path: root/epan/dissectors/packet-v5ua.c

/* packet-v5ua.c
 *
 * Extension of all V5.2-User Adaptation Layer dissection elements
 * References:
 * RFC 3807
 * RFC 4233
 * RFC 5133
 *
 * Copyright 2009
 *
 * ISKRATEL d.o.o.            |       4S d.o.o.
 * http://www.iskratel.si/    |       http://www.4es.si/
 * <info@iskratel.si>         |       <projects@4es.si>
 * Vladimir Smrekar <vladimir.smrekar@gmail.com>
 *
 * Routines for V5.2-User Adaptation Layer dissection
 *
 * Extension of ISDN Q.921-User Adaptation Layer dissection
 * Copyright 2002, Michael Tuexen <Michael.Tuexen[AT]siemens.com>
 *
 * Christoph Neusch <christoph.neusch@nortelnetworks.com>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/sctpppids.h>      /* include V5UA payload protocol ID */

#include <wsutil/str_util.h>
#include <wsutil/ws_roundup.h>

void proto_register_v5ua(void);
void proto_reg_handoff_v5ua(void);

static dissector_handle_t v5ua_handle;

static int paddingl;
static int dlci_efa = -1;

/* Initialize the protocol and registered fields */
static int proto_v5ua;

static dissector_handle_t q931_handle;
static dissector_handle_t v52_handle;

/* common msg-header */
static int hf_version;
static int hf_reserved;
static int hf_msg_class;
static int hf_msg_type;
/* static int hf_msg_type_id; */
static int hf_msg_length;
/* V5UA message header */
static int hf_link_id;
static int hf_chnl_id;
static int hf_adaptation_layer_id;
static int hf_text_if_id;
static int hf_scn_protocol_id;
static int hf_info_string;
static int hf_asp_identifier;
static int hf_dlci_zero_bit;
static int hf_dlci_spare_bit;
static int hf_dlci_sapi;
static int hf_dlci_one_bit;
static int hf_dlci_tei;
static int hf_efa;
/* static int hf_spare_efa; */
/* variable length parameter (msg) */
static int hf_parameter_tag;
static int hf_parameter_tag_draft;
static int hf_parameter_length;
static int hf_parameter_value;
static int hf_parameter_padding;

 /* parameter fields */
static int hf_link_status;
static int hf_sa_bit_id;
static int hf_sa_bit_value;
static int hf_diagnostic_info;
static int hf_if_range_start;
static int hf_if_range_end;
static int hf_heartbeat_data;
static int hf_traffic_mode_type;
static int hf_error_code;
static int hf_draft_error_code;
static int hf_status_type;
static int hf_status_id;
static int hf_error_reason;
static int hf_asp_reason;
static int hf_tei_status;
static int hf_tei_draft_status;
static int hf_release_reason;

/* Initialize the subtree pointers */
static int ett_v5ua;
static int ett_v5ua_common_header;
static int ett_v5ua_parameter;
static int ett_v5ua_layer3;

#define RFC             0x1
#define DRAFT           0x2
 /* Version of IUA */
static int iua_version = RFC;
/* Variables necessary for dissection of draft messages */
static int msg_class   = -1;
static int msg_type    = -1;
static int msg_length  = -1;
static int messageclassCopy = -1;
static int sa_bit_id = -1;
static int link_status_operational = -1;

/* Code to actually dissect the packets */

 /* define the parameters for the Tags: Tag-Type,Tag-Length,Tag-Value (Payload) */
#define PARAMETER_TAG_OFFSET    0
#define PARAMETER_TAG_LENGTH    2
#define PARAMETER_LENGTH_OFFSET (PARAMETER_TAG_OFFSET + PARAMETER_TAG_LENGTH)
#define PARAMETER_LENGTH_LENGTH 2
#define PARAMETER_VALUE_OFFSET  (PARAMETER_LENGTH_OFFSET + PARAMETER_LENGTH_LENGTH)
#define PARAMETER_HEADER_OFFSET PARAMETER_TAG_OFFSET
#define PARAMETER_HEADER_LENGTH (PARAMETER_TAG_LENGTH + PARAMETER_LENGTH_LENGTH)


/*----------------------V5UA Interface Identifier (int) (Draft,RFC)------------*/

 /* define parameter for the format of the integer formatted Interface Identifier */
#define INT_IF_ID_LINK_OFFSET PARAMETER_VALUE_OFFSET
#define INT_IF_ID_LINK_LENGTH 4
#define INT_IF_ID_CHNL_OFFSET INT_IF_ID_LINK_OFFSET
#define INT_IF_ID_CHNL_LENGTH 1
#define INT_INTERFACE_ID_LENGTH 4

static int linkIdentifier = -1;

static void
dissect_int_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   uint32_t identifier;
   uint16_t number_of_ids, id_number;
   int offset;

   number_of_ids= (tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH) / INT_INTERFACE_ID_LENGTH;

   offset = INT_IF_ID_LINK_OFFSET;
   proto_item_append_text(parameter_item, "(");
   for (id_number = 0; id_number < number_of_ids; id_number++) {
      proto_tree_add_item(parameter_tree, hf_link_id, parameter_tvb, offset, INT_IF_ID_LINK_LENGTH, ENC_BIG_ENDIAN);
      identifier = tvb_get_ntohl(parameter_tvb,offset)>>5;
      if (id_number < 1) {
         proto_item_append_text(parameter_item, "L:%d",identifier);
      } else {
         proto_item_append_text(parameter_item, " | L:%d",identifier);
      }
      linkIdentifier = identifier;

      proto_tree_add_item(parameter_tree, hf_chnl_id, parameter_tvb, offset+3, INT_IF_ID_CHNL_LENGTH, ENC_BIG_ENDIAN);
      identifier = tvb_get_uint8(parameter_tvb,offset+3)&0x1f;
      proto_item_append_text(parameter_item, " C:%d", identifier);
      offset += INT_INTERFACE_ID_LENGTH;
   }
   proto_item_append_text(parameter_item, ")");
}
/*----------------------V5UA Interface Identifier (int) (Draft,RFC)------------*/

/*----------------------Text Interface Identifier (RFC)------------------------*/

#define TEXT_IF_ID_LENGTH_OFFSET PARAMETER_LENGTH_OFFSET
#define TEXT_IF_ID_VALUE_OFFSET  PARAMETER_VALUE_OFFSET
#define TEXT_IF_ID_HEADER_LENGTH PARAMETER_HEADER_LENGTH

static void
dissect_text_interface_identifier_parameter(packet_info *pinfo, tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   uint16_t if_id_length;
   const uint8_t* str;

   if_id_length = tvb_get_ntohs(parameter_tvb, TEXT_IF_ID_LENGTH_OFFSET) - TEXT_IF_ID_HEADER_LENGTH;

   proto_tree_add_item_ret_string(parameter_tree, hf_text_if_id, parameter_tvb, TEXT_IF_ID_VALUE_OFFSET, if_id_length, ENC_ASCII, pinfo->pool, &str);
   proto_item_append_text(parameter_item, " (0x%s)", str);
}
/*----------------------Text Interface Identifier (RFC)------------------------*/

/*----------------------DLCI & Envelope Function Address------------------------*/


/* interpretation of EFA-values */
static const value_string efa_values[] = {
 { 8175, "ISDN Protocol" },
 { 8176, "PSTN Protocol" },
 { 8177, "CONTROL Protocol" },
 { 8178, "BCC Protocol" },
 { 8179, "PROT Protocol" },
 { 8180, "Link Control Protocol" },
 { 8191, "VALUE RESERVED" },
 { 0,    NULL } };

#define DLCI_LENGTH_OFFSET PARAMETER_LENGTH_OFFSET
#define DLCI_SAPI_OFFSET   PARAMETER_VALUE_OFFSET
#define DLCI_HEADER_LENGTH PARAMETER_HEADER_LENGTH

#define DLCI_SAPI_LENGTH   1
#define DLCI_TEI_LENGTH    1
#define EFA_LENGTH         2

static void
dissect_dlci_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item, packet_info *pinfo)
{
   uint16_t efa = 0, offset = 0;

   uint8_t sapi = -1;
   uint8_t tei = -1;


   if     (iua_version == RFC)   offset = DLCI_SAPI_OFFSET;
   else if(iua_version == DRAFT) offset = DLCI_HEADER_LENGTH + tvb_get_ntohs(parameter_tvb, DLCI_LENGTH_OFFSET);

   proto_tree_add_item(parameter_tree, hf_dlci_zero_bit,  parameter_tvb, offset,  DLCI_SAPI_LENGTH,  ENC_BIG_ENDIAN);
   proto_tree_add_item(parameter_tree, hf_dlci_spare_bit, parameter_tvb, offset,  DLCI_SAPI_LENGTH,  ENC_BIG_ENDIAN);
   proto_tree_add_item(parameter_tree, hf_dlci_sapi,      parameter_tvb, offset,  DLCI_SAPI_LENGTH,  ENC_BIG_ENDIAN);

   offset += DLCI_SAPI_LENGTH;
   proto_tree_add_item(parameter_tree, hf_dlci_one_bit,   parameter_tvb, offset,  DLCI_TEI_LENGTH,   ENC_BIG_ENDIAN);
   proto_tree_add_item(parameter_tree, hf_dlci_tei,       parameter_tvb, offset,  DLCI_TEI_LENGTH,   ENC_BIG_ENDIAN);

   sapi = tvb_get_ntohs(parameter_tvb, offset-DLCI_TEI_LENGTH-DLCI_SAPI_LENGTH)>>2;
   tei = tvb_get_ntohs(parameter_tvb, offset-DLCI_TEI_LENGTH)>>1;

   offset += DLCI_TEI_LENGTH;
   efa = tvb_get_ntohs(parameter_tvb, offset);
   dlci_efa = tvb_get_ntohs(parameter_tvb, offset);

   if (dlci_efa >= 0 && dlci_efa <= 8175) { col_append_fstr(pinfo->cinfo, COL_INFO, " | ISDN: %u", dlci_efa); }
   else if (dlci_efa == 8176) { col_append_str(pinfo->cinfo, COL_INFO, " | PSTN"); }
   else if (dlci_efa == 8177) { col_append_str(pinfo->cinfo, COL_INFO, " | Ctrl"); }
   else if (dlci_efa == 8178) { col_append_str(pinfo->cinfo, COL_INFO, " | BCC"); }
   else if (dlci_efa == 8179) { col_append_str(pinfo->cinfo, COL_INFO, " | ProtProt"); }
   else if (dlci_efa == 8180) { col_append_str(pinfo->cinfo, COL_INFO, " | LinkCtrl"); }

   if(efa <= 8175) {
      proto_tree_add_uint_format_value(parameter_tree, hf_efa,  parameter_tvb, offset, EFA_LENGTH, efa,
            "ISDN (%u)", efa);
      proto_item_append_text(parameter_item, " (SAPI:%u TEI:%u EFA:ISDN (%u))",sapi,tei,efa);
   }
   else if (efa <= 8180){
      proto_tree_add_uint_format_value(parameter_tree, hf_efa,  parameter_tvb, offset, EFA_LENGTH, efa,
            "%s (%u)", val_to_str_const(efa, efa_values, "unknown EFA"),tvb_get_ntohs(parameter_tvb, offset));
      proto_item_append_text(parameter_item, " (SAPI:%u TEI:%u EFA:%s (%u))",sapi,tei,val_to_str_const(efa, efa_values, "unknown EFA-value"),efa);
   }
   else {
      proto_tree_add_uint_format_value(parameter_tree, hf_efa,  parameter_tvb, offset, EFA_LENGTH, efa,
            "RESERVED (%u)", efa);
      proto_item_append_text(parameter_item, " (SAPI:%u TEI:%u EFA:RESERVED (%u))",sapi,tei,efa);
   }


