From Samuel Qu, Michael Lum, and Jeff Morriss: TCAP support, and

"asn_id_decode1()" variant of "asn_id_decode()".

svn path=/trunk/; revision=8586

1 files changed, 2789 insertions, 0 deletions

diff --git a/packet-tcap.c b/packet-tcap.c
new file mode 100644
index 0000000000..497c3115a0
--- /dev/null
+++ b/packet-tcap.c
@@ -0,0 +1,2789 @@
+/* packet-tcap.c
+ * Routines for TCAP dissection
+ *
+ * Copyright 2000, Samuel Qu <samuel.qu [AT] utstar.com>,
+ *
+ * Michael Lum <mlum [AT] telostech.com>,
+ * Modified for ANSI TCAP support and many changes for
+ * EOC matching.  (2003)
+ *
+ * (append your name here for newer version)
+ *
+ * $Id: packet-tcap.c,v 1.1 2003/10/02 06:13:28 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from WHATEVER_FILE_YOU_USED (where "WHATEVER_FILE_YOU_USED"
+ * is a dissector file; if you just copied this from README.developer,
+ * don't bother with the "Copied from" - you don't even need to put
+ * in a "Copied from" if you copied an existing dissector, especially
+ * if the bulk of the code in the new dissector is your code)
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <gmodule.h>
+
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+
+#include <glib.h>
+
+#ifdef NEED_SNPRINTF_H
+# include "snprintf.h"
+#endif
+
+#include <epan/packet.h>
+#include "prefs.h"
+#include "packet-tcap.h"
+#include "asn1.h"
+
+Tcap_Standard_Type tcap_standard = ITU_TCAP_STANDARD;
+
+void proto_reg_handoff_tcap(void);
+
+/* saved pinfo */
+static packet_info *g_pinfo = NULL;
+static proto_tree *g_tcap_tree = NULL;
+static gboolean g_tcap_ends_def_len = FALSE;
+
+/* Initialize the protocol and registered fields */
+static int proto_tcap = -1;
+static int hf_tcap_message_type = -1;
+static int hf_ansi_tcap_message_type = -1;
+static int hf_tcap_none = -1;
+static int hf_tcap_tag = -1;
+static int hf_tcap_length = -1;
+static int hf_tcap_bytes = -1;
+static int hf_tcap_app_con_name = -1;
+static int hf_tcap_id = -1;
+static int hf_tcap_tid = -1;
+static int hf_tcap_ssn = -1; /* faked */
+static int hf_tcap_dlg_type = -1;
+static int hf_tcap_cmp_type = -1;
+static int hf_ansi_tcap_cmp_type = -1;
+static int hf_tcap_int = -1;
+
+/* Initialize the subtree pointers */
+static gint ett_tcap = -1;
+/* Samuel */
+static gint ett_otid = -1;
+static gint ett_dtid = -1;
+static gint ett_dlg_portion = -1;
+static gint ett_dlg_req = -1;
+static gint ett_dlg_rsp = -1;
+static gint ett_dlg_abrt = -1;
+static gint ett_cmp_portion = -1;
+static gint ett_reason = -1;
+static gint ett_component = -1;
+static gint ett_problem = -1;
+static gint ett_error = -1;
+static gint ett_params = -1;
+static gint ett_param = -1;
+
+static dissector_handle_t data_handle;
+static dissector_table_t tcap_itu_ssn_dissector_table; /* map use ssn in sccp */
+static dissector_table_t tcap_ansi_ssn_dissector_table; /* map use ssn in sccp */
+static gboolean lock_info_col = TRUE;
+
+#define TC_SEQ_TAG 0x30
+#define TC_SET_TAG 0x31
+
+#define TC_EOC_LEN	2 /* 0x00 0x00 */
+
+/* TCAP transaction message type definition - Samuel */
+#define ST_MSG_TYP_UNI 0x61 /*0b01100001*/
+#define ST_MSG_TYP_BGN 0x62 /*0b01100010*/
+#define ST_MSG_TYP_CNT 0x65 /*0b01100101*/
+#define ST_MSG_TYP_END 0x64 /*0b01100100*/
+#define ST_MSG_TYP_PABT 0x67 /*0b01100111*/
+static const value_string msg_type_strings[] = {
+	{ ST_MSG_TYP_UNI, "TC-UNI" },
+	{ ST_MSG_TYP_BGN, "TC-BEGIN" },
+	{ ST_MSG_TYP_CNT, "TC-CONTINUE" },
+	{ ST_MSG_TYP_END, "TC-END" },
+	{ ST_MSG_TYP_PABT, "TC-PABORT" },
+	{ 0, NULL },
+};
+
+/* ANSI TCAP transaction message type definition */
+#define ANSI_ST_MSG_TYP_UNI 0xe1
+#define ANSI_ST_MSG_TYP_QWP 0xe2
+#define ANSI_ST_MSG_TYP_QWOP 0xe3
+#define ANSI_ST_MSG_TYP_RSP 0xe4
+#define ANSI_ST_MSG_TYP_CWP 0xe5
+#define ANSI_ST_MSG_TYP_CWOP 0xe6
+#define ANSI_ST_MSG_TYP_PABT 0xf6
+static const value_string ansi_msg_type_strings[] = {
+	{ ANSI_ST_MSG_TYP_UNI, "TC-UNI" },
+	{ ANSI_ST_MSG_TYP_QWP, "TC-QUERY W PERM" },
+	{ ANSI_ST_MSG_TYP_QWOP, "TC-QUERY WO PERM" },
+	{ ANSI_ST_MSG_TYP_RSP, "TC-RESPONSE" },
+	{ ANSI_ST_MSG_TYP_CWP, "TC-CONV W PERM" },
+	{ ANSI_ST_MSG_TYP_CWOP, "TC-CONV WO PERM" },
+	{ ANSI_ST_MSG_TYP_PABT, "TC-PABORT" },
+	{ 0, NULL },
+};
+
+#define ST_ANSI_CMP_TAG 0xe8
+#define ST_ANSI_TID_TAG 0xc7
+
+/* TCAP TID tag value - Samuel */
+#define ST_TID_SOURCE 0
+#define ST_TID_DEST 1
+#define ST_ITU_ORG_TID_TAG 0x48 /*0b01001000*/
+#define ST_ITU_DST_TID_TAG 0x49 /*0b01001001*/
+#define ST_ITU_PABT_TAG 0x4a /*0b01001010*/
+#define ST_ITU_DLG_TAG 0x6b
+#define ST_ITU_CMP_TAG 0x6c
+
+static const value_string tid_strings[] = {
+	{ ST_ITU_ORG_TID_TAG, "Source Transaction ID" },
+	{ ST_ITU_DST_TID_TAG, "Destination Transaction ID" },
+	{ 0, NULL },
+};
+
+/* TCAP dialog type */
+#define TC_DLG_REQ 0x60
+#define TC_DLG_RSP 0x61
+#define TC_DLG_ABRT 0x64
+
+static const value_string dlg_type_strings[] = {
+	{ TC_DLG_REQ , "Dialogue Request" },
+	{ TC_DLG_RSP , "Dialogue Response" },
+	{ TC_DLG_ABRT, "Dialogue Abort" },
+	{ 0, NULL },
+};
+
+/* TCAP component type */
+#define TC_INVOKE 0xa1
+#define TC_RRL 0xa2
+#define TC_RE 0xa3
+#define TC_REJECT 0xa4
+#define TC_RRN 0xa7
+
+static const value_string cmp_type_strings[] = {
+	{ TC_INVOKE, "Invoke" },
+	{ TC_RRL, "Return Result(Last)" },
+	{ TC_RE, "Return Error" },
+	{ TC_REJECT, "Reject" },
+	{ TC_RRN, "Return Result(Not Last)" },
+	{ 0, NULL },
+};
+
+/* ANSI TCAP component type */
+#define ANSI_TC_INVOKE_L 0xe9
+#define ANSI_TC_RRL 0xea
+#define ANSI_TC_RE 0xeb
+#define ANSI_TC_REJECT 0xec
+#define ANSI_TC_INVOKE_N 0xed
+#define ANSI_TC_RRN 0xee
+
+static const value_string ansi_cmp_type_strings[] = {
+	{ ANSI_TC_INVOKE_L, "Invoke(Last)" },
+	{ ANSI_TC_RRL, "Return Result(Last)" },
+	{ ANSI_TC_RE, "Return Error" },
+	{ ANSI_TC_REJECT, "Reject" },
+	{ ANSI_TC_INVOKE_N, "Invoke(Not Last)" },
+	{ ANSI_TC_RRN, "Return Result(Not Last)" },
+	{ 0, NULL },
+};
+
+
+#define TC_DS_OK 1
+#define TC_DS_FAIL 0
+
+/* dissect length */
+static int
+dissect_tcap_len(ASN1_SCK *asn1, proto_tree *tree, gboolean *def_len, guint *len)
+{
+    guint saved_offset;
+    int ret;
+
+    saved_offset = asn1->offset;
+    *len = 0;
+    *def_len = FALSE;
+    ret = asn1_length_decode(asn1, def_len, len);
+
+    if (*def_len)
+    {
+	proto_tree_add_uint(tree, hf_tcap_length, asn1->tvb, saved_offset, asn1->offset - saved_offset, *len);
+    }
+    else
+    {
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb,
+	    saved_offset, asn1->offset - saved_offset, "Length: Indefinite");
+    }
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_eoc(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint saved_offset, ret;
+
+    saved_offset = asn1->offset;
+
+    if (tvb_length_remaining(asn1->tvb, saved_offset) <= 0)
+    {
+	return TC_DS_FAIL;
+    }
+
+    if (!asn1_eoc(asn1, -1))
+    {
+	return TC_DS_FAIL;
+    }
+
+    ret = asn1_eoc_decode(asn1, -1);
+
+    proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb,
+	saved_offset, asn1->offset - saved_offset, "End of Contents");
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_tag(ASN1_SCK *asn1, proto_tree *tree, guint *tag, guchar * str)
+{
+    guint saved_offset, real_tag;
+
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &real_tag);
+    if ((*tag != (guint) -1) && (real_tag != *tag))
+    {
+	asn1->offset = saved_offset;
+	return TC_DS_FAIL;
+    }
+    proto_tree_add_uint_format(tree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+	    real_tag, str);
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_octet(ASN1_SCK *asn1, proto_tree *tree, guchar * str)
+{
+    guint saved_offset;
+    guchar my_oct;
+
+    saved_offset = asn1->offset;
+    asn1_octet_decode(asn1, &my_oct);
+    proto_tree_add_uint_format(tree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+					    my_oct, "%s %d", str, my_oct);
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_integer(ASN1_SCK *asn1, proto_tree *tree, guint len, guchar * str)
+{
+    guint saved_offset;
+    gint32 invokeId;
+
+    saved_offset = asn1->offset;
+    asn1_int32_value_decode(asn1, len, &invokeId);
+    proto_tree_add_int_format(tree, hf_tcap_int, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+					    invokeId, "%s %d", str, invokeId);
+    return TC_DS_OK;
+}
+
+static gboolean
+check_tcap_tag(ASN1_SCK *asn1, guint tag)
+{
+    guint saved_offset, real_tag;
+
+    if (tvb_length_remaining(asn1->tvb, asn1->offset) <= 0)
+    {
+	return (FALSE);
+    }
+
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &real_tag);
+    asn1->offset = saved_offset;
+    return (tag == real_tag);
+}
+
+/* dissect tid */
+static int
