+
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define MTP_LINK_SLS(addr) ((addr >>28) & MTP_LINK_MASK)
+#define MTP_ADDR(link, dpc, opc) \
+	(((dpc)  & MTP_ADDR_MASK) << 0 |  \
+	 ((opc)  & MTP_ADDR_MASK) << 14|  \
+	 ((link) & MTP_LINK_MASK) << 28)
+#define MTP_MAKE_APOC(apoc) \
+	(apoc & 0x3fff)
+#elif __BYTE_ORDER == __BIG_ENDIAN
+static inline u_int32_t c_swap_32(u_int32_t in)
+{
+	return 	(((in & 0x000000ff) << 24) |
+		((in & 0x0000ff00) <<  8) |
+		((in & 0x00ff0000) >>  8) |
+	        ((in & 0xff000000) >> 24));
+}
+static inline u_int16_t c_swap_16(u_int16_t in)
+{
+	return (((in & 0x00ff) << 8) |
+		 (in & 0xff00) >> 8);
+}
+#define MTP_LINK_SLS(addr) ((c_swap_32(addr)>>28) & MTP_LINK_MASK)
+#define MTP_ADDR(link, dpc, opc) \
+        c_swap_32(((dpc)  & MTP_ADDR_MASK) << 0 |  \
+         ((opc)  & MTP_ADDR_MASK) << 14|  \
+         ((link) & MTP_LINK_MASK) << 28)
+#define MTP_MAKE_APOC(apoc) \
+	c_swap_16((apoc & 0x3fff))
+#endif
+
+
+
+/*
+ * not the on wire address...
+ */
+struct mtp_addr {
+	u_int16_t dpc;
+	u_int16_t opc;
+	u_int8_t link;
+} __attribute__((packed));
+
+/*
+ * the struct is defined in Q.704 and can be seen in the
+ * wireshark dissectors too
+ */
+struct mtp_level_3_hdr {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	u_int8_t ser_ind : 4,
+		 spare : 2,
+		 ni : 2;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+	u_int8_t ni : 2,
+		 spare : 2,
+		 ser_ind : 4;
+#endif
+	u_int32_t addr;
+	u_int8_t data[0];
+} __attribute__((packed));
+
+struct mtp_level_3_cmn {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	u_int8_t h0 : 4,
+		 h1 : 4;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+	u_int8_t h1 : 4,
+		 h0 : 4;
+#endif
+} __attribute__((packed));
+
+struct mtp_level_3_mng {
+	struct mtp_level_3_cmn  cmn;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	u_int8_t spare : 4,
+		 length : 4;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+	u_int8_t length : 4,
+		 spare : 4;
+#endif
+	u_int8_t data[0];
+} __attribute__((packed));
+
+struct mtp_level_3_prohib {
+	struct mtp_level_3_cmn  cmn;
+
+	u_int16_t apoc;
+} __attribute__((packed));
+
+struct sccp_con_ctrl_prt_mgt {
+	u_int8_t sst;
+	u_int8_t assn; /* affected sub system number */
+	u_int16_t apoc;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	u_int8_t mul_ind : 2,
+		 spare : 6;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+	u_int8_t spare : 6,
+		 mul_ind : 2;
+#endif
+} __attribute__((packed));
+
+#endif