}
/*----------------------DLCI & Envelope Function Address------------------------*/

/*----------------------Error Indication (Draft)-------------------------------*/

 /* define Error Code Parameter for Layer Management (MGMT) Messages */
#define MGMT_ERROR_INVALID_TEI_DRAFT                       0x00
#define MGMT_ERROR_INVALID_IFID_DRAFT                      0x01
#define MGMT_ERROR_UNDEFINIED_MSG_DRAFT                    0x02
#define MGMT_ERROR_VERSION_ERR_DRAFT                       0x03
#define MGMT_ERROR_INVALID_STID_DRAFT                      0x04
#define MGMT_ERROR_INVALID_SCNV_DRAFT                      0x05
#define MGMT_ERROR_INVALID_ALI_DRAFT                       0x06

static const value_string draft_error_code_values[] = {
  { MGMT_ERROR_INVALID_TEI_DRAFT,     "Invalid TEI" },
  { MGMT_ERROR_INVALID_IFID_DRAFT,    "Invalid interface ID" },
  { MGMT_ERROR_UNDEFINIED_MSG_DRAFT,  "An unexpected message was received" },
  { MGMT_ERROR_VERSION_ERR_DRAFT,     "The IUA layers are of different version" },
  { MGMT_ERROR_INVALID_STID_DRAFT,    "Invalid SCTP stream identifier" },
  { MGMT_ERROR_INVALID_SCNV_DRAFT,    "Invalid SCN version" },
  { MGMT_ERROR_INVALID_ALI_DRAFT,     "Invalid Adaptation Layer Identifier" },
  { 0,                                NULL } };

#define MGMT_ERROR_MSG_LENGTH_OFFSET PARAMETER_LENGTH_OFFSET
#define MGMT_ERROR_MSG_HEADER_LENGTH PARAMETER_HEADER_LENGTH

#define MGMT_ERROR_CODE_LENGTH 4

static void
dissect_draft_error_code_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
{
   uint16_t offset = MGMT_ERROR_MSG_HEADER_LENGTH + tvb_get_ntohs(parameter_tvb, MGMT_ERROR_MSG_LENGTH_OFFSET) + 4;
   proto_tree_add_item(parameter_tree, hf_draft_error_code, parameter_tvb, offset, MGMT_ERROR_CODE_LENGTH, ENC_BIG_ENDIAN);
   offset += MGMT_ERROR_CODE_LENGTH ;
   if( tvb_reported_length_remaining(parameter_tvb,offset) > 0 )
      proto_tree_add_item(parameter_tree, hf_info_string, parameter_tvb, offset, msg_length - offset,ENC_ASCII);
}
/*----------------------Error Indication (Draft)-------------------------------*/

/*----------------------Error Indication (RFC)---------------------------------*/

 /* define Error Code Parameter for Layer Management (MGMT) Messages */
#define MGMT_ERROR_INVALID_VERSION                     0x01
#define MGMT_ERROR_INVALID_IF_ID                       0x02
#define MGMT_ERROR_UNSUPPORTED_MSG_CLASS               0x03
#define MGMT_ERROR_UNSUPPORTED_MSG_TYPE                0x04
#define MGMT_ERROR_UNSUPPORTED_TRAFFIC_HANDLING_MODE   0x05
#define MGMT_ERROR_UNEXPECTED_MSG                      0x06
#define MGMT_ERROR_PROTOCOL_ERROR                      0x07
#define MGMT_ERROR_UNSUPPORTED_IF_ID_TYPE              0x08
#define MGMT_ERROR_INVALID_STREAM_ID                   0x09
#define MGMT_ERROR_UNASSIGNED_TEI                      0x0a
#define MGMT_ERROR_UNRECOGNIZED_SAPI                   0x0b
#define MGMT_ERROR_INVALID_TEI_SAPI_COMBINATION        0x0c

static const value_string error_code_values[] = {
  { MGMT_ERROR_INVALID_VERSION,                       "Invalid version" },
  { MGMT_ERROR_INVALID_IF_ID,                         "Invalid interface identifier" },
  { MGMT_ERROR_UNSUPPORTED_MSG_CLASS,                 "Unsupported message class" },
  { MGMT_ERROR_UNSUPPORTED_MSG_TYPE,                  "Unsupported message type" },
  { MGMT_ERROR_UNSUPPORTED_TRAFFIC_HANDLING_MODE,     "Unsupported traffic handling mode" },
  { MGMT_ERROR_UNEXPECTED_MSG,                        "Unexpected message" },
  { MGMT_ERROR_PROTOCOL_ERROR,                        "Protocol error" },
  { MGMT_ERROR_UNSUPPORTED_IF_ID_TYPE,                "Unsupported interface identifier type" },
  { MGMT_ERROR_INVALID_STREAM_ID,                     "Invalid stream identifier" },
  { MGMT_ERROR_UNASSIGNED_TEI,                        "Unassigned TEI" },
  { MGMT_ERROR_UNRECOGNIZED_SAPI,                     "Unrecognized SAPI" },
  { MGMT_ERROR_INVALID_TEI_SAPI_COMBINATION,          "Invalid TEI/SAPI combination" },
  { 0,                                                NULL } };

#define MGMT_ERROR_CODE_OFFSET PARAMETER_VALUE_OFFSET

static void
dissect_error_code_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   proto_tree_add_item(parameter_tree, hf_error_code, parameter_tvb, MGMT_ERROR_CODE_OFFSET, MGMT_ERROR_CODE_LENGTH, ENC_BIG_ENDIAN);
   proto_item_append_text(parameter_item, " (%s)",
         val_to_str_const(tvb_get_ntohl(parameter_tvb, MGMT_ERROR_CODE_OFFSET), error_code_values, "Unknown error code"));
}

static void
dissect_diagnostic_information_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   uint16_t diag_info_length;

   diag_info_length = tvb_get_ntohs(parameter_tvb, MGMT_ERROR_MSG_LENGTH_OFFSET) - MGMT_ERROR_MSG_HEADER_LENGTH;
   proto_tree_add_item(parameter_tree, hf_diagnostic_info, parameter_tvb, PARAMETER_VALUE_OFFSET, diag_info_length, ENC_NA);
   proto_item_append_text(parameter_item, " (%u byte%s)", diag_info_length, plurality(diag_info_length, "", "s"));
}
/*----------------------Error Indication (RFC)---------------------------------*/

/*----------------------Notify (RFC)-------------------------------------------*/

 /* define Status Type parameters for Notify (NTFY) Messages */
#define NTFY_STATUS_TYPE_AS_STATE_CHANGE  0x01
#define NTFY_STATUS_TYPE_OTHER            0x02

static const value_string status_type_values[] = {
   { NTFY_STATUS_TYPE_AS_STATE_CHANGE,        "Application server state change" },
   { NTFY_STATUS_TYPE_OTHER,                  "Other" },
   { 0,                                       NULL } };

 /* define Status Identification parameters for NTFY Messages (AS state change)*/
#define NTFY_STATUS_IDENT_AS_DOWN          0x01
#define NTFY_STATUS_IDENT_AS_INACTIVE      0x02
#define NTFY_STATUS_IDENT_AS_ACTIVE        0x03
#define NTFY_STATUS_IDENT_AS_PENDING       0x04
 /* define Status Identification parameters for NTFY Messages (Other)*/
#define NTFY_STATUS_INSUFFICIENT_ASP_RES_ACTIVE 0x01
#define NTFY_STATUS_ALTERNATE_ASP_ACTIVE        0x02

static const value_string status_type_id_values[] = {
   { NTFY_STATUS_TYPE_AS_STATE_CHANGE * 256 * 256 + NTFY_STATUS_IDENT_AS_DOWN,         "Application server down" },
   { NTFY_STATUS_TYPE_AS_STATE_CHANGE * 256 * 256 + NTFY_STATUS_IDENT_AS_INACTIVE,     "Application server inactive" },
   { NTFY_STATUS_TYPE_AS_STATE_CHANGE * 256 * 256 + NTFY_STATUS_IDENT_AS_ACTIVE,       "Application server active" },
   { NTFY_STATUS_TYPE_AS_STATE_CHANGE * 256 * 256 + NTFY_STATUS_IDENT_AS_PENDING,      "Application server pending" },
   { NTFY_STATUS_TYPE_OTHER * 256 * 256 + NTFY_STATUS_INSUFFICIENT_ASP_RES_ACTIVE,     "Insufficient ASP resources active in AS" },
   { NTFY_STATUS_TYPE_OTHER * 256 * 256 + NTFY_STATUS_ALTERNATE_ASP_ACTIVE,            "Alternate ASP active" },
   { 0,                                           NULL } };