+dissect_tcap_tid(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti, int type)
+{
+    guint saved_offset, org_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *tid_item;
+    proto_tree *subtree;
+    guchar *poctets;
+    guint32 val;
+    gboolean def_len;
+
+    org_offset = asn1->offset;
+    if ( ST_TID_SOURCE == type)
+    {
+	tid_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, asn1->offset, -1, "Source Transaction ID");
+	subtree = proto_item_add_subtree(tid_item, ett_otid);
+    }
+    else
+    {
+	tid_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, asn1->offset, -1, "Destination Transaction ID");
+	subtree = proto_item_add_subtree(tid_item, ett_dtid);
+    }
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+    proto_tree_add_uint(subtree, hf_tcap_tid, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag);
+
+    /* error handling */
+    switch(type)
+    {
+    case ST_TID_SOURCE:
+	if (ST_ITU_ORG_TID_TAG != tag)
+	{
+	    asn1->offset = saved_offset;
+	    return TC_DS_FAIL;
+	}
+	break;
+    case ST_TID_DEST:
+	if (ST_ITU_DST_TID_TAG != tag)
+	{
+	    asn1->offset = saved_offset;
+	    return TC_DS_FAIL;
+	}
+	break;
+    default:
+	break;
+    }
+
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+    saved_offset = asn1->offset;
+    ret = asn1_string_value_decode(asn1, len, &poctets);
+    val = 0;
+    memcpy(&val, poctets, len);
+
+    ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
+    g_free(poctets);
+
+    proto_item_set_len(tid_item, asn1->offset - org_offset);
+
+    if (type == ST_TID_DEST)
+    {
+	if (check_col(g_pinfo->cinfo, COL_INFO))
+	    col_append_fstr(g_pinfo->cinfo, COL_INFO, "dtid(%x) ", val);
+    }
+    else
+    {
+	if (check_col(g_pinfo->cinfo, COL_INFO))
+	    col_append_fstr(g_pinfo->cinfo, COL_INFO, "stid(%x) ", val);
+    }
+
+    return TC_DS_OK;
+}
+
+/* Samuel */
+/* dissect operation portion */
+static int
+dissect_tcap_invokeId(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    guint tag;
+    gboolean def_len;
+
+#define INVOKE_ID_TAG 0x2
+    if (check_tcap_tag(asn1, INVOKE_ID_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Invoke ID Tag");
+	dissect_tcap_len(asn1, tree, &def_len, &len);
+	dissect_tcap_integer(asn1, tree, len, "Invoke ID:");
+    }
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_lnkId(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    guint tag;
+    gboolean def_len;
+
+#define LINK_ID_TAG 0x80
+    if (check_tcap_tag(asn1, LINK_ID_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Linked ID Tag");
+	dissect_tcap_len(asn1, tree, &def_len, &len);
+	dissect_tcap_integer(asn1, tree, len, "Linked ID:");
+    }
+
+    return TC_DS_OK;
+}
+
+static void
+dissect_tcap_opr_code(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    guint tag;
+    gboolean got_it = FALSE;
+    gboolean def_len;
+
+#define TCAP_LOC_OPR_CODE_TAG 0x02
+    if (check_tcap_tag(asn1, TCAP_LOC_OPR_CODE_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Local Operation Code Tag");
+	got_it = TRUE;
+    }
+#define TCAP_GLB_OPR_CODE_TAG 0x06
+    else if (check_tcap_tag(asn1, TCAP_GLB_OPR_CODE_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Global Operation Code Tag");
+	got_it = TRUE;
+    }
+
+    if (got_it)
+    {
+	dissect_tcap_len(asn1, tree, &def_len, &len);
+
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, asn1->offset, len, "Operation Code");
+
+	asn1->offset += len;
+    }
+}
+
+static int
+dissect_tcap_param(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint off_tree[100], saved_offset, len_offset;
+    int num_seq;
+    guint tag, len;
+    gboolean def_len;
+    proto_item *item_tree[100], *item;
+    proto_tree *seq_tree[100], *use_tree, *subtree;
+
+    num_seq = 0;
+    use_tree = tree;
+
+#define TC_INVALID_TAG 0
+    while ((tvb_length_remaining(asn1->tvb, asn1->offset) > 0) &&
+	(!check_tcap_tag(asn1, 0)))
+    {
+	saved_offset = asn1->offset;
+	asn1_id_decode1(asn1, &tag);
+	len_offset = asn1->offset;
+	asn1_length_decode(asn1, &def_len, &len);
+
+	if (tag == TC_SEQ_TAG)
+	{
+	    item =
+		proto_tree_add_none_format(use_tree, hf_tcap_none, asn1->tvb,
+		    saved_offset, -1, "Sequence");
+
+	    subtree = proto_item_add_subtree(item, ett_params);
+
+	    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+		saved_offset, len_offset - saved_offset, tag, "Sequence Tag");
+
+	    if (!def_len)
+	    {
+		proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+		    len_offset, asn1->offset - len_offset, "Length: Indefinite");
+
+		seq_tree[num_seq] = subtree;
+		item_tree[num_seq] = item;
+		off_tree[num_seq] = saved_offset;
+		num_seq++;
+	    }
+	    else
+	    {
+		proto_tree_add_uint(subtree, hf_tcap_length, asn1->tvb,
+		    len_offset, asn1->offset - len_offset, len);
+
+		proto_item_set_len(item, (asn1->offset - saved_offset) + len);
+	    }
+
+	    use_tree = subtree;
+	    continue;
+	}
+
+	if (!def_len)
+	{
+	    proto_tree_add_uint_format(use_tree, hf_tcap_tag, asn1->tvb,
+		saved_offset, len_offset - saved_offset, tag, "Parameter Tag");
+	    proto_tree_add_none_format(use_tree, hf_tcap_none, asn1->tvb,
+		len_offset, asn1->offset - len_offset, "Length: Indefinite");
+
+	    seq_tree[num_seq] = use_tree;
+	    item_tree[num_seq] = NULL;
+	    num_seq++;
+	    continue;
+	}
+	else
+	{
+	    item =
+		proto_tree_add_none_format(use_tree, hf_tcap_none, asn1->tvb,
+		    saved_offset, -1, "Parameter");
+
+	    subtree = proto_item_add_subtree(item, ett_param);
+
+	    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+		saved_offset, len_offset - saved_offset, tag, "Parameter Tag");
+
+	    proto_tree_add_uint(subtree, hf_tcap_length, asn1->tvb,
+		len_offset, asn1->offset - len_offset, len);
+
+	    proto_item_set_len(item, (asn1->offset - saved_offset) + len);
+
+	    proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+		asn1->offset, len, "Parameter Data");
+
+	    asn1->offset += len;
+	}
+
+	if (tvb_length_remaining(asn1->tvb, asn1->offset) <=0) break;
+
+	while ((num_seq > 0) &&
+	    asn1_eoc(asn1, -1))
+	{
+	    saved_offset = asn1->offset;
+	    asn1_eoc_decode(asn1, -1);
+
+	    proto_tree_add_none_format(seq_tree[num_seq-1], hf_tcap_none, asn1->tvb,
+		saved_offset, asn1->offset - saved_offset, "End of Contents");
+
+	    if (item_tree[num_seq-1] != NULL)
+	    {
+		proto_item_set_len(item_tree[num_seq-1], asn1->offset - off_tree[num_seq-1]);
+	    }
+
+	    num_seq--;
+	}
+    }
+
+    return TC_DS_OK;
+}
+
+static proto_tree *
+dissect_tcap_component(ASN1_SCK *asn1, proto_tree *tree, guint *len_p)
+{
+    guint saved_offset;
+    guint tag;
+    proto_item *item;
+    proto_tree *subtree;
+    gboolean def_len;
+
+
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &tag);
+
+    item =
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb,
+	    saved_offset, -1, "Component ID");
+
+    subtree = proto_item_add_subtree(item, ett_component);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+	saved_offset, asn1->offset - saved_offset, tag,
+	"Component ID Identifier");
+
+    dissect_tcap_len(asn1, subtree, &def_len, len_p);
+
+    proto_item_set_len(item, (asn1->offset - saved_offset) + *len_p);
+
+    return(subtree);
+}
+
+static void
+dissect_tcap_problem(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint orig_offset, saved_offset = 0;
+    guint len, tag_len;
+    guint tag;
+    proto_tree *subtree;
+    proto_item *item = NULL;
+    gchar *str = NULL;
+    gchar *type_str = NULL;
+    gint32 spec;
+    gboolean def_len;
+
+
+    orig_offset = asn1->offset;
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &tag);
+    tag_len = asn1->offset - saved_offset;
+
+    item =
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb,
+	    saved_offset, -1, "Problem Code");
+
+    subtree = proto_item_add_subtree(item, ett_problem);
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+    proto_item_set_len(item, (asn1->offset - saved_offset) + len);
+
+    if (len != 1)
+    {
+	proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+	    asn1->offset, len, "Unknown encoding of Problem Code");
+
+	asn1->offset += len;
+	return;
+    }
+
+    saved_offset = asn1->offset;
+    asn1_int32_value_decode(asn1, 1, &spec);
+
+    switch (tag)
+    {
+    case 0x80:
+	type_str = "General Problem";
+	switch (spec)
+	{
+	case 0: str = "Unrecognized Component"; break;
+	case 1: str = "Mistyped Component"; break;
+	case 2: str = "Badly Structured Component"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    case 0x81:
+	type_str = "Invoke";
+	switch (spec)
+	{
+	case 0: str = "Duplicate Invoke ID"; break;