#define NTFY_STATUS_TYPE_OFFSET  PARAMETER_VALUE_OFFSET
#define NTFY_STATUS_TYPE_LENGTH  2
#define NTFY_STATUS_IDENT_OFFSET (NTFY_STATUS_TYPE_OFFSET + NTFY_STATUS_TYPE_LENGTH)
#define NTFY_STATUS_IDENT_LENGTH 2

static void
dissect_status_type_identification_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   uint16_t status_type, status_id;

   status_type = tvb_get_ntohs(parameter_tvb, NTFY_STATUS_TYPE_OFFSET);
   status_id   = tvb_get_ntohs(parameter_tvb, NTFY_STATUS_IDENT_OFFSET);

   proto_tree_add_item(parameter_tree, hf_status_type, parameter_tvb, NTFY_STATUS_TYPE_OFFSET, NTFY_STATUS_TYPE_LENGTH, ENC_BIG_ENDIAN);
   proto_tree_add_uint_format_value(parameter_tree, hf_status_id,  parameter_tvb, NTFY_STATUS_IDENT_OFFSET, NTFY_STATUS_IDENT_LENGTH,
         status_id, "%u (%s)", status_id,
         val_to_str_const(status_type * 256 * 256 + status_id, status_type_id_values, "unknown"));

   proto_item_append_text(parameter_item, " (%s)",
         val_to_str_const(status_type * 256 * 256 + status_id, status_type_id_values, "Unknown status information"));
}
/*----------------------Notify (RFC)-------------------------------------------*/

/*----------------------TEI Status Indication,Confirm (RFC)--------------------*/

 /* define parameters for TEI Status (Indication,Confirm) Messages */
#define TEI_STATUS_ASSIGNED       0x0
#define TEI_STATUS_UNASSIGNED     0x1

static const value_string tei_status_values[] = {
   { TEI_STATUS_ASSIGNED,   "TEI is considered assigned by Q.921" },
   { TEI_STATUS_UNASSIGNED, "TEI is considered unassigned by Q.921" },
   { 0,                     NULL } };

#define TEI_STATUS_OFFSET PARAMETER_VALUE_OFFSET
#define TEI_STATUS_LENGTH 4

static void
dissect_tei_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   proto_tree_add_item(parameter_tree, hf_tei_status, parameter_tvb, TEI_STATUS_OFFSET, TEI_STATUS_LENGTH, ENC_BIG_ENDIAN);
   proto_item_append_text(parameter_item, " (%s)",
         val_to_str_const(tvb_get_ntohl(parameter_tvb, TEI_STATUS_OFFSET), tei_status_values, "Unknown TEI status"));
}
/*----------------------TEI Status (RFC)---------------------------------------*/

/*----------------------TEI Status Indication,Confirm (Draft)------------------*/
#define TEI_DRAFT_IN_SERVICE     0x0
#define TEI_DRAFT_OUT_OF_SERVICE 0x1

static const value_string tei_draft_status_values[] = {
   { TEI_DRAFT_IN_SERVICE,    "TEI is in service" },
   { TEI_DRAFT_OUT_OF_SERVICE,"TEI is out of service" },
   { 0,                       NULL } };

#define TEI_STATUS_LENGTH_OFFSET PARAMETER_LENGTH_OFFSET

static void
dissect_draft_tei_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   int offset;
   offset = tvb_get_ntohs(parameter_tvb, TEI_STATUS_LENGTH_OFFSET) + 8;
   if(tvb_reported_length_remaining(parameter_tvb, offset) > 0 ){
      proto_tree_add_item(parameter_tree, hf_tei_draft_status, parameter_tvb, offset, TEI_STATUS_LENGTH, ENC_BIG_ENDIAN);
      proto_item_append_text(parameter_item, " (%s)",
            val_to_str_const(tvb_get_ntohl(parameter_tvb, offset), tei_draft_status_values, "Unknown TEI Status"));
   }
}
/*----------------------TEI Status (Draft)-------------------------------------*/

/*----------------------ASP Up,Down,Active,Inactive (Draft)--------------------*/

static void
dissect_asp_msg_parameter(packet_info *pinfo, tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   const uint8_t* str;
   uint16_t adaptation_layer_id_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);

   proto_tree_add_item_ret_string(parameter_tree, hf_adaptation_layer_id, parameter_tvb, PARAMETER_VALUE_OFFSET, adaptation_layer_id_length, ENC_ASCII, pinfo->pool, &str);
   proto_item_append_text(parameter_item, " (%s)", str);
}

static void
dissect_scn_protocol_id_parameter(packet_info *pinfo, tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   const uint8_t* str;
   uint16_t id_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
   proto_tree_add_item_ret_string(parameter_tree, hf_scn_protocol_id, parameter_tvb, PARAMETER_VALUE_OFFSET, id_length, ENC_ASCII, pinfo->pool, &str);
   proto_item_append_text(parameter_item, " (%s)", str);
}

/*----------------------ASP (Draft)--------------------------------------------*/

/*----------------------ASP Down + Ack (RFC)--------------------------------*/
 /* define reason parameter for Application Server Process Maintenance (ASPM) Messages */
#define ASP_REASON_MGMT   1

static const value_string asp_reason_values[] = {
   { ASP_REASON_MGMT,      "Management inhibit" },
   { 0,                    NULL } };

#define ASP_REASON_OFFSET PARAMETER_VALUE_OFFSET
#define ASP_REASON_LENGTH 4

static void
dissect_asp_reason_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   proto_tree_add_item(parameter_tree, hf_asp_reason, parameter_tvb, ASP_REASON_OFFSET, ASP_REASON_LENGTH, ENC_BIG_ENDIAN);
   proto_item_append_text(parameter_item, " (%s)", val_to_str_const(tvb_get_ntohl(parameter_tvb, ASP_REASON_OFFSET), asp_reason_values, "Unknown ASP down reason"));
}


/*----------------------ASP (RFC)----------------------------------------------*/

/*----------------------Heartbeat Data + Ack (RFC)-----------------------------*/

#define HEARTBEAT_MSG_LENGTH_OFFSET PARAMETER_LENGTH_OFFSET
#define HEARTBEAT_DATA_OFFSET       PARAMETER_VALUE_OFFSET
#define HEARTBEAT_MSG_HEADER_LENGTH PARAMETER_HEADER_LENGTH

static void
dissect_heartbeat_data_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   uint16_t heartbeat_data_length;

   heartbeat_data_length = tvb_get_ntohs(parameter_tvb, HEARTBEAT_MSG_LENGTH_OFFSET) - HEARTBEAT_MSG_HEADER_LENGTH;
   proto_tree_add_item(parameter_tree, hf_heartbeat_data, parameter_tvb, HEARTBEAT_DATA_OFFSET, heartbeat_data_length, ENC_NA);
   proto_item_append_text(parameter_item, " (%u byte%s)", heartbeat_data_length, plurality(heartbeat_data_length, "", "s"));
}
/*----------------------Heartbeat Data (RFC)-----------------------------------*/


/*----------------------ASP Active,Inactive + Ack (RFC)------------------------*/
#define OVER_RIDE_TRAFFIC_MODE_TYPE  1
#define LOAD_SHARE_TRAFFIC_MODE_TYPE 2

static const value_string traffic_mode_type_values[] = {
   { OVER_RIDE_TRAFFIC_MODE_TYPE,      "Over-ride" },
   { LOAD_SHARE_TRAFFIC_MODE_TYPE,     "Load-share" },
   { 0,                    NULL } };

#define TRAFFIC_MODE_TYPE_LENGTH 4
#define TRAFFIC_MODE_TYPE_OFFSET PARAMETER_VALUE_OFFSET

static void
dissect_traffic_mode_type_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   proto_tree_add_item(parameter_tree, hf_traffic_mode_type, parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET, TRAFFIC_MODE_TYPE_LENGTH, ENC_BIG_ENDIAN);
   proto_item_append_text(parameter_item, " (%s)",
         val_to_str_const(tvb_get_ntohl(parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET), traffic_mode_type_values, "Unknown traffic mode type"));
}

#define INT_RANGE_START_OFFSET  PARAMETER_VALUE_OFFSET
#define INT_RANGE_LENGTH_OFFSET PARAMETER_LENGTH_OFFSET
#define INT_RANGE_HEADER_LENGTH PARAMETER_HEADER_LENGTH

#define IF_ID_START_OFFSET      0
#define IF_ID_START_LENGTH      4
#define IF_ID_END_OFFSET        (IF_ID_START_OFFSET + IF_ID_START_LENGTH)
#define IF_ID_END_LENGTH        4
#define IF_ID_INTERVAL_LENGTH   (IF_ID_START_LENGTH + IF_ID_END_LENGTH)


static void
dissect_integer_range_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   uint16_t number_of_ranges, range_number, offset;

   number_of_ranges = (tvb_get_ntohs(parameter_tvb, INT_RANGE_LENGTH_OFFSET) - INT_RANGE_HEADER_LENGTH) / IF_ID_INTERVAL_LENGTH;
   offset = INT_RANGE_START_OFFSET;
   for(range_number = 0; range_number < number_of_ranges; range_number++) {
      proto_tree_add_item(parameter_tree, hf_if_range_start, parameter_tvb, offset + IF_ID_START_OFFSET, IF_ID_START_LENGTH, ENC_BIG_ENDIAN);
      proto_tree_add_item(parameter_tree, hf_if_range_end,   parameter_tvb, offset + IF_ID_END_OFFSET,   IF_ID_END_LENGTH,   ENC_BIG_ENDIAN);
      offset += IF_ID_INTERVAL_LENGTH;
   };

   proto_item_append_text(parameter_item, " (%u range%s)", number_of_ranges, plurality(number_of_ranges, "", "s"));
}
/*----------------------ASP Active,Inactive (RFC)------------------------------*/

/*----------------------Data Request,Indication (Draft,RFC)--------------------*/

#define DISCRIMINATOR_OFFSET 0
#define DISCRIMINATOR_LENGTH 1
#define ADDRESS_OFFSET       1
#define ADDRESS_LENGTH       1
#define LOW_ADDRESS_OFFSET   2
#define LOW_ADDRESS_LENGTH   1

#define ALL_ADDRESS_OFFSET   1
#define ALL_ADDRESS_LENGTH   2

#define MSG_TYPE_OFFSET      3
#define MSG_TYPE_LENGTH      1
#define MSG_HEADER_LENGTH    4
#define INFO_ELEMENT_OFFSET  4
#define INFO_ELEMENT_LENGTH  1

static void
dissect_layer3_message(tvbuff_t *layer3_data_tvb, proto_tree *v5ua_tree,proto_item *parameter_item, packet_info *pinfo)
{
   uint16_t discriminator_offset;

   if(iua_version == DRAFT){
      discriminator_offset = DISCRIMINATOR_OFFSET;
   }
   else{
      discriminator_offset = DISCRIMINATOR_OFFSET + PARAMETER_HEADER_LENGTH;
   }

   if (tvb_get_uint8(layer3_data_tvb, discriminator_offset) == 0x48){
      uint16_t protocol_data_length;
      tvbuff_t *protocol_data_tvb;

      protocol_data_length = tvb_get_ntohs(layer3_data_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
      protocol_data_tvb    = tvb_new_subset_length(layer3_data_tvb, PARAMETER_VALUE_OFFSET, protocol_data_length);

      call_dissector(v52_handle, protocol_data_tvb, pinfo, v5ua_tree);

      proto_item_append_text(parameter_item, " (%u byte%s)", protocol_data_length, plurality(protocol_data_length, "", "s"));

   }
   else{
      uint16_t protocol_data_length;
      tvbuff_t *protocol_data_tvb;

      protocol_data_length = tvb_get_ntohs(layer3_data_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
      protocol_data_tvb    = tvb_new_subset_length(layer3_data_tvb, PARAMETER_VALUE_OFFSET, protocol_data_length);
      call_dissector(q931_handle, protocol_data_tvb, pinfo, v5ua_tree);

      proto_item_append_text(parameter_item, " (%u byte%s)", protocol_data_length, plurality(protocol_data_length, "", "s"));
   }
}

/*----------------------Data Request,Indication (Draft,RFC)------------------------*/

/*----------------------Establish Request,Confirm,Indication (Draft,RFC)-------*/
/*
 * no additional parameter
 */
/*----------------------Establish Request,Confirm,Indication (Draft,RFC)-------*/

/*----------------------Release Indication, Request (Draft,RFC)----------------*/

 /* define parameters for Release Request and Indication Messages */
#define RELEASE_MGMT   0x0
#define RELEASE_PHYS   0x1
#define RELEASE_DM     0x2
#define RELEASE_OTHER  0x3

static const value_string release_reason_values[] = {
   { RELEASE_MGMT,    "Management layer generated release" },
   { RELEASE_PHYS,    "Physical layer alarm generated release" },
   { RELEASE_DM,      "Specific to a request" },
   { RELEASE_OTHER,   "Other reason" },
   { 0,               NULL } };

#define RELEASE_REASON_LENGTH_OFFSET PARAMETER_LENGTH_OFFSET
#define RELEASE_REASON_OFFSET        PARAMETER_VALUE_OFFSET
#define RELEASE_REASON_LENGTH        4

static void
dissect_release_reason_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   int offset = RELEASE_REASON_OFFSET;
   if(iua_version == DRAFT) offset = tvb_get_ntohs(parameter_tvb, RELEASE_REASON_LENGTH_OFFSET)+8;
   proto_tree_add_item(parameter_tree, hf_release_reason, parameter_tvb, offset, RELEASE_REASON_LENGTH, ENC_BIG_ENDIAN);
   if(iua_version != DRAFT)
      proto_item_append_text(parameter_item, " (%s)",
            val_to_str_const(tvb_get_ntohl(parameter_tvb, offset), release_reason_values, "Unknown release reason"));
}
/*----------------------Release Indication,Request (Draft,RFC)-----------------*/

/*----------------------Link Status Start,Stop Report (Draft,RFC)--------------*/
/*
 * No additional Parameter
 */
/*----------------------Link Status Start,Stop Report (Draft,RFC)--------------*/

/*----------------------Link Status Indication (Draft,RFC)---------------------*/

 /* define parameters for Link Status Indication */
#define LINK_STATUS_OPERTIONAL      0x0
#define LINK_STATUS_NON_OPERTIONAL  0x1

static const value_string link_status_values[] = {
   { LINK_STATUS_OPERTIONAL,      "Link operational" },
   { LINK_STATUS_NON_OPERTIONAL,  "Link not operational" },
   { 0,                           NULL } };

#define LINK_STATUS_OFFSET   PARAMETER_VALUE_OFFSET
#define LINK_STATUS_LENGTH   4

static void
dissect_link_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   proto_tree_add_item(parameter_tree, hf_link_status, parameter_tvb, LINK_STATUS_OFFSET, LINK_STATUS_LENGTH, ENC_BIG_ENDIAN);
   proto_item_append_text(parameter_item, " (%s)",
         val_to_str_const(tvb_get_ntohl(parameter_tvb, LINK_STATUS_OFFSET),link_status_values, "Unknown Link status"));

   link_status_operational = tvb_get_ntohl(parameter_tvb, LINK_STATUS_OFFSET);
}
/*----------------------Link Status Indication (Draft,RFC)---------------------*/

/*----------------------Sa-Bit (Draft,RFC)-------------------------------------*/

 /* define parameter for sa-bit message */
#define SA_BIT_ID_ZERO     0x0
#define SA_BIT_ID_ONE      0x1
#define SA_BIT_VALUE_SA7   0x7

static const value_string sa_bit_values[] = {
   { SA_BIT_ID_ZERO,    "set value ZERO" },
   { SA_BIT_ID_ONE,     "set value ONE" },
   { SA_BIT_VALUE_SA7,  "Addresses the Sa7 Bit" },
   { 0,                 NULL } };

#define SA_BIT_ID_OFFSET     PARAMETER_VALUE_OFFSET
#define SA_BIT_ID_LENGTH     2
#define SA_BIT_VALUE_OFFSET  (SA_BIT_ID_OFFSET + SA_BIT_ID_LENGTH)
#define SA_BIT_VALUE_LENGTH  2

static void
dissect_sa_bit_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   proto_tree_add_item(parameter_tree, hf_sa_bit_id, parameter_tvb, SA_BIT_ID_OFFSET, SA_BIT_ID_LENGTH, ENC_BIG_ENDIAN);
   proto_tree_add_item(parameter_tree, hf_sa_bit_value, parameter_tvb, SA_BIT_VALUE_OFFSET, SA_BIT_VALUE_LENGTH, ENC_BIG_ENDIAN);
   proto_item_append_text(parameter_item, " (%s %s)",
         val_to_str_const(tvb_get_ntohs(parameter_tvb, SA_BIT_ID_OFFSET), sa_bit_values, "unknown"),
         val_to_str_const(tvb_get_ntohs(parameter_tvb, SA_BIT_VALUE_OFFSET), sa_bit_values, "unknown Bit"));

   sa_bit_id = tvb_get_ntohs(parameter_tvb, SA_BIT_VALUE_OFFSET);
}
/*----------------------Sa-Bit (Draft,RFC)-------------------------------------*/

/*----------------------Error Indication (RFC)---------------------------------*/

#define ERROR_REASON_OVERLOAD 0x1

static const value_string error_reason_values[] = {
   { ERROR_REASON_OVERLOAD, "C-Channel is in overload state" },
   { 0,                     NULL } };

#define ERROR_REASON_LENGTH 4
#define ERROR_REASON_OFFSET PARAMETER_VALUE_OFFSET

static void
dissect_error_indication_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   proto_tree_add_item(parameter_tree, hf_error_reason, parameter_tvb, ERROR_REASON_OFFSET, ERROR_REASON_LENGTH, ENC_BIG_ENDIAN);
   proto_item_append_text(parameter_item, " (%s)",
         val_to_str_const(tvb_get_ntohl(parameter_tvb, ERROR_REASON_OFFSET), error_reason_values, "unknown"));
}
/*----------------------Error Indication (RFC)---------------------------------*/

/*--------------------------ASP identifier-------------------------------------*/
#define ASP_IDENTIFIER_LENGTH 4
#define ASP_IDENTIFIER_OFFSET PARAMETER_VALUE_OFFSET

static void
dissect_asp_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   proto_tree_add_item(parameter_tree, hf_asp_identifier, parameter_tvb, ASP_IDENTIFIER_OFFSET, ASP_IDENTIFIER_LENGTH, ENC_BIG_ENDIAN);
   proto_item_append_text(parameter_item, " (%d) ",tvb_get_ntohl(parameter_tvb,ASP_IDENTIFIER_OFFSET));
}
/*--------------------------ASP identifier-------------------------------------*/

#define INFO_STRING_OFFSET PARAMETER_VALUE_OFFSET

static void
dissect_info_string_parameter(packet_info *pinfo, tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
   uint16_t info_string_length;
   const uint8_t* str;

   info_string_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
   if(iua_version == DRAFT) info_string_length += 4;
   if(info_string_length > 4){
      info_string_length -= PARAMETER_HEADER_LENGTH;
      proto_tree_add_item_ret_string(parameter_tree, hf_info_string, parameter_tvb, INFO_STRING_OFFSET, info_string_length, ENC_ASCII, pinfo->pool, &str);
      proto_item_append_text(parameter_item, " (%s)", str);
   }
}


static void
dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{

   uint16_t parameter_value_length;

   parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
   if (parameter_value_length > 0)
      proto_tree_add_item(parameter_tree, hf_parameter_value, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, ENC_NA);

   proto_item_append_text(parameter_item, " with tag %u and %u byte%s value",
         tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET), parameter_value_length, plurality(parameter_value_length, "", "s"));
}