+	case 1: str = "Unrecognized Operation"; break;
+	case 2: str = "Mistyped Parameter"; break;
+	case 3: str = "Resource Limitation"; break;
+	case 4: str = "Initiating Release"; break;
+	case 5: str = "Unrecognized Linked ID"; break;
+	case 6: str = "Linked Response Unexpected"; break;
+	case 7: str = "Unexpected Linked Operation"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    case 0x82:
+	type_str = "Return Result";
+	switch (spec)
+	{
+	case 0: str = "Unrecognized Invoke ID"; break;
+	case 1: str = "Return Result Unexpected"; break;
+	case 2: str = "Mistyped Parameter"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    case 0x83:
+	type_str = "Return Error";
+	switch (spec)
+	{
+	case 0: str = "Unrecognized Invoke ID"; break;
+	case 1: str = "Return Error Unexpected"; break;
+	case 2: str = "Unrecognized Error"; break;
+	case 3: str = "Unexpected Error"; break;
+	case 4: str = "Mistyped Parameter"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    default:
+	type_str = "Undefined";
+	break;
+    }
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+	orig_offset, tag_len, tag, type_str);
+
+    proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+	saved_offset, 1, "Problem Specifier %s", str);
+}
+
+
+static void
+dissect_ansi_opr_code(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    guint tag;
+    gboolean got_it = FALSE;
+    gboolean def_len;
+
+#define TCAP_NAT_OPR_CODE_TAG 0xd0
+    if (check_tcap_tag(asn1, TCAP_NAT_OPR_CODE_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "National TCAP Operation Code Identifier");
+	got_it = TRUE;
+    }
+#define TCAP_PRIV_OPR_CODE_TAG 0xd1
+    else if (check_tcap_tag(asn1, TCAP_PRIV_OPR_CODE_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Private TCAP Operation Code Identifier");
+	got_it = TRUE;
+    }
+
+    if (got_it)
+    {
+	dissect_tcap_len(asn1, tree, &def_len, &len);
+
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, asn1->offset, len, "Operation Code");
+
+	asn1->offset += len;
+    }
+}
+
+static void
+dissect_ansi_problem(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    proto_tree *subtree;
+    proto_item *item = NULL;
+    gchar *str = NULL;
+    gchar *type_str = NULL;
+    gint32 type, spec;
+    gboolean def_len;
+
+
+#define TCAP_PROB_CODE_TAG 0xd5
+    if (check_tcap_tag(asn1, TCAP_PROB_CODE_TAG))
+    {
+	str = "Problem Code Identifier";
+    }
+    else
+    {
+	/* XXX */
+	return;
+    }
+
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &tag);
+
+    item =
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb,
+	    saved_offset, -1, "Problem Code");
+
+    subtree = proto_item_add_subtree(item, ett_problem);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+	saved_offset, asn1->offset - saved_offset, tag, str);
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+    proto_item_set_len(item, (asn1->offset - saved_offset) + len);
+
+    if (len != 2)
+    {
+	proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+	    asn1->offset, len, "Unknown encoding of Problem Code");
+
+	asn1->offset += len;
+	return;
+    }
+
+    saved_offset = asn1->offset;
+    asn1_int32_value_decode(asn1, 1, &type);
+    asn1_int32_value_decode(asn1, 1, &spec);
+
+    switch (type)
+    {
+    case 0: type_str = "Not used"; break;
+
+    case 1:
+	type_str = "General";
+	switch (spec)
+	{
+	case 1: str = "Unrecognized Component Type"; break;
+	case 2: str = "Incorrect Component Portion"; break;
+	case 3: str = "Badly Structured Component Portion"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    case 2:
+	type_str = "Invoke";
+	switch (spec)
+	{
+	case 1: str = "Duplicate Invoke ID"; break;
+	case 2: str = "Unrecognized Operation Code"; break;
+	case 3: str = "Incorrect Parameter"; break;
+	case 4: str = "Unrecognized Correlation ID"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    case 3:
+	type_str = "Return Result";
+	switch (spec)
+	{
+	case 1: str = "Unrecognized Correlation ID"; break;
+	case 2: str = "Unexpected Return Result"; break;
+	case 3: str = "Incorrect Parameter"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    case 4:
+	type_str = "Return Error";
+	switch (spec)
+	{
+	case 1: str = "Unrecognized Correlation ID"; break;
+	case 2: str = "Unexpected Return Error"; break;
+	case 3: str = "Unrecognized Error"; break;
+	case 4: str = "Unexpected Error"; break;
+	case 5: str = "Incorrect Parameter"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    case 5:
+	type_str = "Transaction Portion";
+	switch (spec)
+	{
+	case 1: str = "Unrecognized Package Type"; break;
+	case 2: str = "Incorrect Transaction Portion"; break;
+	case 3: str = "Badly Structured Transaction Portion"; break;
+	case 4: str = "Unrecognized Transaction ID"; break;
+	case 5: str = "Permission to Release"; break;
+	case 6: str = "Resource Unavailable"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+	break;
+
+    default:
+	type_str = "Undefined";
+	break;
+    }
+
+    if (spec == 255) { str = "Reserved"; }
+    else if (spec == 0) { str = "Not used"; }
+
+    proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+	saved_offset, 1, "Problem Type %s", type_str);
+
+    proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+	saved_offset + 1, 1, "Problem Specifier %s", str);
+}
+
+
+static void
+dissect_ansi_error(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    proto_tree *subtree;
+    proto_item *item = NULL;
+    gchar *str = NULL;
+    gboolean def_len;
+
+
+#define TCAP_NAT_ERR_CODE_TAG 0xd3
+    if (check_tcap_tag(asn1, TCAP_NAT_ERR_CODE_TAG))
+    {
+	str = "National TCAP Error Code Identifier";
+    }
+#define TCAP_PRIV_ERR_CODE_TAG 0xd4
+    else if (check_tcap_tag(asn1, TCAP_PRIV_ERR_CODE_TAG))
+    {
+	str = "Private TCAP Error Code Identifier";
+    }
+    else
+    {
+	/* XXX */
+	return;
+    }
+
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &tag);
+
+    item =
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb,
+	    saved_offset, -1, "TCAP Error Code");
+
+    subtree = proto_item_add_subtree(item, ett_error);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+	saved_offset, asn1->offset - saved_offset, tag, str);
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+    proto_item_set_len(item, (asn1->offset - saved_offset) + len);
+
+    proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+	asn1->offset, len, "Error Code");
+
+    asn1->offset += len;
+}
+
+
+static void
+dissect_ansi_param(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    guint tag;
+    gboolean got_it = FALSE;
+    gboolean def_len;
+
+#define TCAP_PARAM_SET_TAG 0xf2
+    if (check_tcap_tag(asn1, TCAP_PARAM_SET_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Parameter Set Identifier");
+	got_it = TRUE;
+    }
+#define TCAP_PARAM_SEQ_TAG 0x30
+    else if (check_tcap_tag(asn1, TCAP_PARAM_SEQ_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Parameter Sequence Identifier");
+	got_it = TRUE;
+    }
+
+    if (got_it)
+    {
+	dissect_tcap_len(asn1, tree, &def_len, &len);
+
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, asn1->offset, len, "Parameter Data");
+
+	asn1->offset += len;
+    }
+}
+
+static void
+dissect_ansi_tcap_reject(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    proto_tree *subtree;
+
+#define COMPONENT_ID_TAG 0xcf
+    if (check_tcap_tag(asn1, COMPONENT_ID_TAG))
+    {
+	subtree = dissect_tcap_component(asn1, tree, &len);
+
+	switch (len)
+	{
+	case 1:
+	    dissect_tcap_octet(asn1, subtree, "Correlation ID:");
+	    break;
+	}
+    }
+
+    dissect_ansi_problem(asn1, tree);
+
+    dissect_ansi_param(asn1, tree);
+}
+
+static void
+dissect_ansi_tcap_re(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    proto_tree *subtree;
+
+#define COMPONENT_ID_TAG 0xcf
+    if (check_tcap_tag(asn1, COMPONENT_ID_TAG))
+    {
+	subtree = dissect_tcap_component(asn1, tree, &len);
+
+	switch (len)
+	{
+	case 1:
+	    dissect_tcap_octet(asn1, tree, "Correlation ID:");
+	    break;
+	}
+    }
+
+    dissect_ansi_error(asn1, tree);
+
+    dissect_ansi_param(asn1, tree);
+}
+
+static void
+dissect_ansi_tcap_rr(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    proto_tree *subtree;
+
+#define COMPONENT_ID_TAG 0xcf
+    if (check_tcap_tag(asn1, COMPONENT_ID_TAG))
+    {
+	subtree = dissect_tcap_component(asn1, tree, &len);
+
+	switch (len)
+	{
+	case 1:
+	    dissect_tcap_octet(asn1, tree, "Correlation ID:");
+	    break;
+	}
+    }
+
+    dissect_ansi_param(asn1, tree);
+}
+
+static void
+dissect_ansi_tcap_invoke(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint len;
+    proto_tree *subtree;
+