#define Reserved_TAG               0x00
#define INT_INTERFACE_IDENTIFIER_PARAMETER_TAG           0x01
#define ASP_MSG_PARAMETER_TAG                            0x02
#define TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG          0x03
#define INFO_PARAMETER_TAG                               0x04
#define DLCI_PARAMETER_TAG                               0x81
#define DIAGNOSTIC_INFORMATION_PARAMETER_TAG             0x07
#define INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG 0x08
#define HEARTBEAT_DATA_PARAMETER_TAG                     0x09
#define ASP_DOWN_REASON_PARAMETER_TAG                    0x0a
#define TRAFFIC_MODE_TYPE_PARAMETER_TAG                  0x0b
#define ERROR_CODE_PARAMETER_TAG                         0x0c
#define STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG        0x0d
#define PROTOCOL_DATA_PARAMETER_TAG                      0x0e
#define RELEASE_REASON_PARAMETER_TAG                     0x0f
#define TEI_STATUS_PARAMETER_TAG                         0x10
#define ASP_IDENTIFIER_PARAMETER_TAG                     0x11
#define NOT_USED_IN_IUA_PARAMETER_TAG                    0x12
#define LINK_STATUS_PARAMETER_TAG                        0x82
#define SA_BIT_STATUS_PARAMETER_TAG                      0x83
#define ERROR_INDICATION_PARAMETER_TAG                   0x84

static const value_string parameter_tag_values[] = {
   { Reserved_TAG,                   "Reserved" },
   { INT_INTERFACE_IDENTIFIER_PARAMETER_TAG,              "Interface Identifier (integer)" },
   { TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG,             "Interface Identifier (text)" },
   { INFO_PARAMETER_TAG,                                  "Info string" },
   { DLCI_PARAMETER_TAG,                                  "DLCI" },
   { DIAGNOSTIC_INFORMATION_PARAMETER_TAG,                "Diagnostic information" },
   { INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG,    "Interface Identifier Range" },
   { HEARTBEAT_DATA_PARAMETER_TAG,                        "Hearbeat data" },
   { ASP_DOWN_REASON_PARAMETER_TAG,                       "ASP DOWN Reason" },
   { TRAFFIC_MODE_TYPE_PARAMETER_TAG,                     "Traffic mode type" },
   { ERROR_CODE_PARAMETER_TAG,                            "Error code" },
   { STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG,           "Status type/identification" },
   { PROTOCOL_DATA_PARAMETER_TAG,                         "Protocol Data" },
   { RELEASE_REASON_PARAMETER_TAG,                        "Release Reason" },
   { TEI_STATUS_PARAMETER_TAG,                            "TEI status" },
   { ASP_IDENTIFIER_PARAMETER_TAG,                        "ASP Identifier" },
   { NOT_USED_IN_IUA_PARAMETER_TAG,                       "Not used in IUA" },
   { LINK_STATUS_PARAMETER_TAG,                           "Link status" },
   { SA_BIT_STATUS_PARAMETER_TAG,                         "SA-Bit status" },
   { ERROR_INDICATION_PARAMETER_TAG,                      "Error reason" },
   { 0,                                                    NULL } };

static const value_string parameter_tag_draft_values[] = {
   { INT_INTERFACE_IDENTIFIER_PARAMETER_TAG,              "V5UA Interface Identifier (int)" },
   { ASP_MSG_PARAMETER_TAG,                               "ASP Adaption Layer ID" },
   { TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG,             "SCN Protocol Identifier" },
   { INFO_PARAMETER_TAG,                                  "Info" },
   { PROTOCOL_DATA_PARAMETER_TAG,                         "Protocol Data" },
   { LINK_STATUS_PARAMETER_TAG,                           "Link status" },
   { SA_BIT_STATUS_PARAMETER_TAG,                         "SA-Bit status" },
   { ERROR_INDICATION_PARAMETER_TAG,                      "Error reason" },
   { 0,                                                   NULL } };

static void
dissect_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *v5ua_tree)
{
   uint16_t tag, length, padding_length;
   proto_item *parameter_item;
   proto_tree *parameter_tree;

   /* extract tag and length from the parameter */
   tag      = tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET);
   length   = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
   /* on IUA-Draft messages the message length not including the message header */
   if((iua_version==DRAFT)&&(tag<=0x4)){
      /* at V5UA Header, length of header and length of DLCI+EFA must be added */
      if(tag==0x1)       length += 8;
      /* at ASP message tags only length of header must be added */
      else if(tag<=0x4)  length += PARAMETER_HEADER_LENGTH;
      /* for following message-tags are no length information available. Only in common msg header */
      if((msg_class==0 || msg_class==1 || msg_class==9) && msg_type<=10)
         length = msg_length;
   }
   padding_length = tvb_reported_length(parameter_tvb) - length;
   paddingl = padding_length;

   /* create proto_tree stuff */
   switch(iua_version){
      case RFC:
         parameter_tree   = proto_tree_add_subtree(v5ua_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, -1, ett_v5ua_parameter, &parameter_item,
               val_to_str_const(tag, parameter_tag_values, "Unknown parameter"));
         /* add tag to the v5ua tree */
         proto_tree_add_item(parameter_tree, hf_parameter_tag, parameter_tvb, PARAMETER_TAG_OFFSET, PARAMETER_TAG_LENGTH, ENC_BIG_ENDIAN);
         break;
      case DRAFT:
      default:
         parameter_tree   = proto_tree_add_subtree(v5ua_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, -1, ett_v5ua_parameter, &parameter_item,
               val_to_str_const(tag, parameter_tag_draft_values, "Unknown parameter"));

         /* add tag to the v5ua tree */
         proto_tree_add_item(parameter_tree, hf_parameter_tag_draft, parameter_tvb, PARAMETER_TAG_OFFSET, PARAMETER_TAG_LENGTH, ENC_BIG_ENDIAN);
         break;
   };

   /* add length to the v5ua tree */
   proto_tree_add_item(parameter_tree, hf_parameter_length, parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, ENC_BIG_ENDIAN);

   switch(tag) {
      case INT_INTERFACE_IDENTIFIER_PARAMETER_TAG:
         if(iua_version == RFC) dissect_int_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
         if(iua_version == DRAFT){
            dissect_int_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
            dissect_dlci_parameter(parameter_tvb, parameter_tree, parameter_item, pinfo);

            /* for the following parameters no tag- and length-informations available. Parameters must be dissect with info from common msg header */
            if(msg_class==0 && msg_type==0)    dissect_draft_error_code_parameter(parameter_tvb, parameter_tree);
            if(msg_class==1)                   dissect_draft_tei_status_parameter(parameter_tvb, parameter_tree, parameter_item);
            if(msg_class==9){
               if(msg_type==1||msg_type==2||msg_type==3||msg_type==4){
                  uint16_t length_2, offset;
                  tvbuff_t *layer3_data_tvb;
                  offset = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) + 8;
                  length_2 = msg_length - offset;
                  if(length_2 > 0){
                     if(tvb_get_uint8(parameter_tvb, offset) == 0x48){
                        layer3_data_tvb = tvb_new_subset_length(parameter_tvb, offset, length_2);
                        dissect_layer3_message(layer3_data_tvb, v5ua_tree, parameter_item, pinfo);
                     }
                  }
               }
               else if(msg_type==8||msg_type==10) dissect_release_reason_parameter(parameter_tvb, parameter_tree, parameter_item);
            }
         }
         break;
      case ASP_MSG_PARAMETER_TAG:
         dissect_asp_msg_parameter(pinfo, parameter_tvb, parameter_tree, parameter_item);
         break;
      case TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG:
         if(iua_version == RFC)
            dissect_text_interface_identifier_parameter(pinfo, parameter_tvb, parameter_tree, parameter_item);
         if(iua_version == DRAFT)
            dissect_scn_protocol_id_parameter(pinfo, parameter_tvb, parameter_tree, parameter_item);
         break;
      case INFO_PARAMETER_TAG:
         dissect_info_string_parameter(pinfo, parameter_tvb, parameter_tree, parameter_item);
         break;
      case DLCI_PARAMETER_TAG:
         dissect_dlci_parameter(parameter_tvb, parameter_tree, parameter_item, pinfo);
         break;
      case DIAGNOSTIC_INFORMATION_PARAMETER_TAG:
         dissect_diagnostic_information_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG:
         dissect_integer_range_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case HEARTBEAT_DATA_PARAMETER_TAG:
         dissect_heartbeat_data_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case ASP_DOWN_REASON_PARAMETER_TAG:
         dissect_asp_reason_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case TRAFFIC_MODE_TYPE_PARAMETER_TAG:
         dissect_traffic_mode_type_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case ERROR_CODE_PARAMETER_TAG:
         dissect_error_code_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG:
         dissect_status_type_identification_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case PROTOCOL_DATA_PARAMETER_TAG:
         dissect_layer3_message(parameter_tvb, v5ua_tree, parameter_item, pinfo);
         break;
      case RELEASE_REASON_PARAMETER_TAG:
         dissect_release_reason_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case TEI_STATUS_PARAMETER_TAG:
         dissect_tei_status_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case ASP_IDENTIFIER_PARAMETER_TAG:
         dissect_asp_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case LINK_STATUS_PARAMETER_TAG:
         dissect_link_status_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case SA_BIT_STATUS_PARAMETER_TAG:
         dissect_sa_bit_status_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
      case ERROR_INDICATION_PARAMETER_TAG:
         dissect_error_indication_parameter( parameter_tvb, parameter_tree, parameter_item);
         break;
      default:
         dissect_unknown_parameter(parameter_tvb, parameter_tree, parameter_item);
         break;
   };

   if (padding_length > 0){
      proto_tree_add_item(parameter_tree, hf_parameter_padding, parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, ENC_NA);
   }
}
/* dissect the V5UA-Parameters into subsets which are separated by Tag-Length-Header and call up the dissector for the subsets */
static void
dissect_parameters(tvbuff_t *parameters_tvb, packet_info *pinfo, proto_tree *tree _U_, proto_tree *v5ua_tree)
{
   int tag, offset, length, total_length, remaining_length;
   tvbuff_t *parameter_tvb;


   offset = 0;
   while((remaining_length = tvb_reported_length_remaining(parameters_tvb, offset))) {
      tag = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_TAG_OFFSET);
      length = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);
      if(iua_version==DRAFT){
         if(tag==0x1) length += 8;  /* V5UA Header */
         else if(tag<=0x4) length += PARAMETER_HEADER_LENGTH; /* ASP MSGs */

         /* add the parameters which are not separated by tag-length-header to the V5UA header */
         if((msg_class==0 || msg_class==1 || msg_class==9)&&msg_type<=10)
            length = msg_length;
      }
      total_length = WS_ROUNDUP_4(length);
      if (remaining_length >= length)
         total_length = MIN(total_length, remaining_length);
      /* create a tvb for the parameter including the padding bytes */
      parameter_tvb  = tvb_new_subset_length(parameters_tvb, offset, total_length);
      dissect_parameter(parameter_tvb, pinfo, v5ua_tree);
      /* get rid of the handled parameter */
      offset += total_length;
   }
}


 /* define the common header fields of V5UA MSG */
#define COMMON_HEADER_VERSION_LENGTH        1
#define COMMON_HEADER_RESERVED_LENGTH       1
#define COMMON_HEADER_MSG_CLASS_LENGTH      1
#define COMMON_HEADER_MSG_TYPE_LENGTH       1
#define COMMON_HEADER_MSG_LENGTH_LENGTH     4
#define COMMON_HEADER_LENGTH                (COMMON_HEADER_VERSION_LENGTH + COMMON_HEADER_RESERVED_LENGTH +\
                                             COMMON_HEADER_MSG_CLASS_LENGTH + COMMON_HEADER_MSG_TYPE_LENGTH +\
                                             COMMON_HEADER_MSG_LENGTH_LENGTH)

 /* define the offsets of common header */
#define COMMON_HEADER_OFFSET            0
#define COMMON_HEADER_VERSION_OFFSET    COMMON_HEADER_OFFSET
#define COMMON_HEADER_RESERVED_OFFSET   (COMMON_HEADER_VERSION_OFFSET       + COMMON_HEADER_VERSION_LENGTH)
#define COMMON_HEADER_MSG_CLASS_OFFSET  (COMMON_HEADER_RESERVED_OFFSET      + COMMON_HEADER_RESERVED_LENGTH)
#define COMMON_HEADER_MSG_TYPE_OFFSET   (COMMON_HEADER_MSG_CLASS_OFFSET     + COMMON_HEADER_MSG_CLASS_LENGTH)
#define COMMON_HEADER_MSG_LENGTH_OFFSET (COMMON_HEADER_MSG_TYPE_OFFSET      + COMMON_HEADER_MSG_TYPE_LENGTH)
#define COMMON_HEADER_PARAMETERS_OFFSET (COMMON_HEADER_OFFSET               + COMMON_HEADER_LENGTH)

 /* version of V5UA protocol */
#define V5UA_PROTOCOL_VERSION_RELEASE_1     1

static const value_string v5ua_protocol_version_values[] = {
   { V5UA_PROTOCOL_VERSION_RELEASE_1,  "Release 1.0" },
   { 0,                                NULL } };

 /* define V5UA MSGs */
#define MSG_CLASS_MGMT_MSG        0
#define MSG_CLASS_MGMT_MSG_DRAFT  1
#define MSG_CLASS_ASPSM_MSG       3
#define MSG_CLASS_ASPTM_MSG       4
#define MSG_CLASS_V5PTM_MSG_DRAFT 9
#define MSG_CLASS_V5PTM_MSG      14

static const value_string msg_class_values[] = {
   { MSG_CLASS_MGMT_MSG,  "Management Messages" },
   { MSG_CLASS_MGMT_MSG_DRAFT,"Management Messages"},
   { MSG_CLASS_ASPSM_MSG, "ASP State Maintenance Message" },
   { MSG_CLASS_ASPTM_MSG, "ASP Traffic Maintenance Message" },
   { MSG_CLASS_V5PTM_MSG_DRAFT, "V5 Boundary Primitives Transport Message" },
   { MSG_CLASS_V5PTM_MSG, "V5 Boundary Primitives Transport Message" },
   { 0,                           NULL } };

 /* message types for MGMT messages */
#define MGMT_MSG_TYPE_ERR                  0
#define MGMT_MSG_TYPE_NTFY                 1
#define MGMT_MSG_TYPE_TEI_STATUS_REQ       2
#define MGMT_MSG_TYPE_TEI_STATUS_CON       3
#define MGMT_MSG_TYPE_TEI_STATUS_IND       4
#define MGMT_MSG_TYPE_TEI_QUERY_REQUEST5  5
#define MGMT_MSG_TYPE_TEI_QUERY_REQUEST   8
 /* end */

 /* MGMT messages for Nortel draft version*/
#define MGMT_MSG_DRAFT_TYPE_TEI_STATUS_REQ       1
#define MGMT_MSG_DRAFT_TYPE_TEI_STATUS_CON       2
#define MGMT_MSG_DRAFT_TYPE_TEI_STATUS_IND       3
#define MGMT_MSG_DRAFT_TYPE_TEI_QUERY_REQUEST5  5
#define MGMT_MSG_DRAFT_TYPE_TEI_QUERY_REQUEST   8
 /* end */

 /* message types for ASPSM messages */
#define ASPSM_MSG_TYPE_Reserved             0
#define ASPSM_MSG_TYPE_UP                   1
#define ASPSM_MSG_TYPE_DOWN                 2
#define ASPSM_MSG_TYPE_BEAT                 3
#define ASPSM_MSG_TYPE_UP_ACK               4
#define ASPSM_MSG_TYPE_DOWN_ACK             5
#define ASPSM_MSG_TYPE_BEAT_ACK             6

 /* message types for ASPTM messages */
#define ASPTM_MSG_TYPE_Reserved             0
#define ASPTM_MSG_TYPE_ACTIVE               1
#define ASPTM_MSG_TYPE_INACTIVE             2
#define ASPTM_MSG_TYPE_ACTIVE_ACK           3
#define ASPTM_MSG_TYPE_INACTIVE_ACK         4

 /* message types for V5PTM messages */
#define V5PTM_MSG_TYPE_Reserved                     0
#define V5PTM_MSG_TYPE_DATA_REQUEST                 1
#define V5PTM_MSG_TYPE_DATA_INDICATION              2
#define V5PTM_MSG_TYPE_UNIT_DATA_REQUEST            3
#define V5PTM_MSG_TYPE_UNIT_DATA_INDICATION         4
#define V5PTM_MSG_TYPE_ESTABLISH_REQUEST            5
#define V5PTM_MSG_TYPE_ESTABLISH_CONFIRM            6
#define V5PTM_MSG_TYPE_ESTABLISH_INDICATION         7
#define V5PTM_MSG_TYPE_RELEASE_REQUEST              8
#define V5PTM_MSG_TYPE_RELEASE_CONFIRM              9
#define V5PTM_MSG_TYPE_RELEASE_INDICATION          10
#define V5PTM_MSG_TYPE_LINK_STATUS_START_REPORTING 11
#define V5PTM_MSG_TYPE_LINK_STATUS_STOP_REPORTING  12
#define V5PTM_MSG_TYPE_LINK_STATUS_INDICATION      13
#define V5PTM_MSG_TYPE_SA_BIT_SET_REQUEST          14
#define V5PTM_MSG_TYPE_SA_BIT_SET_CONFIRM          15
#define V5PTM_MSG_TYPE_SA_BIT_STATUS_REQUEST       16
#define V5PTM_MSG_TYPE_SA_BIT_STATUS_INDICATION    17
#define V5PTM_MSG_TYPE_ERROR_INDICATION            18

#define MGMT_MSG_TYPE_TEI_STATUS_REQUEST5  5
#define MGMT_MSG_TYPE_TEI_STATUS_REQUEST   8

static const value_string msg_class_type_values[] = {
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_ERR,                         "Error" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_NTFY,                        "Notify" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_STATUS_REQ,              "TEI status request" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_STATUS_CON,              "TEI status confirmation" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_STATUS_IND,              "TEI status indication" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_QUERY_REQUEST,           "TEI query request" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_QUERY_REQUEST5,          "TEI query request" },

   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_STATUS_REQ,   "TEI status request" },
   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_STATUS_CON,   "TEI status confirmation" },
   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_STATUS_IND,   "TEI status indication" },
   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_QUERY_REQUEST,  "TEI query request" },
   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_QUERY_REQUEST5, "TEI query request" },


   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_Reserved,                   "Reserved" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_UP,                         "ASP up" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_DOWN,                       "ASP down" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_BEAT,                       "Heartbeat" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_UP_ACK,                     "ASP up ack" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_DOWN_ACK,                   "ASP down ack" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_BEAT_ACK,                   "Heartbeat ack" },

   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_Reserved ,                  "Reserved" },
   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_ACTIVE ,                    "ASP active" },
   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_INACTIVE ,                  "ASP inactive" },
   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_ACTIVE_ACK ,                "ASP active ack" },
   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_INACTIVE_ACK ,              "ASP inactive ack" },

   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_Reserved,                   "Reserved" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_DATA_REQUEST,               "Data request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_DATA_INDICATION,            "Data indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_UNIT_DATA_REQUEST,          "Unit data request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_UNIT_DATA_INDICATION,       "Unit data indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_ESTABLISH_REQUEST,          "Establish request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_ESTABLISH_CONFIRM,          "Establish confirmation" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_ESTABLISH_INDICATION,       "Establish indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_RELEASE_REQUEST,            "Release request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_RELEASE_CONFIRM,            "Release confirmation" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_RELEASE_INDICATION,         "Release indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_LINK_STATUS_START_REPORTING,"Link status start reporting" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_LINK_STATUS_STOP_REPORTING, "Link status stop reporting" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_LINK_STATUS_INDICATION,     "Link status indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_SA_BIT_SET_REQUEST,         "Sa-Bit set request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_SA_BIT_SET_CONFIRM,         "Sa-Bit set confirm" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_SA_BIT_STATUS_REQUEST,      "Sa-Bit status request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_SA_BIT_STATUS_INDICATION,   "Sa-Bit status indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_ERROR_INDICATION,           "Error indication" },

   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_Reserved,                   "Reserved" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_DATA_REQUEST,               "Data request" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_DATA_INDICATION,            "Data indication" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_UNIT_DATA_REQUEST,          "Unit data request" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_UNIT_DATA_INDICATION,       "Unit data indication" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_ESTABLISH_REQUEST,          "Establish request" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_ESTABLISH_CONFIRM,          "Establish confirmation" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_ESTABLISH_INDICATION,       "Establish indication" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_RELEASE_REQUEST,            "Release request" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_RELEASE_CONFIRM,            "Release confirmation" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_RELEASE_INDICATION,         "Release indication" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_LINK_STATUS_START_REPORTING,"Link status start reporting" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_LINK_STATUS_STOP_REPORTING, "Link status stop reporting" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_LINK_STATUS_INDICATION,     "Link status indication" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_SA_BIT_SET_REQUEST,         "Sa-Bit set request" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_SA_BIT_SET_CONFIRM,         "Sa-Bit set confirm" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_SA_BIT_STATUS_REQUEST,      "Sa-Bit status request" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_SA_BIT_STATUS_INDICATION,   "Sa-Bit status indication" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_ERROR_INDICATION,           "Error indication" },

   { 0,                                                                                  NULL } };

static const value_string msg_class_type_values_short[] = {
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_ERR,                         "Error" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_NTFY,                        "Notify" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_STATUS_REQ,              "TEI status request" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_STATUS_CON,              "TEI status confirmation" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_STATUS_IND,              "TEI status indication" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_QUERY_REQUEST,           "TEI query request" },
   { MSG_CLASS_MGMT_MSG  * 256 + MGMT_MSG_TYPE_TEI_QUERY_REQUEST5,          "TEI query request" },