+#define COMPONENT_ID_TAG 0xcf
+    if (check_tcap_tag(asn1, COMPONENT_ID_TAG))
+    {
+	subtree = dissect_tcap_component(asn1, tree, &len);
+
+	switch (len)
+	{
+	case 1:
+	    dissect_tcap_octet(asn1, tree, "Invoke ID:");
+	    break;
+
+	case 2:
+	    dissect_tcap_octet(asn1, tree, "Invoke ID:");
+	    dissect_tcap_octet(asn1, tree, "Correlation ID:");
+	    break;
+	}
+    }
+
+    dissect_ansi_opr_code(asn1, tree);
+
+    dissect_ansi_param(asn1, tree);
+}
+
+static void
+dissect_tcap_invoke(ASN1_SCK *asn1, proto_tree *tree)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *item;
+    guint start = asn1->offset;
+    gboolean def_len;
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+    item = proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Components");
+    subtree = proto_item_add_subtree(item, ett_component);
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+					    tag, "Invoke Type Tag");
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+    if (def_len)
+    {
+	proto_item_set_len(item, (asn1->offset - start) + len);
+    }
+
+    dissect_tcap_invokeId(asn1, subtree);
+
+    dissect_tcap_lnkId(asn1, subtree);
+
+    dissect_tcap_opr_code(asn1, subtree);
+
+    dissect_tcap_param(asn1, subtree);
+
+    if (!def_len)
+    {
+	dissect_tcap_eoc(asn1, subtree);
+    }
+}
+
+static void
+dissect_tcap_rr(ASN1_SCK *asn1, proto_tree *tree, gchar *str)
+{
+    guint tag, len, comp_len;
+    guint saved_offset;
+    proto_item *item;
+    proto_tree *subtree;
+    gboolean def_len;
+    gboolean comp_def_len;
+
+    tag = -1;
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &tag);
+    item = proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Components");
+    subtree = proto_item_add_subtree(item, ett_component);
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+					    tag, str);
+
+    dissect_tcap_len(asn1, subtree, &comp_def_len, &comp_len);
+
+    if (comp_def_len)
+    {
+	proto_item_set_len(item, (asn1->offset - saved_offset) + comp_len);
+    }
+
+    dissect_tcap_invokeId(asn1, subtree);
+
+    tag = TC_SEQ_TAG;
+    if (check_tcap_tag(asn1, TC_SEQ_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, subtree, &tag, "Sequence Tag");
+	dissect_tcap_len(asn1, subtree, &def_len, &len);
+    }
+
+    dissect_tcap_opr_code(asn1, subtree);
+
+    dissect_tcap_param(asn1, subtree);
+
+    if (!comp_def_len)
+    {
+	dissect_tcap_eoc(asn1, subtree);
+    }
+}
+
+static int
+dissect_tcap_re(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint tag, len, comp_len;
+    guint saved_offset;
+    proto_item *item;
+    proto_tree *subtree;
+    gboolean def_len;
+
+    tag = -1;
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &tag);
+    item = proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Components");
+    subtree = proto_item_add_subtree(item, ett_component);
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+					    tag, "Return Error Type Tag");
+
+    dissect_tcap_len(asn1, subtree, &def_len, &comp_len);
+
+    if (def_len)
+    {
+	proto_item_set_len(item, (asn1->offset - saved_offset) + comp_len);
+    }
+
+    saved_offset = asn1->offset;
+    dissect_tcap_invokeId(asn1, subtree);
+
+#define TC_LOCAL_ERR_CODE_TAG 0x2
+#define TC_GBL_ERR_CODE_TAG 0x6
+    if (check_tcap_tag(asn1, TC_LOCAL_ERR_CODE_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, subtree, &tag, "Local Error Code Tag");
+    }
+    else if (check_tcap_tag(asn1, TC_GBL_ERR_CODE_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, subtree, &tag, "Global Error Code Tag");
+    }
+    else
+    {
+	proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb, asn1->offset, comp_len,
+	    "Unknown Error Code");
+
+	asn1->offset += (comp_len - (asn1->offset - saved_offset));
+	return(TC_DS_OK);
+    }
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+    dissect_tcap_integer(asn1, subtree, len, "Error Code:");
+
+    dissect_tcap_param(asn1, subtree);
+
+    if (!def_len)
+    {
+	dissect_tcap_eoc(asn1, subtree);
+    }
+
+    return(TC_DS_OK);
+}
+
+static void
+dissect_tcap_reject(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint tag, comp_len;
+    guint saved_offset;
+    proto_item *item;
+    proto_tree *subtree;
+    gboolean def_len;
+
+    tag = -1;
+
+    saved_offset = asn1->offset;
+    asn1_id_decode1(asn1, &tag);
+
+    item = proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Components");
+
+    subtree = proto_item_add_subtree(item, ett_component);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+					    tag, "Reject Type Tag");
+
+    dissect_tcap_len(asn1, subtree, &def_len, &comp_len);
+
+    if (def_len)
+    {
+	proto_item_set_len(item, (asn1->offset - saved_offset) + comp_len);
+    }
+
+    dissect_tcap_invokeId(asn1, subtree);
+
+    dissect_tcap_problem(asn1, tree);
+
+    if (!def_len)
+    {
+	dissect_tcap_eoc(asn1, subtree);
+    }
+}
+
+static void
+dissect_ansi_tcap_next_tvb(ASN1_SCK *asn1, guint len, proto_tree *tree)
+{
+    tvbuff_t *next_tvb;
+    guint saved_offset;
+    int ret;
+    gboolean flag = TRUE;
+    guint tag;
+    proto_item *item, *tag_item;
+    proto_tree *subtree, *tag_subtree;
+    gboolean def_len;
+
+
+    if (lock_info_col) col_set_fence(g_pinfo->cinfo, COL_INFO);
+
+    next_tvb = tvb_new_subset(asn1->tvb, asn1->offset, len, len);
+
+    /* process components data */
+    if (!dissector_try_port(tcap_ansi_ssn_dissector_table, g_pinfo->match_port, next_tvb, g_pinfo, g_tcap_tree))
+    {
+	/* dissect cmp */
+
+	saved_offset = asn1->offset;
+	ret = asn1_id_decode1(asn1, &tag);
+
+	/*
+	 * verify tag type is known
+	 */
+	switch (tag)
+	{
+	case ANSI_TC_INVOKE_L :
+	case ANSI_TC_RRL :
+	case ANSI_TC_RE :
+	case ANSI_TC_REJECT :
+	case ANSI_TC_INVOKE_N :
+	case ANSI_TC_RRN :
+	    flag = TRUE;
+	    break;
+
+	default:
+	    flag = FALSE;
+	    break;
+	}
+
+	if (flag != FALSE)
+	{
+	    item = proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Components");
+	    subtree = proto_item_add_subtree(item, ett_component);
+
+	    switch (tag)
+	    {
+	    case ANSI_TC_INVOKE_L :
+		tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
+			    asn1->offset - saved_offset, tag, "Invoke(Last)");
+		dissect_tcap_len(asn1, subtree, &def_len, &len);
+		tag_subtree = proto_item_add_subtree(tag_item, ett_component);
+
+		dissect_ansi_tcap_invoke(asn1, tag_subtree);
+		break;
+	    case ANSI_TC_RRL :
+		tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
+			    asn1->offset - saved_offset, tag, "Return Result(Last)");
+		dissect_tcap_len(asn1, subtree, &def_len, &len);
+		tag_subtree = proto_item_add_subtree(tag_item, ett_component);
+
+		dissect_ansi_tcap_rr(asn1, tag_subtree);
+		break;
+	    case ANSI_TC_RE :
+		tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
+			    asn1->offset - saved_offset, tag, "Return Error");
+		dissect_tcap_len(asn1, subtree, &def_len, &len);
+		tag_subtree = proto_item_add_subtree(tag_item, ett_component);
+
+		dissect_ansi_tcap_re(asn1, tag_subtree);
+		break;
+	    case ANSI_TC_REJECT :
+		tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
+			    asn1->offset - saved_offset, tag, "Reject");
+		dissect_tcap_len(asn1, subtree, &def_len, &len);
+		tag_subtree = proto_item_add_subtree(tag_item, ett_component);
+
+		dissect_ansi_tcap_reject(asn1, tag_subtree);
+		break;
+	    case ANSI_TC_INVOKE_N :
+		tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
+			    asn1->offset - saved_offset, tag, "Invoke(Not Last)");
+		dissect_tcap_len(asn1, subtree, &def_len, &len);
+		tag_subtree = proto_item_add_subtree(tag_item, ett_component);
+
+		dissect_ansi_tcap_invoke(asn1, tag_subtree);
+		break;
+	    case ANSI_TC_RRN :
+		tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
+			    asn1->offset - saved_offset, tag, "Return Result(Not Last)");
+		dissect_tcap_len(asn1, subtree, &def_len, &len);
+		tag_subtree = proto_item_add_subtree(tag_item, ett_component);
+
+		dissect_ansi_tcap_rr(asn1, tag_subtree);
+		break;
+	    }
+
+	    proto_item_set_len(item, asn1->offset - saved_offset);
+	}
+    }
+
+    if (!flag)
+    {
+	/* No sub-dissection occured, treat it as raw data */
+	call_dissector(data_handle, next_tvb, g_pinfo, g_tcap_tree);
+    }
+}
+
+static void
+dissect_tcap_next_tvb(ASN1_SCK *asn1, guint len, proto_tree *tree)
+{
+    tvbuff_t *next_tvb;
+    guint saved_offset;
+    int ret;
+    guint tag;
+
+    if (lock_info_col) col_set_fence(g_pinfo->cinfo, COL_INFO);
+
+    next_tvb = tvb_new_subset(asn1->tvb, asn1->offset, len, len);
+
+    /* process components data */
+    if (dissector_try_port(tcap_itu_ssn_dissector_table, g_pinfo->match_port, next_tvb, g_pinfo, g_tcap_tree))
+    {
+	asn1->offset += len;
+    }
+    else
+    {
+	saved_offset = asn1->offset;
+	ret = asn1_id_decode1(asn1, &tag);
+	asn1->offset = saved_offset;
+
+	switch (tag)
+	{
+	case TC_INVOKE :
+	    dissect_tcap_invoke(asn1, tree);
+	    break;
+	case TC_RRL :
+	    dissect_tcap_rr(asn1, tree, "Return Result(Last) Type Tag");
+	    break;
+	case TC_RE :
+	    dissect_tcap_re(asn1, tree);
+	    break;
+	case TC_REJECT :
+	    dissect_tcap_reject(asn1, tree);
+	    break;
+	case TC_RRN :
+	    /* same definition as RRL */
+	    dissect_tcap_rr(asn1, tree, "Return Result(Not Last) Type Tag");
+	    break;
+	default:
+	    /* treat it as raw data */
+	    call_dissector(data_handle, next_tvb, g_pinfo, g_tcap_tree);
+	    break;
+	}
+    }
+}
+
+static int
+dissect_tcap_components(ASN1_SCK *asn1, proto_tree *tcap_tree)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len, next_tvb_len;
+    guint tag;
+    int ret;
+    proto_item *cmp_item;
+    guint cmp_start = asn1->offset;
+    gboolean def_len;
+
+    if (tvb_length_remaining(asn1->tvb, asn1->offset) <= 0)
+    {
+	return TC_DS_FAIL;
+    }
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    if (ST_ITU_CMP_TAG != tag)
+    {
+	asn1->offset = saved_offset;
+	return TC_DS_FAIL;
+    }
+
+    cmp_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Components Portion");
+    subtree = proto_item_add_subtree(cmp_item, ett_cmp_portion);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
+				    "Component Portion Tag");
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+    if (def_len)
+    {
+	proto_item_set_len(cmp_item, (asn1->offset - cmp_start) + len);
+    }
+
+    /* call next dissector */
+
+    if (!def_len)
+    {
+	/*
+	 * take remaining length minus the EOC for the indefinite
+	 * component length
+	 */
+	next_tvb_len =
+	    tvb_length_remaining(asn1->tvb, asn1->offset) - TC_EOC_LEN;
+    }
+    else
+    {
+	next_tvb_len = len;
+    }
+
+    /*
+     * take length minus the EOC for the indefinite
+     * transaction message length
+     */
+    next_tvb_len -= g_tcap_ends_def_len ? 0 : TC_EOC_LEN;
+
+    dissect_tcap_next_tvb(asn1, next_tvb_len, subtree);
+
+    if (!def_len)
+    {
+	dissect_tcap_eoc(asn1, subtree);
+    }
+
+    proto_item_set_len(cmp_item, asn1->offset - cmp_start);
+
+    return TC_DS_OK;
+}
+
+/* dissect dialog portion */
+static int
+dissect_tcap_dlg_protocol_version(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    gboolean def_len;
+
+#define TC_DLG_PROTO_VER_TAG 0x80
+    if (check_tcap_tag(asn1, TC_DLG_PROTO_VER_TAG))
+    {
+	saved_offset = asn1->offset;
+	ret = asn1_id_decode1(asn1, &tag);
+	proto_tree_add_uint_format(tcap_tree, hf_tcap_tag, asn1->tvb,
+	    saved_offset, asn1->offset - saved_offset, tag,
+	    "Protocol Version Tag: 0x%x", tag);
+
+	dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+	saved_offset = asn1->offset;
+	ti =
+	    proto_tree_add_bytes(tcap_tree, hf_tcap_bytes, asn1->tvb, saved_offset, len,
+		(guchar*)(tvb_get_ptr(asn1->tvb, saved_offset, len)));
+	asn1->offset += len;
+    }
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_dlg_application_context_name(ASN1_SCK *asn1, proto_tree *tcap_tree)
+{
+    guint saved_offset = 0;
+    guint name_len, len, len2;
+    guint tag;
+    subid_t *oid;
+    int ret;
+    gboolean def_len;
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+    proto_tree_add_uint_format(tcap_tree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
+			    "Application Context Name Tag: 0x%x", tag);
+
+    dissect_tcap_len(asn1, tcap_tree, &def_len, &name_len);
+
+    saved_offset = asn1->offset;
+    ret = asn1_oid_decode (asn1, &oid, &len, &len2);
+    proto_tree_add_bytes(tcap_tree, hf_tcap_app_con_name, asn1->tvb, saved_offset, len2, tvb_get_ptr(asn1->tvb, saved_offset, len2));
+    if (ret == ASN1_ERR_NOERROR) g_free(oid);
+
+    if (!def_len)
+    {
+	/* for Application Context Name Tag */
+	dissect_tcap_eoc(asn1, tcap_tree);
+    }
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_dlg_result(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint tag, rtag_len, itag_len;
+    guint saved_offset = 0;
+    gint32 value;
+    gchar *str;
+    gboolean def_len;
+    gboolean rtag_def_len;
+
+    tag = -1;
+    dissect_tcap_tag(asn1, tree, &tag, "Result Tag");
+
+    dissect_tcap_len(asn1, tree, &rtag_def_len, &rtag_len);
+
+    tag = -1;
+    dissect_tcap_tag(asn1, tree, &tag, "Integer Tag");
+
+    dissect_tcap_len(asn1, tree, &def_len, &itag_len);
+
+    saved_offset = asn1->offset;
+    asn1_int32_value_decode(asn1, itag_len, &value);
+
+    switch (value)
+    {
+    case 0x00: str = "Accepted"; break;
+    case 0x01: str = "Reject-permanent"; break;
+    default: str = "Unknown value"; break;
+    }
+
+    proto_tree_add_int_format(tree, hf_tcap_int, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+	value, "%s %d", str, value);
+
+    if (!rtag_def_len)
+    {
+	/* for Result Tag */
+	dissect_tcap_eoc(asn1, tree);
+    }
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_dlg_result_src_diag(ASN1_SCK *asn1, proto_tree *tree)
+{
+    guint saved_offset = 0;
+    guint len, tag;
+    gint32 value;
+    gboolean user;
+    gchar *str;
+    gboolean def_len;
+    gboolean serv_def_len;
+    gboolean diag_def_len;
+
+    tag = -1;
+    dissect_tcap_tag(asn1, tree, &tag, "Result Source Diagnostic Tag");
+
+    dissect_tcap_len(asn1, tree, &diag_def_len, &len);
+
+#define TC_DIAG_SERV_USER_TAG 0xa1
+#define TC_DIAG_SERV_PROV_TAG 0xa2
+    if (check_tcap_tag(asn1, TC_DIAG_SERV_USER_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Dialogue Service User Tag");
+	user = TRUE;
+    }
+    else if (check_tcap_tag(asn1, TC_DIAG_SERV_PROV_TAG))
+    {
+	tag = -1;
+	dissect_tcap_tag(asn1, tree, &tag, "Dialogue Service Provider Tag");
+	user = FALSE;
+    }
+    else
+    {
+	proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, asn1->offset, len,
+	    "Unknown Result Source Diagnostic");
+
+	asn1->offset += len;
+	return(TC_DS_OK);
+    }
+
+    dissect_tcap_len(asn1, tree, &serv_def_len, &len);
+
+    tag = -1;
+    dissect_tcap_tag(asn1, tree, &tag, "Integer Tag");
+
+    dissect_tcap_len(asn1, tree, &def_len, &len);
+
+    saved_offset = asn1->offset;
+    asn1_int32_value_decode(asn1, len, &value);
+
+    if (user)
+    {
+	switch (value)
+	{
+	case 0x00: str = "Null"; break;
+	case 0x01: str = "No reason given"; break;
+	case 0x02: str = "Application Context Name not supplied"; break;
+	default: str = "Unknown value"; break;
+	}
+    }
+    else
+    {
+	switch (value)
+	{
+	case 0x00: str = "Null"; break;
+	case 0x01: str = "No reason given"; break;
+	case 0x02: str = "No common dialogue portion"; break;
+	default: str = "Unknown value"; break;
+	}
+    }
+
+    proto_tree_add_int_format(tree, hf_tcap_int, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+	value, "%s %d", str, value);
+
+    if (!serv_def_len)
+    {
+	/* for Dialogue Service User/Provider Tag */
+	dissect_tcap_eoc(asn1, tree);
+    }
+
+    if (!diag_def_len)
+    {
+	/* for Result Source Diagnostic Tag */
+	dissect_tcap_eoc(asn1, tree);
+    }
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_dlg_user_info(ASN1_SCK *asn1, proto_tree *tree)
+{
+	guint tag, len;
+	guint saved_offset = 0;
+	gboolean def_len;
+	gboolean user_info_def_len;
+
+#define TC_USR_INFO_TAG 0xbe
+	if (check_tcap_tag(asn1, TC_USR_INFO_TAG))
+	{
+	    tag = -1;
+	    dissect_tcap_tag(asn1, tree, &tag, "User Info Tag");
+	    dissect_tcap_len(asn1, tree, &user_info_def_len, &len);
+
+#define TC_EXT_TAG 0x28
+	    if (check_tcap_tag(asn1, TC_EXT_TAG))
+	    {
+		saved_offset = asn1->offset;
+		asn1_id_decode1(asn1, &tag);
+		proto_tree_add_uint_format(tree, hf_tcap_length, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+		    tag, "External Tag: 0x%x", tag);
+
+		dissect_tcap_len(asn1, tree, &def_len, &len);
+	    }
+
+	    proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, asn1->offset, len, "Parameter Data");
+	    asn1->offset += len;
+
+	    if (!user_info_def_len)
+	    {
+		/* for User Information Tag */
+		dissect_tcap_eoc(asn1, tree);
+	    }
+	}
+
+	return TC_DS_OK;
+}
+
+static int
+dissect_tcap_dlg_req(ASN1_SCK *asn1, proto_tree *tcap_tree)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *req_item;
+    guint req_start = asn1->offset;
+    gboolean def_len;
+
+    /* dissect dialog portion */
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+    req_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Dialogue Request");
+    subtree = proto_item_add_subtree(req_item, ett_dlg_req);
+    proto_tree_add_uint(subtree, hf_tcap_dlg_type, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag);
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+    dissect_tcap_dlg_protocol_version(asn1, subtree, NULL);
+
+    dissect_tcap_dlg_application_context_name(asn1, subtree);
+
+    dissect_tcap_dlg_user_info(asn1, subtree);
+
+    /* decode end of sequence */
+
+    if (!def_len)
+    {
+	/* for Dialogue Request Tag */
+	dissect_tcap_eoc(asn1, subtree);
+    }
+
+    proto_item_set_len(req_item, asn1->offset - req_start);
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_dlg_rsp(ASN1_SCK *asn1, proto_tree *tcap_tree)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *req_item;
+    guint req_start = asn1->offset;
+    gboolean def_len;
+
+    /* dissect dialog portion */
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+    req_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Dialogue Response");
+    subtree = proto_item_add_subtree(req_item, ett_dlg_rsp);
+    proto_tree_add_uint(subtree, hf_tcap_dlg_type, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag);
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+    dissect_tcap_dlg_protocol_version(asn1, subtree, NULL);
+
+    dissect_tcap_dlg_application_context_name(asn1, subtree);
+
+    /* result */
+    dissect_tcap_dlg_result(asn1, subtree);
+
+    /* result source diag */
+    dissect_tcap_dlg_result_src_diag(asn1, subtree);
+
+    dissect_tcap_dlg_user_info(asn1, subtree);
+
+    if (!def_len)
+    {
+	/* for Dialogue Response Tag */
+	dissect_tcap_eoc(asn1, subtree);
+    }
+
+    proto_item_set_len(req_item, asn1->offset - req_start);
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_dlg_abrt(ASN1_SCK *asn1, proto_tree *tree)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *req_item;
+    gint32 value;
+    gchar *str;
+    gboolean def_len, abort_def_len;
+
+    /* dissect dialog pabort portion */
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+    req_item = proto_tree_add_none_format(tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Dialogue Abort");
+    subtree = proto_item_add_subtree(req_item, ett_dlg_abrt );
+    proto_tree_add_uint(subtree, hf_tcap_dlg_type, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag);
+
+    dissect_tcap_len(asn1, subtree, &abort_def_len, &len);
+
+    tag = -1;
+    dissect_tcap_tag(asn1, subtree, &tag, "Abort Source Tag");
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+    saved_offset = asn1->offset;
+    asn1_int32_value_decode(asn1, len, &value);
+
+    switch (value)
+    {
+    case 0x00: str = "Dialogue Service User"; break;
+    case 0x01: str = "Dialogue Service Provider"; break;
+    default: str = "Unknown value"; break;
+    }
+
+    proto_tree_add_int_format(subtree, hf_tcap_int, asn1->tvb, saved_offset, asn1->offset - saved_offset,
+	value, "Abort Source: %s %d", str, value);
+
+    dissect_tcap_dlg_user_info(asn1, subtree);
+
+    if (!abort_def_len)
+    {
+	/* for Dialogue Abort Tag */
+	dissect_tcap_eoc(asn1, subtree);
+    }
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_tcap_dialog_portion(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *dlg_item;
+    guint dlg_start = asn1->offset;
+    gboolean def_len, ext_tag_def_len, portion_def_len;
+
+    if (tvb_length_remaining(asn1->tvb, asn1->offset) <= 0)
+    {
+	return TC_DS_FAIL;
+    }
+
+    /* dissect dialog portion */
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    /* error handling */
+    if (ST_ITU_DLG_TAG != tag)
+    {
+	    asn1->offset = saved_offset;
+	    return TC_DS_FAIL;
+    }
+
+    dlg_item =
+	proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb,
+	    saved_offset, -1, "Dialogue Portion");
+
+    subtree = proto_item_add_subtree(dlg_item, ett_dlg_portion);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+	saved_offset, asn1->offset - saved_offset, tag, "Dialogue Portion Tag");
+
+    dissect_tcap_len(asn1, subtree, &portion_def_len, &len);
+
+    if (portion_def_len)
+    {
+	proto_item_set_len(dlg_item, len);
+    }
+
+    ext_tag_def_len = FALSE;
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+#define TC_EXT_TAG 0x28
+    if (TC_EXT_TAG != tag)
+    {
+	asn1->offset = saved_offset;
+    }
+    else
+    {
+	proto_tree_add_uint_format(subtree, hf_tcap_length, asn1->tvb,
+	    saved_offset, asn1->offset - saved_offset, tag,
+	    "External Tag: 0x%x", tag);
+
+	dissect_tcap_len(asn1, subtree, &ext_tag_def_len, &len);
+    }
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+#define TC_OID_TAG 0x06
+    if (TC_OID_TAG != tag)
+    {
+	asn1->offset = saved_offset;
+    }
+    else
+    {
+	proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+	    saved_offset, asn1->offset - saved_offset, tag,
+	    "Object Identifier Tag");
+
+	dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+	saved_offset = asn1->offset;
+	ti =
+	    proto_tree_add_bytes(subtree, hf_tcap_bytes, asn1->tvb, saved_offset, len,
+		(guchar*)(tvb_get_ptr(asn1->tvb, saved_offset, len)));
+
+	asn1->offset += len;
+    }
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
+	saved_offset, asn1->offset - saved_offset, tag,
+	"Single-ASN.1-type Tag");
+
+    dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+    proto_item_set_len(dlg_item, asn1->offset - dlg_start);
+
+    /* dialogue PDU */
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+    asn1->offset = saved_offset;
+
+    switch(tag)
+    {
+    case TC_DLG_REQ:
+	dissect_tcap_dlg_req(asn1, subtree);
+	break;
+    case TC_DLG_RSP:
+	dissect_tcap_dlg_rsp(asn1, subtree);
+	break;
+    case TC_DLG_ABRT:
+	dissect_tcap_dlg_abrt(asn1, subtree);
+	break;
+    default:
+	break;
+    }
+
+    /* decode end of sequence */
+
+    if (!def_len)
+    {
+	dissect_tcap_eoc(asn1, subtree);
+    }
+
+    if (!ext_tag_def_len)
+    {
+	dissect_tcap_eoc(asn1, subtree);
+    }
+
+    if (!portion_def_len)
+    {
+	dissect_tcap_eoc(asn1, subtree);
+    }
+
+    proto_item_set_len(dlg_item, asn1->offset - dlg_start);
+
+    return TC_DS_OK;
+}
+
+/* dissect reason */
+static int
+dissect_tcap_abort_reason(ASN1_SCK *asn1, proto_tree *tcap_tree)
+{
+    guint saved_offset = 0;
+    guint tag, len;
+    proto_tree *subtree;
+    proto_item *item;
+    gint32 value;
+    gchar *str = NULL;
+    gboolean def_len;
+
+#define TC_PABRT_REASON_TAG 0x4a
+    tag = TC_PABRT_REASON_TAG;
+    if (check_tcap_tag(asn1, tag))
+    {
+	saved_offset = asn1->offset;
+	item =
+	    proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb,
+		saved_offset, -1, "PAbort Cause");
+
+	subtree = proto_item_add_subtree(item, ett_reason);
+
+	tag = -1;
+	dissect_tcap_tag(asn1, subtree, &tag, "PAbort Cause Tag");
+	dissect_tcap_len(asn1, subtree, &def_len, &len);
+
+	proto_item_set_len(item, (asn1->offset - saved_offset) + len);
+
+	saved_offset = asn1->offset;
+	asn1_int32_value_decode(asn1, len, &value);
+
+	switch (value)
+	{
+	case 0x00: str = "Unrecognized Message Type"; break;
+	case 0x01: str = "Unrecognized Transaction ID"; break;
+	case 0x02: str = "Badly Formatted Transaction Portion"; break;
+	case 0x03: str = "Incorrect Transaction Portion"; break;
+	case 0x04: str = "Resource Limitation"; break;
+	default:
+	    str = "Undefined";
+	    break;
+	}
+
+	proto_tree_add_none_format(subtree, hf_tcap_none, asn1->tvb,
+	    saved_offset, asn1->offset - saved_offset, "Cause Value %s (%d)",
+	    str, value);
+    }
+
+    return TC_DS_OK;
+}
+
+/* dissect each type of message */
+
+static void
+dissect_tcap_unidirectional(ASN1_SCK *asn1, proto_tree *tcap_tree)
+{
+
+    dissect_tcap_dialog_portion(asn1, tcap_tree, NULL);
+
+    dissect_tcap_components(asn1, tcap_tree);
+}
+
+static void
+dissect_tcap_begin(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+
+    dissect_tcap_tid(asn1, tcap_tree, ti, ST_TID_SOURCE);
+
+    dissect_tcap_dialog_portion(asn1, tcap_tree, NULL);
+
+    dissect_tcap_components(asn1, tcap_tree);
+}
+
+static void
+dissect_tcap_continue(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+
+    dissect_tcap_tid(asn1, tcap_tree, ti, ST_TID_SOURCE);
+
+    dissect_tcap_tid(asn1, tcap_tree, ti, ST_TID_DEST);
+
+    dissect_tcap_dialog_portion(asn1, tcap_tree, NULL);
+
+    dissect_tcap_components(asn1, tcap_tree);
+
+}
+
+static void
+dissect_tcap_end(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+
+    dissect_tcap_tid(asn1, tcap_tree, ti, ST_TID_DEST);
+
+    dissect_tcap_dialog_portion(asn1, tcap_tree, NULL);
+
+    dissect_tcap_components(asn1, tcap_tree);
+}
+
+static void
+dissect_tcap_abort(ASN1_SCK *asn1, proto_tree *tree, proto_item *ti)
+{
+
+    dissect_tcap_tid(asn1, tree, ti, ST_TID_DEST);
+
+    dissect_tcap_abort_reason(asn1, tree);
+
+    dissect_tcap_dialog_portion(asn1, tree, NULL);
+}
+
+/* Samuel */
+static void
+dissect_tcap_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tcap_tree)
+{
+    ASN1_SCK asn1;
+    guint msg_type_tag;
+    proto_item *ti;
+    guint offset = 0;
+    guint saved_offset = 0;
+    guint len;
+    gchar *str = NULL;
+
+    asn1_open(&asn1, tvb, offset);
+
+    asn1_id_decode1(&asn1, &msg_type_tag);
+
+    str = match_strval(msg_type_tag, msg_type_strings);
+
+    if (str == NULL)
+    {
+	proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1.tvb, offset, -1, "Unknown message type, ignoring");
+	return;
+    }
+
+    if (check_col(pinfo->cinfo, COL_INFO))
+    {
+	col_set_str(pinfo->cinfo, COL_INFO, str);
+	col_append_str(pinfo->cinfo, COL_INFO, " ");
+    }
+
+    proto_tree_add_uint_hidden(tcap_tree, hf_tcap_ssn, asn1.tvb, offset,
+			     0, pinfo->match_port); /* len -1 is unacceptable */
+
+    ti = proto_tree_add_uint(tcap_tree, hf_tcap_message_type, asn1.tvb, offset, asn1.offset - saved_offset,
+	    msg_type_tag);
+
+    dissect_tcap_len(&asn1, tcap_tree, &g_tcap_ends_def_len, &len);
+
+    switch(msg_type_tag)
+    {
+    case ST_MSG_TYP_UNI:
+	dissect_tcap_unidirectional(&asn1, tcap_tree);
+	break;
+    case ST_MSG_TYP_BGN:
+	dissect_tcap_begin(&asn1, tcap_tree, ti);
+	break;
+    case ST_MSG_TYP_CNT:
+	dissect_tcap_continue(&asn1, tcap_tree, ti);
+	break;
+    case ST_MSG_TYP_END:
+	dissect_tcap_end(&asn1, tcap_tree, ti);
+	break;
+    case ST_MSG_TYP_PABT:
+	dissect_tcap_abort(&asn1, tcap_tree, ti);
+	break;
+    default:
+	proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1.tvb, offset, -1,
+	    "Message type not handled, ignoring");
+	break;
+    }
+
+    if (!g_tcap_ends_def_len)
+    {
+	dissect_tcap_eoc(&asn1, tcap_tree);
+    }
+
+    asn1_close(&asn1, &saved_offset);
+}
+
+static int
+dissect_ansi_tcap_components(ASN1_SCK *asn1, proto_tree *tcap_tree)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *cmp_item;
+    guint cmp_start = asn1->offset;
+    gboolean def_len;
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    if (ST_ANSI_CMP_TAG != tag)
+    {
+	    asn1->offset = saved_offset;
+	    return TC_DS_FAIL;
+    }
+
+    cmp_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Components Portion");
+
+    subtree = proto_item_add_subtree(cmp_item, ett_cmp_portion);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
+	"Component Sequence Identifier");
+
+    dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+
+    /* call next dissector */
+
+    dissect_ansi_tcap_next_tvb(asn1, len, subtree);
+
+    proto_item_set_len(cmp_item, asn1->offset - cmp_start);
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_ansi_tcap_unidirectional(ASN1_SCK *asn1, proto_tree *tcap_tree)
+{
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *trans_item;
+    guint trans_start = asn1->offset;
+    gboolean def_len;
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    if (ST_ANSI_TID_TAG != tag)
+    {
+	asn1->offset = saved_offset;
+	return TC_DS_FAIL;
+    }
+
+    trans_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Transaction Portion");
+
+    dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+
+    if (len != 0)
+    {
+	return TC_DS_FAIL;
+    }
+
+    proto_item_set_len(trans_item, asn1->offset - trans_start);
+
+    dissect_ansi_tcap_components(asn1, tcap_tree);
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_ansi_tcap_qwp_qwop(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *trans_item;
+    guint trans_start = asn1->offset;
+    guchar *poctets;
+    guint32 val;
+    gboolean def_len;
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    if (ST_ANSI_TID_TAG != tag)
+    {
+	asn1->offset = saved_offset;
+	return TC_DS_FAIL;
+    }
+
+    trans_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Transaction Portion");
+    subtree = proto_item_add_subtree(trans_item, ett_dlg_portion);
+
+    dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
+	"Originating Transaction ID Identifier");
+
+    if (len != 4)
+    {
+	return TC_DS_FAIL;
+    }
+
+    saved_offset = asn1->offset;
+    ret = asn1_string_value_decode(asn1, len, &poctets);
+    val = 0;
+    memcpy(&val, poctets, len);
+    ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
+    g_free(poctets);
+
+    if (check_col(g_pinfo->cinfo, COL_INFO))
+	col_append_fstr(g_pinfo->cinfo, COL_INFO, "otid(%x) ", val);
+
+    proto_item_set_len(trans_item, asn1->offset - trans_start);
+
+    dissect_ansi_tcap_components(asn1, tcap_tree);
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_ansi_tcap_abort(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *trans_item;
+    guint trans_start = asn1->offset;
+    guchar *poctets;
+    guint32 val;
+    gboolean def_len;
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    if (ST_ANSI_TID_TAG != tag)
+    {
+	asn1->offset = saved_offset;
+	return TC_DS_FAIL;
+    }
+
+    trans_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Transaction Portion");
+    subtree = proto_item_add_subtree(trans_item, ett_dlg_portion);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
+	"Responding Transaction ID Identifier");
+
+    dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+
+    if (len != 4)
+    {
+	return TC_DS_FAIL;
+    }
+
+    saved_offset = asn1->offset;
+    ret = asn1_string_value_decode(asn1, len, &poctets);
+    val = 0;
+    memcpy(&val, poctets, len);
+    ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
+    g_free(poctets);
+
+    if (check_col(g_pinfo->cinfo, COL_INFO))
+	col_append_fstr(g_pinfo->cinfo, COL_INFO, "rtid(%x) ", val);
+
+    proto_item_set_len(trans_item, asn1->offset - trans_start);
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+#define ANSI_TC_PABRT_CAUSE_TAG 0xd7
+    if (tag == ANSI_TC_PABRT_CAUSE_TAG)
+    {
+	trans_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "P-Abort Portion");
+/*
+	subtree = proto_item_add_subtree(trans_item, ett_dlg_abrt);
+
+	proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
+	    "Responding Transaction ID Identifier");
+*/
+
+	dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+	dissect_tcap_integer(asn1, tcap_tree, len, "P-Abort Cause:");
+    }
+#define ANSI_TC_UABRT_INFO_TAG 0xd8
+    else if (tag == ANSI_TC_UABRT_INFO_TAG)
+    {
+	trans_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "U-Abort Portion");
+
+	dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+	if (len > 0)
+	{
+	    dissect_tcap_integer(asn1, tcap_tree, len, "User Abort Information:");
+	}
+    }
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_ansi_tcap_rsp(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *trans_item;
+    guint trans_start = asn1->offset;
+    guchar *poctets;
+    guint32 val;
+    gboolean def_len;
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    if (ST_ANSI_TID_TAG != tag)
+    {
+	asn1->offset = saved_offset;
+	return TC_DS_FAIL;
+    }
+
+    trans_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Transaction Portion");
+    subtree = proto_item_add_subtree(trans_item, ett_dlg_portion);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
+	"Responding Transaction ID Identifier");
+
+    dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+
+    if (len != 4)
+    {
+	return TC_DS_FAIL;
+    }
+
+    saved_offset = asn1->offset;
+    ret = asn1_string_value_decode(asn1, len, &poctets);
+    val = 0;
+    memcpy(&val, poctets, len);
+    ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
+    g_free(poctets);
+
+    if (check_col(g_pinfo->cinfo, COL_INFO))
+	col_append_fstr(g_pinfo->cinfo, COL_INFO, "rtid(%x) ", val);
+
+    proto_item_set_len(trans_item, asn1->offset - trans_start);
+
+    dissect_ansi_tcap_components(asn1, tcap_tree);
+
+    return TC_DS_OK;
+}
+
+static int
+dissect_ansi_tcap_cwp_cwop(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
+{
+    proto_tree *subtree;
+    guint saved_offset = 0;
+    guint len;
+    guint tag;
+    int ret;
+    proto_item *trans_item;
+    guint trans_start = asn1->offset;
+    guchar *poctets;
+    guint32 val;
+    gboolean def_len;
+
+    saved_offset = asn1->offset;
+    ret = asn1_id_decode1(asn1, &tag);
+
+    if (ST_ANSI_TID_TAG != tag)
+    {
+	asn1->offset = saved_offset;
+	return TC_DS_FAIL;
+    }
+
+    trans_item = proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1->tvb, saved_offset, -1, "Transaction Portion");
+    subtree = proto_item_add_subtree(trans_item, ett_dlg_portion);
+
+    proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
+	"Transaction ID Identifier");
+
+    dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
+
+    if (len != 8)
+    {
+	return TC_DS_FAIL;
+    }
+
+    saved_offset = asn1->offset;
+    ret = asn1_string_value_decode(asn1, 4, &poctets);
+    val = 0;
+    memcpy(&val, poctets, 4);
+    ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
+    g_free(poctets);
+
+    if (check_col(g_pinfo->cinfo, COL_INFO))
+	col_append_fstr(g_pinfo->cinfo, COL_INFO, "otid(%x) ", val);
+
+    saved_offset = asn1->offset;
+    ret = asn1_string_value_decode(asn1, 4, &poctets);
+    val = 0;
+    memcpy(&val, poctets, 4);
+    ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
+    g_free(poctets);
+
+    if (check_col(g_pinfo->cinfo, COL_INFO))
+	col_append_fstr(g_pinfo->cinfo, COL_INFO, "rtid(%x) ", val);
+
+    proto_item_set_len(trans_item, asn1->offset - trans_start);
+
+    dissect_ansi_tcap_components(asn1, tcap_tree);
+
+    return TC_DS_OK;
+}
+
+static void
+dissect_ansi_tcap_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tcap_tree)
+{
+    ASN1_SCK asn1;
+    guint msg_type_tag;
+    proto_item *ti;
+    guint offset = 0;
+    guint saved_offset = 0;
+    guint len;
+    gchar *str = NULL;
+    gboolean def_len;
+
+    asn1_open(&asn1, tvb, offset);
+
+    asn1_id_decode1(&asn1, &msg_type_tag);
+
+    str = match_strval(msg_type_tag, ansi_msg_type_strings);
+
+    if (str == NULL)
+    {
+	proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1.tvb, offset, -1, "Unknown message type, ignoring");
+	return;
+    }
+
+    if (check_col(pinfo->cinfo, COL_INFO))
+    {
+	col_set_str(pinfo->cinfo, COL_INFO, str);
+	col_append_str(pinfo->cinfo, COL_INFO, " ");
+    }
+
+    proto_tree_add_uint_hidden(tcap_tree, hf_tcap_ssn, asn1.tvb, offset,
+			     0, pinfo->match_port); /* len -1 is unacceptable */
+
+    ti = proto_tree_add_uint(tcap_tree, hf_ansi_tcap_message_type, asn1.tvb, offset, asn1.offset - saved_offset,
+	    msg_type_tag);
+
+    dissect_tcap_len(&asn1, tcap_tree, &def_len, &len);
+
+    switch(msg_type_tag)
+    {
+    case ANSI_ST_MSG_TYP_UNI:
+	    dissect_ansi_tcap_unidirectional(&asn1, tcap_tree);
+	    break;
+    case ANSI_ST_MSG_TYP_QWP:
+	    dissect_ansi_tcap_qwp_qwop(&asn1, tcap_tree, ti);
+	    break;
+    case ANSI_ST_MSG_TYP_QWOP:
+	    dissect_ansi_tcap_qwp_qwop(&asn1, tcap_tree, ti);
+	    break;
+    case ANSI_ST_MSG_TYP_RSP:
+	    dissect_ansi_tcap_rsp(&asn1, tcap_tree, ti);
+	    break;
+    case ANSI_ST_MSG_TYP_CWP:
+	    dissect_ansi_tcap_cwp_cwop(&asn1, tcap_tree, ti);
+	    break;
+    case ANSI_ST_MSG_TYP_CWOP:
+	    dissect_ansi_tcap_cwp_cwop(&asn1, tcap_tree, ti);
+	    break;
+    case ANSI_ST_MSG_TYP_PABT:
+	    dissect_ansi_tcap_abort(&asn1, tcap_tree, ti);
+	    break;
+    default:
+	    proto_tree_add_none_format(tcap_tree, hf_tcap_none, asn1.tvb, offset, -1,
+		"Message type not handled, ignoring");
+	    break;
+    }
+
+    asn1_close(&asn1, &saved_offset);
+}
+
+/* Code to actually dissect the packets */
+static void
+dissect_tcap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+    proto_item *ti;
+    proto_tree *tcap_tree;
+
+    g_pinfo = pinfo;
+
+    if (check_col(pinfo->cinfo, COL_PROTOCOL))
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "TCAP");
+
+    /* In the interest of speed, if "tree" is NULL, don't do any
+     * work not necessary to generate protocol tree items.
+     */
+    if (tree)
+    {
+	ti = proto_tree_add_item(tree, proto_tcap, tvb, 0, -1, FALSE);
+	tcap_tree = proto_item_add_subtree(ti, ett_tcap);
+	g_tcap_tree = tree;
+
+	if (tcap_standard == ITU_TCAP_STANDARD)
+	{
+	    dissect_tcap_message(tvb, pinfo, tcap_tree);
+	}
+	else
+	{
+	    dissect_ansi_tcap_message(tvb, pinfo, tcap_tree);
+	}
+    }
+}
+
+
+/* Register the protocol with Ethereal */
+
+/* this format is require because a script is used to build the C function
+   that calls all the protocol registration.
+*/
+void
+proto_register_tcap(void)
+{
+
+/* Setup list of header fields  See Section 1.6.1 for details*/
+	static hf_register_info hf[] = {
+		/*{ &hf_tcap_FIELDABBREV,
+			{ "FIELDNAME",           "PROTOABBREV.FIELDABBREV",
+			FIELDTYPE, FIELDBASE, FIELDCONVERT, BITMASK,
+			"FIELDDESCR" }
+		},*/
+		{ &hf_tcap_tag,
+			{ "Tag",           "tcap.msgtype",
+			FT_UINT8, BASE_HEX, NULL, 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_length,
+			{ "Length", "tcap.len",
+			FT_UINT8, BASE_HEX, NULL, 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_id,
+			{ "Value", "tcap.id",
+			FT_UINT8, BASE_HEX, NULL, 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_message_type,
+			{ "Message Type", "tcap.msgtype",
+			FT_UINT8, BASE_HEX, VALS(msg_type_strings), 0,
+			"", HFILL }
+		},
+		{ &hf_ansi_tcap_message_type,
+			{ "Message Type", "tcap.msgtype",
+			FT_UINT8, BASE_HEX, VALS(ansi_msg_type_strings), 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_none,
+			{ "Sub tree", "tcap.none",
+			FT_NONE, 0, 0, 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_tid,
+			{ "Transaction Id", "tcap.tid",
+			FT_UINT32, BASE_DEC, VALS(tid_strings), 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_ssn,
+			{ "Called or Calling SubSystem Number", "tcap.ssn",
+			FT_UINT8, BASE_DEC, 0x0, 0x0,
+			"", HFILL }
+		},
+		{ &hf_tcap_cmp_type,
+			{ "Component Type", "tcap.cmptype",
+			FT_UINT8, BASE_HEX, VALS(cmp_type_strings), 0,
+			"", HFILL }
+		},
+		{ &hf_ansi_tcap_cmp_type,
+			{ "Component Type", "tcap.cmptype",
+			FT_UINT8, BASE_HEX, VALS(ansi_cmp_type_strings), 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_dlg_type,
+			{ "Dialogue Type", "tcap.dlgtype",
+			FT_UINT8, BASE_HEX, VALS(dlg_type_strings), 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_app_con_name,
+			{ "Application Context Name", "tcap.dlg.appconname",
+			FT_BYTES, BASE_HEX, 0, 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_bytes,
+			{ "Binary Data", "tcap.data",
+			FT_BYTES, BASE_HEX, 0, 0,
+			"", HFILL }
+		},
+		{ &hf_tcap_int,
+			{ "Integer Data", "tcap.data",
+			FT_INT32, BASE_DEC, 0, 0,
+			"", HFILL }
+		},
+	};
+
+/* Setup protocol subtree array */
+	static gint *ett[] = {
+		&ett_tcap,
+		&ett_otid,
+		&ett_dtid,
+		&ett_dlg_portion,
+		&ett_cmp_portion,
+		&ett_reason,
+		&ett_dlg_req,
+		&ett_dlg_rsp,
+		&ett_dlg_abrt,
+		&ett_component,
+		&ett_error,
+		&ett_problem,
+		&ett_params,
+		&ett_param,
+	};
+
+	static enum_val_t tcap_options[] = {
+	    { "ITU",  ITU_TCAP_STANDARD },
+	    { "ANSI", ANSI_TCAP_STANDARD },
+	    { NULL, 0 }
+	};
+
+	module_t *tcap_module;
+
+/* Register the protocol name and description */
+	proto_tcap = proto_register_protocol("Transaction Capabilities Application Part",
+	    "TCAP", "tcap");
+
+/* Required function calls to register the header fields and subtrees used */
+	proto_register_field_array(proto_tcap, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	tcap_module = prefs_register_protocol(proto_tcap, proto_reg_handoff_tcap);
+
+	prefs_register_enum_preference(tcap_module, "standard", "TCAP standard",
+				 "The SS7 standard used in TCAP packets",
+				 (gint *)&tcap_standard, tcap_options, FALSE);
+
+        prefs_register_bool_preference(tcap_module, "lock_info_col", "Lock Info column",
+	    "Always show TCAP in Info column",
+	    &lock_info_col);
+
+	/* we will fake a ssn subfield which has the same value obtained from sccp */
+	tcap_itu_ssn_dissector_table = register_dissector_table("tcap.itu_ssn", "ITU TCAP SSN", FT_UINT8, BASE_DEC);
+	tcap_ansi_ssn_dissector_table = register_dissector_table("tcap.ansi_ssn", "ANSI TCAP SSN", FT_UINT8, BASE_DEC);
+}
+
+
+/* If this dissector uses sub-dissector registration add a registration routine.
+   This format is required because a script is used to find these routines and
+   create the code that calls these routines.
+*/
+void
+proto_reg_handoff_tcap(void)
+{
+    static gboolean tcap_prefs_initialized = FALSE;
+    dissector_handle_t tcap_handle;
+
+    if (!tcap_prefs_initialized)
+    {
+	tcap_handle = create_dissector_handle(dissect_tcap,
+	    proto_tcap);
+
+	dissector_add("sccp.ssn", 5, tcap_handle); /* MAP*/
+	dissector_add("sccp.ssn", 6, tcap_handle); /* HLR*/
+	dissector_add("sccp.ssn", 7, tcap_handle); /* VLR */
+	dissector_add("sccp.ssn", 8, tcap_handle); /* MSC */
+	dissector_add("sccp.ssn", 9, tcap_handle); /* EIR */
+	dissector_add("sccp.ssn", 10, tcap_handle); /* EIR */
+	dissector_add("sccp.ssn", 11, tcap_handle); /* SMS/MC */
+	dissector_add("sccp.ssn", 12, tcap_handle); /* IS41 OTAF */
+
+	tcap_prefs_initialized = TRUE;
+    }
+
+    data_handle = find_dissector("data");
+}