   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_STATUS_REQ,   "TEI status request" },
   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_STATUS_CON,   "TEI status confirmation" },
   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_STATUS_IND,   "TEI status indication" },
   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_QUERY_REQUEST,  "TEI query request" },
   { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_QUERY_REQUEST5, "TEI query request" },


   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_Reserved,                   "Reserved" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_UP,                         "ASP up" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_DOWN,                       "ASP down" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_BEAT,                       "Heartbeat" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_UP_ACK,                     "ASP up ack" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_DOWN_ACK,                   "ASP down ack" },
   { MSG_CLASS_ASPSM_MSG * 256 + ASPSM_MSG_TYPE_BEAT_ACK,                   "Heartbeat ack" },

   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_Reserved ,                  "Reserved" },
   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_ACTIVE ,                    "ASP active" },
   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_INACTIVE ,                  "ASP inactive" },
   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_ACTIVE_ACK ,                "ASP active ack" },
   { MSG_CLASS_ASPTM_MSG * 256 + ASPTM_MSG_TYPE_INACTIVE_ACK ,              "ASP inactive ack" },

   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_Reserved,                   "Reserved" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_DATA_REQUEST,               "Data request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_DATA_INDICATION,            "Data indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_UNIT_DATA_REQUEST,          "Unit data request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_UNIT_DATA_INDICATION,       "Unit data indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_ESTABLISH_REQUEST,          "Establish request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_ESTABLISH_CONFIRM,          "Establish confirmation" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_ESTABLISH_INDICATION,       "Establish indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_RELEASE_REQUEST,            "Release request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_RELEASE_CONFIRM,            "Release confirmation" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_RELEASE_INDICATION,         "Release indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_LINK_STATUS_START_REPORTING,"Link status start reporting" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_LINK_STATUS_STOP_REPORTING, "Link status stop reporting" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_LINK_STATUS_INDICATION,     "Link status indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_SA_BIT_SET_REQUEST,         "Sa-Bit set request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_SA_BIT_SET_CONFIRM,         "Sa-Bit set confirm" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_SA_BIT_STATUS_REQUEST,      "Sa-Bit status request" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_SA_BIT_STATUS_INDICATION,   "Sa-Bit status indication" },
   { MSG_CLASS_V5PTM_MSG_DRAFT * 256 + V5PTM_MSG_TYPE_ERROR_INDICATION,           "Error indication" },


   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_Reserved,                   "Reserved" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_DATA_REQUEST,               "Data Req" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_DATA_INDICATION,            "Data Ind" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_UNIT_DATA_REQUEST,          "U Data Req" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_UNIT_DATA_INDICATION,       "U Data Ind" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_ESTABLISH_REQUEST,          "Est Req" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_ESTABLISH_CONFIRM,          "Est Conf" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_ESTABLISH_INDICATION,       "Est Ind" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_RELEASE_REQUEST,            "Rel Req" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_RELEASE_CONFIRM,            "Rel Con" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_RELEASE_INDICATION,         "Rel Ind" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_LINK_STATUS_START_REPORTING,"Link Status Start Rep" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_LINK_STATUS_STOP_REPORTING, "Link Status Stop Rep" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_LINK_STATUS_INDICATION,     "Link Status Ind" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_SA_BIT_SET_REQUEST,         "Sa-Bit Set Req" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_SA_BIT_SET_CONFIRM,         "Sa-Bit set Conf" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_SA_BIT_STATUS_REQUEST,      "Sa-Bit Status Req" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_SA_BIT_STATUS_INDICATION,   "Sa-Bit Status Ind" },
   { MSG_CLASS_V5PTM_MSG * 256 + V5PTM_MSG_TYPE_ERROR_INDICATION,           "Error Ind" },
   { 0,                                                                                  NULL } };


static void
dissect_common_header(tvbuff_t *common_header_tvb, packet_info *pinfo, proto_tree *v5ua_tree)
{
   proto_item *common_header_item;
   proto_tree *common_header_tree;

   uint8_t message_class, message_type;

   message_class  = tvb_get_uint8(common_header_tvb, COMMON_HEADER_MSG_CLASS_OFFSET);
   message_type   = tvb_get_uint8(common_header_tvb, COMMON_HEADER_MSG_TYPE_OFFSET);

   /* Add message type into info column */
   col_set_str(pinfo->cinfo, COL_INFO, val_to_str_const(message_class * 256 + message_type, msg_class_type_values_short, "UNKNOWN"));


   if (v5ua_tree) {

      /* create proto_tree stuff */
      common_header_tree   = proto_tree_add_subtree(v5ua_tree, common_header_tvb, COMMON_HEADER_OFFSET, -1,
                                ett_v5ua_common_header, &common_header_item, "Common Msg-Header");

      /* add the components of the common header to the protocol tree */
      proto_tree_add_item(common_header_tree, hf_version, common_header_tvb, COMMON_HEADER_VERSION_OFFSET, COMMON_HEADER_VERSION_LENGTH, ENC_BIG_ENDIAN);
      proto_tree_add_item(common_header_tree, hf_reserved, common_header_tvb, COMMON_HEADER_RESERVED_OFFSET, COMMON_HEADER_RESERVED_LENGTH, ENC_BIG_ENDIAN);
      proto_tree_add_item(common_header_tree, hf_msg_class, common_header_tvb, COMMON_HEADER_MSG_CLASS_OFFSET, COMMON_HEADER_MSG_CLASS_LENGTH, ENC_BIG_ENDIAN);
      proto_tree_add_uint_format_value(common_header_tree, hf_msg_type,
            common_header_tvb, COMMON_HEADER_MSG_TYPE_OFFSET, COMMON_HEADER_MSG_TYPE_LENGTH,
            message_type, "%s ( %u )",
            val_to_str_const(message_class * 256 + message_type, msg_class_type_values, "reserved"), message_type);
      proto_tree_add_item(common_header_tree, hf_msg_length, common_header_tvb, COMMON_HEADER_MSG_LENGTH_OFFSET, COMMON_HEADER_MSG_LENGTH_LENGTH, ENC_BIG_ENDIAN);

      /* Add message type to the Common Msg-Header line */
      proto_item_append_text(common_header_item, " (%s)",val_to_str_const(message_class * 256 + message_type, msg_class_type_values, "Unknown Msg-Type"));
      messageclassCopy = message_class;
   }

   /* the following info are required to dissect IUA-Draft messages.
      In the DRAFT-Specification V5UA-Parameters are not separated by Tag-Length-Header (as defined in RFC-Spec) */
   if (iua_version == DRAFT){
      msg_class = message_class;
      msg_type  = message_type;
      msg_length = tvb_get_ntohl (common_header_tvb, COMMON_HEADER_MSG_LENGTH_OFFSET);
   }
}

/* dissect the V5UA-packet in two subsets: Common Msg-Header (used by all msgs) and V5UA-parameter */
static void
dissect_v5ua_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_tree *v5ua_tree)
{
   tvbuff_t *common_header_tvb, *parameters_tvb;

   common_header_tvb = tvb_new_subset_length(tvb, COMMON_HEADER_OFFSET, COMMON_HEADER_LENGTH);
   dissect_common_header(common_header_tvb, pinfo, v5ua_tree);

   parameters_tvb    = tvb_new_subset_remaining(tvb, COMMON_HEADER_LENGTH);
   dissect_parameters(parameters_tvb, pinfo, tree, v5ua_tree);
   if (dlci_efa >= 0 && dlci_efa <= 8175) {
      if ((messageclassCopy == 0) || (messageclassCopy == 3) || (messageclassCopy == 4)) {
         messageclassCopy = -1;
      }
      else {
         col_append_str(pinfo->cinfo, COL_INFO, " | ");
         col_append_fstr(pinfo->cinfo, COL_INFO, "LinkId: %u", linkIdentifier);
      }
   }

   if (sa_bit_id > -1) {
      col_append_str(pinfo->cinfo, COL_INFO, " | ");
      col_append_fstr(pinfo->cinfo, COL_INFO, "SA7bit: %u", sa_bit_id);
      sa_bit_id = -1;
   }

   if (link_status_operational > -1) {
      if (link_status_operational == 0) {
         col_append_str(pinfo->cinfo, COL_INFO, " | operational");
      }
      else if (link_status_operational == 1) {
         col_append_str(pinfo->cinfo, COL_INFO, " | non-operational");
      }
      link_status_operational = -1;
   }

}

static int
dissect_v5ua(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
   int     offset, remaining_length, length, tag, one_bit;


   /* Set up structures needed to add the protocol subtree and manage it */
   proto_tree *v5ua_tree;
   proto_item *ti;

   /* Make entries in Protocol column and Info column on summary display */
   col_set_str(pinfo->cinfo, COL_PROTOCOL, "V5UA");
   /* end */
   col_clear(pinfo->cinfo, COL_INFO);

   /* create display subtree for the protocol */
   ti = proto_tree_add_item(tree, proto_v5ua, tvb, 0, -1, ENC_NA);
   v5ua_tree = proto_item_add_subtree(ti, ett_v5ua);

   /* detect version of IUA */
   iua_version = RFC;
   offset = COMMON_HEADER_LENGTH;

   remaining_length = tvb_reported_length_remaining(tvb, offset);

   while(remaining_length) {
      tag = tvb_get_ntohs(tvb, offset);
      /*0x01,0x03: Inerface Id (draft&RFC)*/
      if(tag==0x1){
         length = tvb_get_ntohs(tvb, offset+2);
         tag = tvb_get_ntohs(tvb, offset+length);
         /* tag 0x5 indicates the DLCI in the V5UA-Header accoriding to RFC spec */
         if(tag==0x81){
            remaining_length = false;
         }
         else{
            one_bit = tvb_get_uint8(tvb, offset+4+length+1);
            /* no indication from DLCI by tag (in the V5UA-Header according DRAFT).
               Thus the ONE-Bit within DLCI have to compare */
            if((one_bit & 0x01) == 0x01){
               iua_version = DRAFT;
               remaining_length = false;
            }
            /* an indication to incorrect bit in DLCI.
               Must be include to decode an incorrect implemented message on Nortels PVG*/
            else{
               proto_item_append_text(v5ua_tree, "   !! DLCI INCORRECT !!");

               iua_version = DRAFT;
               remaining_length = false;
            }
         }
      }
      /*0x02: AL Id (draft) following after common msg header without V5UA header*/
      else if(tag==0x02){
         iua_version = DRAFT;
         remaining_length = false;
      }
      /*0x03: Text formatted IId SHALL not be supported by draft*/
      else if(tag==0x03){
         iua_version = RFC;
         remaining_length = false;
      }
      else if(tag==0x11){
         remaining_length = false;
      }
      /*ASP, Notify and Error messages (RFC) only contain common msg header followed by parameter*/
      else if(tag==0x04 || tag == 0x0a || tag == 0x0b || tag == 0x0c || tag == 0x0d){
         remaining_length = false;
      }
      else{
         offset+=2;
         remaining_length = tvb_reported_length_remaining(tvb, offset);
      }
      /* add a notice for the draft version */
      if(iua_version == DRAFT){
         col_set_str(pinfo->cinfo, COL_PROTOCOL, "V5UA (draft)");
      }
   }

   /* dissect the message */
   dissect_v5ua_message(tvb, pinfo, tree, v5ua_tree);
   return tvb_captured_length(tvb);
}


/* Register the protocol with Wireshark */

/* this format is require because a script is used to build the C function
   that calls all the protocol registration. */

void
proto_register_v5ua(void)
{

   /* Setup list of header fields  */
   static hf_register_info hf[] = {
      { &hf_version,
         { "Version", "v5ua.version",
            FT_UINT8, BASE_DEC, VALS(v5ua_protocol_version_values), 0x0,
            NULL, HFILL } },
      { &hf_reserved,
         { "Reserved", "v5ua.reserved",
            FT_UINT8, BASE_HEX, NULL, 0x0,
            NULL, HFILL } },
      { &hf_msg_class,
         { "Message class", "v5ua.msg_class",
            FT_UINT8, BASE_DEC, VALS(msg_class_values), 0x0,
            NULL, HFILL } },
      { &hf_msg_type,
         { "Message Type", "v5ua.msg_type",
            FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL } },
#if 0
      { &hf_msg_type_id,
         { "Message Type ID", "v5ua.msg_type_id",
            FT_UINT8, BASE_DEC, VALS(msg_class_type_values), 0x0,
            NULL, HFILL } },
#endif
      { &hf_msg_length,
         { "Message length", "v5ua.msg_length",
            FT_UINT32, BASE_DEC, NULL, 0x0,
            NULL, HFILL } },
      { &hf_link_id,
         { "Link Identifier", "v5ua.link_id",
            FT_UINT32, BASE_DEC, NULL, 0xffffffe0,
            NULL, HFILL } },
      { &hf_chnl_id,
         { "Channel Identifier", "v5ua.channel_id",
            FT_UINT8, BASE_DEC, NULL, 0x1f,
            NULL, HFILL } },

      { &hf_adaptation_layer_id,
         { "Adaptation Layer ID", "v5ua.adaptation_layer_id",
            FT_STRING, BASE_NONE,NULL, 0x0,
            NULL, HFILL } },
      { &hf_text_if_id,
         { "Text interface identifier","v5ua.text_interface_id",
            FT_STRING, BASE_NONE,NULL, 0x0,
            NULL, HFILL } },
      { &hf_scn_protocol_id,
         { "SCN Protocol Identifier","v5ua.scn_protocol_id",
            FT_STRING, BASE_NONE,NULL, 0x0,
            NULL, HFILL } },
      { &hf_info_string,
         { "Info String", "v5ua.info_string",
            FT_STRING, BASE_NONE,NULL, 0x0,
            NULL, HFILL } },
      { &hf_asp_identifier,
         { "ASP Identifier", "v5ua.asp_identifier",
            FT_UINT32, BASE_HEX, NULL, 0x0,
            NULL, HFILL } },
      { &hf_dlci_zero_bit,
         { "Zero bit", "v5ua.dlci_zero_bit",
            FT_BOOLEAN, 8, NULL, 0x01,
            NULL, HFILL } },
      { &hf_dlci_spare_bit,
         { "Spare bit", "v5ua.dlci_spare_bit",
            FT_BOOLEAN, 8, NULL, 0x02,
            NULL, HFILL } },
      { &hf_dlci_sapi,
         { "SAPI", "v5ua.dlci_sapi",
            FT_UINT8, BASE_HEX, NULL, 0xfc,
            NULL, HFILL } },
      { &hf_dlci_one_bit,
         { "One bit", "v5ua.dlci_one_bit",
            FT_BOOLEAN, 8, NULL, 0x01,
            NULL, HFILL } },
      { &hf_dlci_tei,
         { "TEI", "v5ua.dlci_tei",
            FT_UINT8, BASE_HEX, NULL, 0xfe,
            NULL, HFILL } },
      { &hf_efa,
         { "Envelope Function Address","v5ua.efa",
            FT_UINT16, BASE_DEC, VALS(efa_values), 0x0,
            NULL, HFILL } },
#if 0
      { &hf_spare_efa,
         { "Envelope Function Address (spare)","v5ua.efa",
            FT_UINT16, BASE_DEC, NULL, ~7,
            NULL, HFILL } },
#endif
      { &hf_asp_reason,
         { "Reason", "v5ua.asp_reason",
            FT_UINT32, BASE_HEX, VALS(asp_reason_values), 0x0,
            NULL, HFILL } },
      { &hf_release_reason,
         { "Release Reason", "v5ua.release_reason",
            FT_UINT32, BASE_HEX, VALS(release_reason_values), 0x0,
            NULL, HFILL } },
      { &hf_tei_status,
         { "TEI status", "v5ua.tei_status",
            FT_UINT32, BASE_HEX, VALS(tei_status_values), 0x0,
            NULL, HFILL } },
      { &hf_tei_draft_status,
         { "TEI status", "v5ua.tei_draft_status",
            FT_UINT32, BASE_HEX, VALS(tei_draft_status_values), 0x0,
            NULL, HFILL } },
      { &hf_link_status,
         { "Link Status", "v5ua.link_status",
            FT_UINT32, BASE_HEX, VALS(link_status_values), 0x0,
            NULL, HFILL } },
      { &hf_sa_bit_id,
         { "BIT ID", "v5ua.sa_bit_id",
            FT_UINT16, BASE_HEX, VALS(sa_bit_values), 0x0,
            NULL, HFILL } },
      { &hf_sa_bit_value,
         { "Bit Value", "v5ua.sa_bit_value",
            FT_UINT16, BASE_HEX, VALS(sa_bit_values), 0x0,
            NULL, HFILL } },
      { &hf_parameter_tag,
         { "Parameter Tag", "v5ua.parameter_tag",
            FT_UINT16, BASE_HEX, VALS(parameter_tag_values), 0x0,
            NULL, HFILL } },
      { &hf_parameter_tag_draft,
         { "Parameter Tag", "v5ua.parameter_tag",
            FT_UINT16, BASE_HEX, VALS(parameter_tag_draft_values), 0x0,
            NULL, HFILL } },
      { &hf_parameter_length,
         { "Parameter length", "v5ua.parameter_length",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL } },
      { &hf_parameter_value,
         { "Parameter value", "v5ua.parameter_value",
            FT_BYTES, BASE_NONE,NULL, 0x0,
            NULL, HFILL } },
      { &hf_parameter_padding,
         { "Parameter padding", "v5ua.parameter_padding",
            FT_BYTES, BASE_NONE,NULL, 0x0,
            NULL, HFILL } },
      { &hf_diagnostic_info,
         { "Diagnostic Information", "v5ua.diagnostic_info",
            FT_BYTES, BASE_NONE,NULL, 0x0,
            NULL, HFILL } },
      { &hf_if_range_start,
         { "Interface range Start", "v5ua.interface_range_start",
            FT_UINT32, BASE_HEX, NULL, 0x0,
            NULL, HFILL } },
      { &hf_if_range_end,
         { "Interface range End", "v5ua.interface_range_end",
            FT_UINT32, BASE_HEX, NULL, 0x0,
            NULL, HFILL } },
      { &hf_heartbeat_data,
         { "Heartbeat data", "v5ua.heartbeat_data",
            FT_BYTES, BASE_NONE,NULL, 0x0,
            NULL, HFILL } },
      { &hf_traffic_mode_type,
         { "Traffic mode type", "v5ua.traffic_mode_type",
            FT_UINT32, BASE_HEX, VALS(traffic_mode_type_values), 0x0,
            NULL, HFILL } },
      { &hf_error_code,
         { "Error code", "v5ua.error_code",
            FT_UINT32, BASE_HEX, VALS(error_code_values), 0x0,
            NULL, HFILL } },
      { &hf_draft_error_code,
         { "Error code (draft)", "v5ua.draft_error_code",
            FT_UINT32, BASE_HEX, VALS(draft_error_code_values), 0x0,
            NULL, HFILL } },
      { &hf_status_type,
         { "Status type", "v5ua.status_type",
            FT_UINT16, BASE_DEC, VALS(status_type_values), 0x0,
            NULL, HFILL } },
      { &hf_status_id,
         { "Status identification", "v5ua.status_id",
            FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL } },
      { &hf_error_reason,
         { "Error Reason", "v5ua.error_reason",
            FT_UINT32, BASE_HEX, VALS(error_reason_values), 0x0,
            NULL, HFILL } }
   };

   /* Setup protocol subtree array */
   static int *ett[] = {
      &ett_v5ua,
      &ett_v5ua_common_header,
      &ett_v5ua_parameter,
      &ett_v5ua_layer3
   };

   /* Register the protocol name and description */
   proto_v5ua = proto_register_protocol("V5.2-User Adaptation Layer", "V5UA", "v5ua");

   /* Required function calls to register the header fields and subtrees used */
   proto_register_field_array(proto_v5ua, hf, array_length(hf));
   proto_register_subtree_array(ett, array_length(ett));

   /* Register the dissector handle */
   v5ua_handle = register_dissector("v5ua", dissect_v5ua, proto_v5ua);
}


/* In RFC specification the SCTP registered User Port Number Assignment for V5UA is 5675 */
#define SCTP_PORT_V5UA_RFC         5675
#define SCTP_PORT_V5UA_DRAFT      10001

void
proto_reg_handoff_v5ua(void)
{
   q931_handle = find_dissector_add_dependency("q931", proto_v5ua);
   v52_handle = find_dissector_add_dependency("v52", proto_v5ua);

   dissector_add_uint("sctp.port", SCTP_PORT_V5UA_DRAFT, v5ua_handle);
   dissector_add_uint("sctp.port", SCTP_PORT_V5UA_RFC, v5ua_handle);
   dissector_add_uint("sctp.ppi",  V5UA_PAYLOAD_PROTOCOL_ID, v5ua_handle);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */