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packet-v5ua.c

/* packet-v5ua.c
 * 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>
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 1998 Gerald Combs
 * 
 * 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 "moduleinfo.h"

#include <gmodule.h>

#ifndef ENABLE_STATIC
G_MODULE_EXPORT const gchar version[] = VERSION;
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <glib.h>

#include <ctype.h>
#include <epan/packet.h>
#include <epan/addr_resolv.h>
#include <epan/strutil.h>
#include "sctpppids.h"      /* include V5UA payload protocol ID */


#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif

#include <epan/packet.h>
#include "moduleinfo.h"


/* Initialize the protocol and registered fields */

static int proto_v5ua                    = -1;


static dissector_handle_t q931_handle;

      /* round up parameter length to multiple of four */
#define ADD_PADDING(x) ((((x) + 3) >> 2) << 2)

   /* common msg-header */
static int hf_version               = -1;
static int hf_reserved              = -1;
static int hf_msg_class             = -1;
static int hf_msg_type              = -1;
static int hf_msg_type_id           = -1;
static int hf_msg_length            = -1;
   /* V5UA message header */
static int hf_link_id               = -1;
static int hf_chnl_id               = -1;
static int hf_adaptation_layer_id   = -1;
static int hf_text_if_id     = -1;
static int hf_scn_protocol_id       = -1;
static int hf_info_string           = -1;
static int hf_dlci_zero_bit         = -1;
static int hf_dlci_spare_bit        = -1;
static int hf_dlci_sapi             = -1;
static int hf_dlci_one_bit          = -1;
static int hf_dlci_tei              = -1;
static int hf_efa                   = -1;
static int hf_spare_efa             = -1;

   /* variable length parameter (msg) */
static int hf_parameter_tag         = -1;
static int hf_parameter_tag_draft   = -1;
static int hf_parameter_length      = -1;
static int hf_parameter_value       = -1;
static int hf_parameter_padding     = -1;


      /* parameter fields */
static int hf_link_status           = -1;
static int hf_sa_bit_id             = -1;
static int hf_sa_bit_value          = -1;
static int hf_diagnostic_info       = -1;
static int hf_if_range_start        = -1;
static int hf_if_range_end          = -1;
static int hf_heartbeat_data        = -1;
static int hf_traffic_mode_type     = -1;
static int hf_error_code            = -1;
static int hf_draft_error_code      = -1;
static int hf_status_type           = -1;
static int hf_status_id             = -1;
static int hf_error_reason          = -1;
static int hf_asp_reason            = -1;
static int hf_tei_status            = -1;
static int hf_tei_draft_status      = -1;
static int hf_release_reason        = -1;

      /* Layer 3 message fields */
static int hf_l3_protocol_discriminator  = -1;
static int hf_l3_adress                  = -1;
static int hf_l3_low_adress              = -1;
static int hf_l3_msg_type                = -1;
static int hf_l3_info_element            = -1;

static int hf_l3_sequence_number         = -1;
static int hf_l3_v5_link_id              = -1;
static int hf_l3_v5_time_slot            = -1;

            /*PSTN Message*/
static int hf_l3_line_info               = -1;
static int hf_l3_cad_ringing             = -1;
static int hf_l3_pulse_type              = -1;
static int hf_l3_suppression_indicator   = -1;
static int hf_l3_pulse_duration          = -1;
static int hf_l3_ack_request_indicator   = -1;
static int hf_l3_number_of_pulses        = -1;
static int hf_l3_steady_signal           = -1;
static int hf_l3_auto_signalling_sequence= -1;
static int hf_l3_pulse_notify            = -1;
static int hf_l3_sequence_response       = -1;
static int hf_l3_digit_ack               = -1;
static int hf_l3_digit_info              = -1;
static int hf_l3_res_unavailable         = -1;
static int hf_l3_state                   = -1;
static int hf_l3_cause_type              = -1;
static int hf_l3_pstn_sequence_number    = -1;
static int hf_l3_duration_type           = -1;
            /*link control*/
static int hf_l3_link_control_function   = -1;
            /*Protection protocol*/
static int hf_l3_rejection_cause_type    = -1;
            /*BCC protocol*/
static int hf_l3_pstn_user_port_id            = -1;
static int hf_l3_pstn_user_port_id_lower      = -1;
static int hf_l3_isdn_user_port_id            = -1;
static int hf_l3_isdn_user_port_id_lower      = -1;
static int hf_l3_isdn_user_port_ts_num        = -1;
static int hf_l3_override                     = -1;
static int hf_l3_reject_cause_type            = -1;
static int hf_l3_bcc_protocol_error_cause     = -1;
static int hf_l3_connection_incomplete_reason = -1;
            /*Control protocol*/
static int hf_l3_control_function_element = -1;
static int hf_l3_control_function_id      = -1;
static int hf_l3_variant                  = -1;
static int hf_l3_if_id                    = -1;
static int hf_l3_performance_grading      = -1;
static int hf_l3_cp_rejection_cause       = -1;


/* Initialize the subtree pointers */
static gint ett_v5ua              = -1;
static gint ett_v5ua_common_header= -1;
static gint ett_v5ua_parameter    = -1;
static gint ett_v5ua_layer3       = -1;

#define RFC             0x1
#define DRAFT           0x2
      /* Version of IUA */
static int iua_version = RFC;
    /* Variables neccessary for dissection of draft messages */
static int msg_class   = -1;
static int msg_type    = -1;
static int msg_length  = -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
      
static void
dissect_int_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
  guint32 identifier;

  proto_tree_add_item(parameter_tree, hf_link_id, parameter_tvb, INT_IF_ID_LINK_OFFSET, INT_IF_ID_LINK_LENGTH, FALSE);
  identifier = tvb_get_ntohl(parameter_tvb,INT_IF_ID_LINK_OFFSET)>>5;
  proto_item_append_text(parameter_item, "  Link: %d ",identifier);
  
  proto_tree_add_item(parameter_tree, hf_chnl_id, parameter_tvb, INT_IF_ID_CHNL_OFFSET+3, INT_IF_ID_CHNL_LENGTH, FALSE);
  identifier = tvb_get_guint8(parameter_tvb,INT_IF_ID_CHNL_OFFSET+3)&0x1f;
  proto_item_append_text(parameter_item, " Chnl: %d ", identifier);


}
/*----------------------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(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
  guint16 if_id_length;

  if_id_length = tvb_get_ntohs(parameter_tvb, TEXT_IF_ID_LENGTH_OFFSET) - TEXT_IF_ID_HEADER_LENGTH;

  proto_tree_add_item(parameter_tree, hf_text_if_id, parameter_tvb, TEXT_IF_ID_VALUE_OFFSET, if_id_length, FALSE);
  proto_item_append_text(parameter_item, " (0x%.*s)", if_id_length,
                         (const char *)tvb_get_ptr(parameter_tvb, TEXT_IF_ID_VALUE_OFFSET, if_id_length));
}
/*----------------------Text Interface Identifier (RFC)------------------------*/

/*----------------------DLCI & Envelope Function Adress-------------------------*/


/* interpretaion of EFA-values */
static const value_string efa_values[] = {
      { 8175, "ISDN Protocol" },
      { 8176, "PSTN Protocol" },
      { 8177, "CC Protocol" },
      { 8178, "BCC Protocol" },
      { 8179, "PROT Protocol" },
      { 8180, "Link Contol 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)
{
  guint16 efa = 0, offset=0;

  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,  FALSE);
  proto_tree_add_item(parameter_tree, hf_dlci_spare_bit, parameter_tvb, offset,  DLCI_SAPI_LENGTH,  FALSE);
  proto_tree_add_item(parameter_tree, hf_dlci_sapi,      parameter_tvb, offset,  DLCI_SAPI_LENGTH,  FALSE);

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

  /* if SAPI & TEI not set to ZERO, value of EFA must be decode (EFA = 0 -> ISDN protocol)*/
  if(tvb_get_ntohs(parameter_tvb,offset-DLCI_TEI_LENGTH) != 0x01){

        offset += DLCI_TEI_LENGTH;
        efa = tvb_get_ntohs(parameter_tvb, offset);
        /* EFA-Values for ISDN-Protocal. For the "value_string"-function value must set to 8175 */
        if(efa < 8175) efa = 8175;
        /* Reserved values. For the "value_string"-function value must set to 8191 */
        else if ((efa >= 8181) && (efa < 8191)) efa = 8191;
        proto_tree_add_uint_format(parameter_tree, hf_efa,  parameter_tvb, offset, EFA_LENGTH, efa,
                                                "Envelope function address: %s (%u)", val_to_str(efa, efa_values, "unknown EFA"),tvb_get_ntohs(parameter_tvb, offset));
        proto_item_append_text(parameter_item, " (EFA: %s )",val_to_str(efa, efa_values, "unknown EFA-value"));
  }
  /* if SAPI & TEI set to ZERO, EFA also shall be set to ZERO and didn't comply with value for ISDN protocol */
  else{
        proto_tree_add_uint_format(parameter_tree, hf_efa,  parameter_tvb, offset, EFA_LENGTH, efa,
                                                "Envelope function address: 0");
        proto_item_append_text(parameter_item, " (EFA: 0 )");
  }

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

/*----------------------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 idetifier" },
  { MGMT_ERROR_INVALID_SCNV_DRAFT,    "Invalid SCN version" },
  { MGMT_ERROR_INVALID_ALI_DRAFT,     "Invalid Adapiotion 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)
{
  guint16 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, FALSE);
  offset += MGMT_ERROR_CODE_LENGTH ;
  if( tvb_length_remaining(parameter_tvb,offset) > 0 )
        proto_tree_add_item(parameter_tree, hf_info_string, parameter_tvb, offset, msg_length - offset,FALSE);
}
/*----------------------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,                 "Unsuported 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, FALSE);
  proto_item_append_text(parameter_item, " (%s)",
                         val_to_str(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)
{
  guint16 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, FALSE);
  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)
{
  guint16 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, FALSE);
  proto_tree_add_uint_format(parameter_tree, hf_status_id,  parameter_tvb, NTFY_STATUS_IDENT_OFFSET, NTFY_STATUS_IDENT_LENGTH,
                             status_id, "Status identification: %u (%s)", status_id,
                             val_to_str(status_type * 256 * 256 + status_id, status_type_id_values, "unknown"));

  proto_item_append_text(parameter_item, " (%s)",
                         val_to_str(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, FALSE);
  proto_item_append_text(parameter_item, " (%s)",
                      val_to_str(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)
{
  gint length, offset;
  offset = tvb_get_ntohs(parameter_tvb, TEI_STATUS_LENGTH_OFFSET) + 8;
  length = msg_length - offset;
  if(tvb_length_remaining(parameter_tvb, offset) > 0 ){
        proto_tree_add_item(parameter_tree, hf_tei_draft_status, parameter_tvb, offset, TEI_STATUS_LENGTH, FALSE);
        proto_item_append_text(parameter_item, " (%s)",
                                                val_to_str(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(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
  guint16 adaptation_layer_id_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);

  proto_tree_add_item(parameter_tree, hf_adaptation_layer_id, parameter_tvb, PARAMETER_VALUE_OFFSET, adaptation_layer_id_length, FALSE);
  proto_item_append_text(parameter_item, " (%.*s)", adaptation_layer_id_length,
                         (const char *)tvb_get_ptr(parameter_tvb, PARAMETER_VALUE_OFFSET, adaptation_layer_id_length));
}

static void
dissect_scn_protocol_id_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
  guint16 id_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
  proto_tree_add_item(parameter_tree, hf_scn_protocol_id, parameter_tvb, PARAMETER_VALUE_OFFSET, id_length, FALSE);
  proto_item_append_text(parameter_item, " (%.*s)", id_length,
                         (const char *)tvb_get_ptr(parameter_tvb, PARAMETER_VALUE_OFFSET, id_length));
}

/*----------------------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, FALSE);
  proto_item_append_text(parameter_item, " (%s)", val_to_str(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)
{
  guint16 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, FALSE);
  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, FALSE);
  proto_item_append_text(parameter_item, " (%s)",
                         val_to_str(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)
{
  guint16 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 = 1; 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, FALSE);
    proto_tree_add_item(parameter_tree, hf_if_range_end,   parameter_tvb, offset + IF_ID_END_OFFSET,   IF_ID_END_LENGTH,   FALSE);
    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)--------------------*/
/* message types of PSTN */
#define ESTABLISH           0x00
#define ESTABLISH_ACK       0x01
#define SIGNAL              0x02
#define SIGNAL_ACK          0x03
#define DISCONNECT          0x08
#define DISCONNECT_COMPLETE 0x09
#define STATUS_ENQUIRY      0x0c
#define STATUS              0x0d
#define PROTOCOL_PARAMETER  0x0e
/* message types of Control protocol */
#define PORT_CONTROL        0x10
#define PORT_CONTROL_ACK    0x11
#define COMMON_CONTROL      0x12
#define COMMON_CONTROL_ACK  0x13
/* message types of PROT protocol */
#define SWITCH_OVER_REQ     0x18
#define SWITCH_OVER_COM     0x19
#define OS_SWITCH_OVER_COM  0x1a
#define SWITCH_OVER_ACK     0x1b
#define SWITCH_OVER_REJECT  0x1c
#define PROT_PROTOCOL_ERROR 0x1d
#define RESET_SN_COM        0x1e
#define RESET_SN_ACK        0x1f
/* message types of BCC */
#define ALLOCATION             0x20
#define ALLOCATION_COMPLETE    0x21
#define ALLOCATION_REJECT      0x22
#define DE_ALLOCATION          0x23
#define DE_ALLOCATION_COMPLETE 0x24
#define DE_ALLOCATION_REJECT   0x25
#define AUDIT                  0x26
#define AUDIT_COMPLETE         0x27
#define AN_FAULT               0x28
#define AN_FAULT_ACKNOWLEDGE   0x29
#define BCC_PROTOCOL_ERROR     0x2a
/* message types of Link Control protocol */
#define LINK_CONTROL        0x30
#define LINK_CONTROL_ACK    0x31

static const value_string l3_msg_type_values [] = {
      { ESTABLISH,             "Establish" },
      { ESTABLISH_ACK,         "Establish Ack" },
      { SIGNAL,                "Signal" },
      { SIGNAL_ACK,            "Signal Ack" },
      { DISCONNECT,            "Disconnect" },
      { DISCONNECT_COMPLETE,   "Disconnect Complete" },
      { STATUS_ENQUIRY,        "Status Enqueiry" },
      { STATUS,                "Status" },
      { PROTOCOL_PARAMETER,    "Protocol Parameter" },
      { PORT_CONTROL,          "Port Control" },
      { PORT_CONTROL_ACK,      "Port Control Ack" },
      { COMMON_CONTROL,        "Common Control" },
      { COMMON_CONTROL_ACK,    "Common Control Ack" },
      { SWITCH_OVER_REQ,       "Switch-Over Request" },
      { SWITCH_OVER_COM,       "Switch-Over Com" },
      { OS_SWITCH_OVER_COM,    "OS-Switch-Over Com" },
      { SWITCH_OVER_ACK,       "Switch-Over Ack" },
      { SWITCH_OVER_REJECT,    "Switch-Over Reject" },
      { PROT_PROTOCOL_ERROR,   "Protection Protocol Error" },
      { RESET_SN_COM,          "Reset SN Com" },
      { RESET_SN_ACK,          "Reset SN Ack" },
      { ALLOCATION,            "Allocation" },
      { ALLOCATION_COMPLETE,   "Allocation Complete" },
      { ALLOCATION_REJECT,     "Allocation Reject" },
      { DE_ALLOCATION,         "DE Allocation" },
      { DE_ALLOCATION_COMPLETE,"DE Allocation Complete" },
      { DE_ALLOCATION_REJECT,  "DE Allocation Reject" },
      { AUDIT,                 "Audit" },
      { AUDIT_COMPLETE,        "Audit Complete" },
      { AN_FAULT,              "AN Fault" },
      { AN_FAULT_ACKNOWLEDGE,  "AN Fault Ack" },
      { BCC_PROTOCOL_ERROR,    "BCC Protocol Error" },
      { LINK_CONTROL,          "Link Control" },
      { LINK_CONTROL_ACK,      "Link Control Ack" },
      { 0,                     NULL } };

/* PSTN protocol message info elements */
#define PULSE_NOTIFICATION   0xc0
#define LINE_INFORMATION     0x80
#define STATE                0x90
#define AUTO_SIG_SEQUENCE    0xa0
#define SEQUENCE_RESPONSE    0xb0
#define PSTN_SEQUENCE_NUMBER 0x00
#define CADENCED_RINGING     0x01
#define PULSED_SIGNAL        0x02
#define STEADY_SIGNAL        0x03
#define DIGIT_SIGNAL         0x04
#define RECOGNITION_TIME     0x10
#define ENABLE_AUTO_ACK      0x11
#define DISABLE_AUTO_ACK     0x12
#define CAUSE                0x13
#define RESOURCE_UNAVAILABLE 0x14

static const value_string l3_line_info_values [] = {
      { 0x00, "Impedance marker reset" },
      { 0x01, "Impedance marker set" },
      { 0x02, "Low loop impedance" },
      { 0x03, "Anomalous loop impedance" },
      { 0x04, "Anomalous line condition received"},
      { 0,    NULL } };

static const value_string l3_pulse_type_values [] = {
      { 0xff, "Pulsed normal polarity" },
      { 0xfe, "Pulsed reversed polarity" },
      { 0xfd, "Pulsed battery on c-wire" },
      { 0xfc, "Pulsed on hook" },
      { 0xfb, "Pulsed reduced battery" },
      { 0xfa, "Pulsed no battery" },
      { 0xf9, "Initial ring" },
      { 0xf8, "Meter pulse" },
      { 0xf7, "50 Hz pulse" },
      { 0xf6, "Register recall (timed loop open)" },
      { 0xf5, "Pulsed off hook (pulsed loop closed)" },
      { 0xf4, "Pulsed b-wire connected to earth" },
      { 0xf3, "Earth loop pulse" },
      { 0xf2, "Pulsed b-wire connected to battery" },
      { 0xf1, "Pulsed a-wire connected to earth" },
      { 0xf0, "Pulsed a-wire connected to battery" },
      { 0xef, "Pulsed c-wire connected to earth" },
      { 0xee, "Pulsed c-wire disconnected" },
      { 0xed, "Pulsed normal battery" },
      { 0xec, "Pulsed a-wire disconnected" },
      { 0xeb, "Pulsed b-wire disconnected" },
      { 0,    NULL } };

static const value_string l3_suppression_indication_values [] = {
      { 0x0, "No suppression" },
      { 0x1, "Suppression allowed by pre-defined V5.1 SIGNAL msg from LE" },
      { 0x2, "Suppression allowed by pre-defined line signal from TE" },
      { 0x3, "Suppression allowed by pre-defined V5.1 SIGNAL msg from LE or line signal from TE" },
      { 0,   NULL } };

static const value_string l3_ack_request_indication_values [] = {
      { 0x0, "No acknowledgement requested" },
      { 0x1, "Ending acknowledgement requested when finished each pulses" },
      { 0x2, "Ending acknowledgement requested when finished all pulses" },
      { 0x3, "Start of pulse acknowledgement requested" },
      { 0,   NULL } };

static const value_string l3_digit_ack_values [] = {
      { 0x0, "No ending acknowledgement requested" },
      { 0x1, "Ending acknowledgement requested when digit transmission is finished" },
      { 0,   NULL } };

static const value_string l3_state_values [] = {
      { 0x00, "AN0" },
      { 0x01, "AN1" },
      { 0x02, "AN2" },
      { 0x03, "AN3" },
      { 0x04, "AN4" },
      { 0x05, "AN5" },
      { 0x06, "AN6" },
      { 0x07, "AN7" },
      { 0,    NULL } };

static const value_string l3_steady_signal_values [] = {
      { 0x80, "Normal polarity" },
      { 0x81, "Reversed polarity" },
      { 0x82, "Battery on c-wire" },
      { 0x83, "No battery on c-wire" },
      { 0x84, "Off hook (loop closed)" },
      { 0x85, "On hook (loop open)" },
      { 0x86, "Battery on a-wire" },
      { 0x87, "A-wire on earth" },
      { 0x88, "No battery on a-wire" },
      { 0x89, "No batery on b-wire" },
      { 0x8a, "Reduced battery" },
      { 0x8b, "No battery" },
      { 0x8c, "Alternate reduced power / no power" },
      { 0x8d, "Normal battery" },
      { 0x8e, "Stop ringing" },
      { 0x8f, "Start pilot frequency" },
      { 0x90, "Stop pilot frequency" },
      { 0x91, "Low impedance on b-wire" },
      { 0x92, "B-wire connected to earth" },
      { 0x93, "B-wire disconnected from earth" },
      { 0x94, "Battery on b-wire" },
      { 0x95, "Low loop impedance" },
      { 0x96, "High loop impedance" },
      { 0x97, "Anomalous loop impedance" },
      { 0x98, "A-wire disconnected from earth" },
      { 0x99, "C-wire on earth" },
      { 0x9a, "C-wire disconnected from earth" },
      { 0,    NULL } };

static const value_string l3_cause_type_values [] = {
      { 0x00, "Response to STATUS ENQUIRY" },
      { 0x01, "Protocol discriminator error" },
      { 0x03, "L3 address error" },
      { 0x04, "Message type unrecognized" },
      { 0x05, "Out of sequence information element" },
      { 0x06, "Repeated optional information element" },
      { 0x07, "Mandatory information element missing" },
      { 0x08, "Unrecognized information element" },
      { 0x09, "Mandatory information element content error" },
      { 0x0a, "Optional information element content error" },
      { 0x0b, "Message not compatible with path state" },
      { 0x0c, "Repeated mandatory information element" },
      { 0x0d, "Too many information elements" },
      { 0,    NULL } };

/* BCC protocol message info elements */
#define USER_PORT_ID             0x40
#define ISDN_PORT_CHNL_ID        0x41
#define V5_TIME_SLOT_ID          0x42
#define MULTI_SLOT_MAP           0x43
#define BCC_REJECT_CAUSE         0x44
#define BCC_PROTOCOL_ERROR_CAUSE 0x45
#define CONNECTION_INCOMPLETE    0x46

static const value_string l3_reject_cause_type_values [] = {
      { 0x00, "Unspecified" },
      { 0x01, "Access network fault" },
      { 0x02, "Access network blocked (internally)" },
      { 0x03, "Connection already present at the PSTN user port to a different V5 time slot" },
      { 0x04, "Connection already present at the V5 time slot(s) to a different port or ISDN user port time slot(s)" },
      { 0x05, "Connection already present at the ISDN user port time slot(s) to a different V5 time slot(s)" },
      { 0x06, "User port unavailable (blocked)" },
      { 0x07, "De-allocation cannot completeddue to incompatible data content" },
      { 0x08, "De-allocation cannot completeddue to V5 time slot(s) data incompatibility" },
      { 0x09, "De-allocation cannot completeddue to port data incompatibility" },
      { 0x0a, "De-allocation cannot completeddue to user port time slot(s) data incompatibility" },
      { 0x0b, "User port not provisioned" },
      { 0x0c, "Invalid V5 time slot(s) indication(s)" },
      { 0x0d, "Invalid V5 2048 kbit/s link indication" },
      { 0x0e, "Invalid user time slot(s) indication(s)" },
      { 0x0f, "V5 time slot(s) being used as physikal C-channel(s)" },
      { 0x10, "V5 link unavailable (blocked)" },
      { 0,    NULL } };

static const value_string l3_bcc_protocol_error_cause_type_values [] = {
      { 0x01, "Protocol discriminator error" },
      { 0x04, "Message type unrecognized" },
      { 0x05, "Out of sequence information element" },
      { 0x06, "Repeated optional information element" },
      { 0x07, "Mandatory information element missing" },
      { 0x08, "Unrecognized information element" },
      { 0x09, "Mandatory information element content error" },
      { 0x0a, "Optional infromation element content error" },
      { 0x0b, "Message not compatible with the BCC protocol state" },
      { 0x0c, "Repeated mandatory information element" },
      { 0x0d, "Too many information element" },
      { 0x0f, "BCC Reference Number coding error" },
      { 0,    NULL } };

static const value_string l3_connection_incomplete_reason_values [] = {
      { 0x00, "Incomplete normal" },
      { 0x01, "Access network fault" },
      { 0x02, "User port not provisioned" },
      { 0x03, "Invalid V5 time slot identification" },
      { 0x04, "Invalid V5 2048 kbit/s link identification" },
      { 0x05, "Time slot being used as physikal C-channel" },
      { 0,    NULL } };


/* Link control protocol message info elements */
#define LINK_CONTROL_FUNCTION 0x30

static const value_string l3_link_control_function_values [] = {
      { 0x00, "FE-IDReq" },
      { 0x01, "FE-IDAck" },
      { 0x02, "FE-IDRel" },
      { 0x03, "FE-IDRej" },
      { 0x04, "FE301/302 (link unblock)" },
      { 0x05, "FE303/304 (link block)" },
      { 0x06, "FE305 (deferred link block request" },
      { 0x07, "FE306 (non-deferred link block request)" },
      { 0,    NULL } };

/* Protection protocol message info elements */
#define SEQUENCE_NUMBER    0x50
#define C_CHANNEL_ID       0x51
#define PP_REJECTION_CAUSE 0x52
#define PROTOCOL_ERROR     0x53

/* Control protocolmessage info elements  */
#define PERFORMANCE_GRADING      0xe0
#define CP_REJECTION_CAUSE       0xf0
#define CONTROL_FUNCTION_ELEMENT 0x20
#define CONTROL_FUNCTION_ID      0x21
#define VARIANT                  0x22
#define INTERFACE_ID             0x23

static const value_string l3_performance_grading_values [] = {
      { 0x00, "normal grade" },
      { 0x01, "degraded" },
      { 0,    NULL } };

static const value_string l3_cp_rejection_cause_values [] = {
      { 0x00, "variant unknown" },
      { 0x01, "variant known, not ready" },
      { 0x02, "re-provisioning in progress (re-pro)" },
      { 0,    NULL } };

static const value_string l3_control_function_element_values [] = {
      { 0x01, "FE101 (activate access)" },
      { 0x02, "FE102 (activation initiated by user)" },
      { 0x03, "FE103 (DS activated)" },
      { 0x04, "FE104 (access activated)" },
      { 0x05, "FE105 (deactivate access)" },
      { 0x06, "FE106 (access deactivated)" },
      { 0x11, "FE201/202 (unblock)" },
      { 0x13, "FE203/204 (block)" },
      { 0x15, "FE205 (block request)" },
      { 0x16, "FE206 (performance grading)" },
      { 0x17, "FE207 (D-channel block)" },
      { 0x18, "FE208 (D-channel unblock)" },
      { 0,    NULL } };

static const value_string l3_control_function_id_values [] = {
      { 0x00, "Verify re-provisioning" },
      { 0x01, "Ready for re-provisioning" },
      { 0x02, "Not ready for re-provisioning" },
      { 0x03, "Switch-over to new variant" },
      { 0x04, "Re-provisioning started" },
      { 0x05, "Cannot re-provision" },
      { 0x06, "Request variant and interface ID" },
      { 0x07, "Variant and interface ID" },
      { 0x08, "Blocking started" },
      { 0x10, "Restart request" },
      { 0x11, "Restart complete" },
      { 0,    NULL } };

static const value_string l3_info_element_values [] = {
      { PULSE_NOTIFICATION,      "Pulse notification" },
      { LINE_INFORMATION,        "Line information" },
      { STATE,                   "State" },
      { AUTO_SIG_SEQUENCE,       "Autonomous signal sequence" },
      { SEQUENCE_RESPONSE,       "Sequence response" },
      { PSTN_SEQUENCE_NUMBER,    "Sequence number" },
      { CADENCED_RINGING,        "Cadenced ringing" },
      { PULSED_SIGNAL,           "Pulsed signal" },
      { STEADY_SIGNAL,           "Steady signal" },
      { DIGIT_SIGNAL,            "Digit signal" },
      { RECOGNITION_TIME,        "Recognition time" },
      { ENABLE_AUTO_ACK,         "Enable autonomous acknowledge" },
      { DISABLE_AUTO_ACK,        "Disable autonomous acknowledge" },
      { CAUSE,                   "Cause" },
      { RESOURCE_UNAVAILABLE,    "Resource unavailable" },
      { PERFORMANCE_GRADING,     "Performance grading" },
      { CP_REJECTION_CAUSE,      "Rejection cause" },
      { CONTROL_FUNCTION_ELEMENT,"Control function element" },
      { CONTROL_FUNCTION_ID,     "Control function ID" },
      { VARIANT,                 "Variant" },
      { INTERFACE_ID,            "Interface ID" },
      { LINK_CONTROL_FUNCTION,   "Link control funktion" },
      { USER_PORT_ID,            "User port ID" },
      { ISDN_PORT_CHNL_ID,       "ISDN port channel ID" },
      { V5_TIME_SLOT_ID,         "V5 time slot ID" },
      { MULTI_SLOT_MAP,          "Multi slot map" },
      { BCC_REJECT_CAUSE,        "Reject cause" },
      { BCC_PROTOCOL_ERROR_CAUSE,"Protocol error cause" },
      { CONNECTION_INCOMPLETE,   "Connection incomplete" },
      { SEQUENCE_NUMBER,         "Sequence number" },
      { C_CHANNEL_ID,            "C-Channel ID" },
      { PP_REJECTION_CAUSE,      "Rejection cause" },
      { PROTOCOL_ERROR,          "Protocol error" },
      { 0,                       NULL } };


#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 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)
{
  proto_item *layer3_header_item,*layer3_item;
  proto_tree *layer3_header_tree,*layer3_tree;
  guint16 discriminator_offset, address_offset, low_address_offset, msg_type_offset,  info_element_offset;
  guint8  info_element, info_element_length, buffer;

  if(iua_version == DRAFT){
        discriminator_offset = DISCRIMINATOR_OFFSET;
        address_offset       = ADDRESS_OFFSET;
        low_address_offset   = LOW_ADDRESS_OFFSET;
        msg_type_offset      = MSG_TYPE_OFFSET;
        info_element_offset  = INFO_ELEMENT_OFFSET;
  }
  else{
        discriminator_offset = DISCRIMINATOR_OFFSET + PARAMETER_HEADER_LENGTH;
        address_offset       = ADDRESS_OFFSET + PARAMETER_HEADER_LENGTH;
        low_address_offset   = LOW_ADDRESS_OFFSET + PARAMETER_HEADER_LENGTH;
        msg_type_offset      = MSG_TYPE_OFFSET + PARAMETER_HEADER_LENGTH;
        info_element_offset  = INFO_ELEMENT_OFFSET + PARAMETER_HEADER_LENGTH;
  }
  

  if(tvb_get_guint8(layer3_data_tvb, discriminator_offset) == 0x48){
        layer3_header_item   = proto_tree_add_text(v5ua_tree, layer3_data_tvb, discriminator_offset, MSG_HEADER_LENGTH,"Layer3 header");
        layer3_header_tree   = proto_item_add_subtree(layer3_header_item, ett_v5ua_layer3);

        proto_tree_add_item(layer3_header_tree, hf_l3_protocol_discriminator, layer3_data_tvb, discriminator_offset, DISCRIMINATOR_LENGTH, FALSE);
        proto_tree_add_item(layer3_header_tree, hf_l3_adress, layer3_data_tvb, address_offset, ADDRESS_LENGTH, FALSE);
        proto_tree_add_item(layer3_header_tree, hf_l3_low_adress, layer3_data_tvb, low_address_offset, LOW_ADDRESS_LENGTH, FALSE);
        proto_tree_add_item(layer3_header_tree, hf_l3_msg_type, layer3_data_tvb, msg_type_offset, MSG_TYPE_LENGTH, FALSE);
        proto_item_append_text(layer3_header_item, "  Msg Type: %s",
                                      val_to_str(tvb_get_guint8(layer3_data_tvb, msg_type_offset), l3_msg_type_values, "Unknown layer3 msg type"));

        if(tvb_length_remaining(layer3_data_tvb,info_element_offset)){
              layer3_item   = proto_tree_add_text(v5ua_tree, layer3_data_tvb, info_element_offset, tvb_length(layer3_data_tvb)-MSG_HEADER_LENGTH,"Layer3 message");
              layer3_tree   = proto_item_add_subtree(layer3_item, ett_v5ua_layer3);

              info_element_offset  = INFO_ELEMENT_OFFSET;

              while(tvb_length_remaining(layer3_data_tvb,info_element_offset)){
                    info_element = tvb_get_guint8(layer3_data_tvb, info_element_offset);
                    proto_tree_add_item_hidden(layer3_tree, hf_l3_info_element, layer3_data_tvb,info_element_offset,INFO_ELEMENT_LENGTH,FALSE);
                    switch(tvb_get_guint8(layer3_data_tvb, msg_type_offset) & 0xf0){
                    case 0x00:
                          /* Variable Length */
                          if(info_element < 0x80){
                          switch(info_element){
                          case PSTN_SEQUENCE_NUMBER:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_pstn_sequence_number,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case CADENCED_RINGING:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_cad_ringing,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case PULSED_SIGNAL:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_pulse_type,layer3_data_tvb,info_element_offset+2,1,FALSE);/*info_element_length,FALSE); */
                                proto_tree_add_item(layer3_tree,hf_l3_suppression_indicator,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                proto_tree_add_item(layer3_tree,hf_l3_pulse_duration,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                proto_tree_add_item(layer3_tree,hf_l3_ack_request_indicator,layer3_data_tvb,info_element_offset+4,1,FALSE);
                                proto_tree_add_item(layer3_tree,hf_l3_number_of_pulses,layer3_data_tvb,info_element_offset+4,1,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case STEADY_SIGNAL:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_steady_signal,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                proto_item_append_text(layer3_item, "  Steady Signal: %s",
                                                                  val_to_str(tvb_get_guint8(layer3_data_tvb, info_element_offset+2), l3_steady_signal_values, "Unknown Signal"));
                                info_element_offset +=info_element_length+2;
                                break;
                          case DIGIT_SIGNAL:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                buffer = tvb_get_guint8(layer3_data_tvb, info_element_offset+2)>>6;
                                buffer = buffer&0x01;
                                proto_tree_add_uint_format(layer3_tree, hf_l3_digit_ack,layer3_data_tvb,info_element_offset+2,1,buffer,
                                                                              "Digit ack request indication: %s",val_to_str(buffer,l3_digit_ack_values,"unknown"));
                                proto_tree_add_item(layer3_tree,hf_l3_digit_info,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case RECOGNITION_TIME:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                buffer = tvb_get_guint8(layer3_data_tvb,info_element_offset+2)&0x7f;
                                /*Signal = Coding of pulse type*/
                                if(buffer>=0x6b)
                                    proto_tree_add_item(layer3_tree,hf_l3_pulse_type,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                /*Signal = Coding of steady signal type*/
                                else if(buffer<=0x1a)
                                    proto_tree_add_item(layer3_tree,hf_l3_steady_signal,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                proto_tree_add_item(layer3_tree,hf_l3_duration_type,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case ENABLE_AUTO_ACK:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                buffer = tvb_get_guint8(layer3_data_tvb,info_element_offset+2)&0x7f;
                                /*Signal*/
                                if(buffer>=0x6b)
                                    proto_tree_add_item(layer3_tree,hf_l3_pulse_type,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                else if(buffer<=0x1a)
                                    proto_tree_add_item(layer3_tree,hf_l3_steady_signal,layer3_data_tvb,info_element_offset+2,1,FALSE);

                                buffer = tvb_get_guint8(layer3_data_tvb,info_element_offset+3)&0x7f;
                                /*Response*/
                                if(buffer>=0x6b)
                                    proto_tree_add_item(layer3_tree,hf_l3_pulse_type,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                else if(buffer<=0x1a)
                                    proto_tree_add_item(layer3_tree,hf_l3_steady_signal,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                    
                                if(tvb_length_remaining(layer3_data_tvb, info_element_offset+4)){
                                    proto_tree_add_item(layer3_tree,hf_l3_suppression_indicator,layer3_data_tvb,info_element_offset+4,1,FALSE);
                                    proto_tree_add_item(layer3_tree,hf_l3_pulse_duration,layer3_data_tvb,info_element_offset+4,1,FALSE);
                                }
                                if(tvb_length_remaining(layer3_data_tvb, info_element_offset+5)){
                                    proto_tree_add_item(layer3_tree,hf_l3_ack_request_indicator,layer3_data_tvb,info_element_offset+5,1,FALSE);
                                    proto_tree_add_item(layer3_tree,hf_l3_number_of_pulses,layer3_data_tvb,info_element_offset+5,1,FALSE);
                                }
                                info_element_offset +=info_element_length+2;
                                break;
                          case DISABLE_AUTO_ACK:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                buffer = tvb_get_guint8(layer3_data_tvb,info_element_offset+2)&0x7f;
                                if(buffer>=0x6b)
                                    proto_tree_add_item(layer3_tree,hf_l3_pulse_type,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                else if(buffer<=0x1a)
                                    proto_tree_add_item(layer3_tree,hf_l3_steady_signal,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case CAUSE:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_cause_type,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                if(tvb_length_remaining(layer3_data_tvb, info_element_offset+3))
                                proto_tree_add_uint_format(layer3_tree, hf_l3_msg_type,layer3_data_tvb, info_element_offset+3,1,tvb_get_guint8(layer3_data_tvb,info_element_offset+3),
                                                                        "Diagnostic: %s",val_to_str(tvb_get_guint8(layer3_data_tvb,info_element_offset+3),l3_msg_type_values,"unknown"));
                                info_element_offset +=info_element_length+2;
                                break;
                          case RESOURCE_UNAVAILABLE:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_res_unavailable,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          default:
                                info_element_offset += 1;
                                break;
                          }
                          }
                          /* Single Octet */
                          else if(info_element >= 0x80){
                                switch(info_element & 0xf0){
                                case PULSE_NOTIFICATION:
                                      proto_tree_add_item(layer3_tree,hf_l3_pulse_notify,layer3_data_tvb,info_element_offset,1,FALSE);
                                      break;
                                case LINE_INFORMATION:
                                      proto_tree_add_item(layer3_tree,hf_l3_line_info,layer3_data_tvb,info_element_offset,1,FALSE);
                                      break;
                                case STATE:
                                      proto_tree_add_item(layer3_tree,hf_l3_state,layer3_data_tvb,info_element_offset,1,FALSE);
                                      break;
                                case AUTO_SIG_SEQUENCE:
                                      proto_tree_add_item(layer3_tree,hf_l3_auto_signalling_sequence,layer3_data_tvb,info_element_offset,1,FALSE);
                                      break;
                                case SEQUENCE_RESPONSE:
                                      proto_tree_add_item(layer3_tree,hf_l3_sequence_response,layer3_data_tvb,info_element_offset,1,FALSE);
                                      break;
                                default:
                                      break;
                                }
                                info_element_offset += 1;
                          }
                          break;

                    case 0x10:
                          /* Variable Length */
                          if(info_element < 0x80){
                          switch(info_element){
                          case CONTROL_FUNCTION_ELEMENT:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_control_function_element,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case CONTROL_FUNCTION_ID:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_control_function_id,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case VARIANT:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_variant,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case INTERFACE_ID:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_if_id,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case SEQUENCE_NUMBER:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_sequence_number,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case C_CHANNEL_ID:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_v5_link_id,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                proto_tree_add_item(layer3_tree,hf_l3_v5_time_slot,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case PP_REJECTION_CAUSE:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_rejection_cause_type,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case PROTOCOL_ERROR:
                                break;
                          default:
                                info_element_offset += 1;
                                break;
                          }
                          }
                          /* Single Octet */
                          else if(info_element >= 0x80){
                                switch(info_element & 0xf0){
                                case PERFORMANCE_GRADING:
                                      proto_tree_add_item(layer3_tree,hf_l3_performance_grading,layer3_data_tvb,info_element_offset,1,FALSE);
                                      break;
                                case CP_REJECTION_CAUSE:
                                      proto_tree_add_item(layer3_tree,hf_l3_cp_rejection_cause,layer3_data_tvb,info_element_offset,1,FALSE);
                                      break;
                                default:
                                      break;
                                }
                                info_element_offset += 1;
                          }
                          break;

                    case 0x20:
                          /* Variable Length */
                          switch(info_element){
                          case USER_PORT_ID:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                buffer = tvb_get_guint8(layer3_data_tvb,info_element_offset+2)&0x01;
                                if(buffer==0x01){
                                      proto_tree_add_item(layer3_tree,hf_l3_pstn_user_port_id,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                      proto_tree_add_item(layer3_tree,hf_l3_pstn_user_port_id_lower,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                }
                                else if(buffer == 0x00){
                                      proto_tree_add_item(layer3_tree,hf_l3_isdn_user_port_id,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                      proto_tree_add_item(layer3_tree,hf_l3_isdn_user_port_id_lower,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                }
                                info_element_offset +=info_element_length+2;                
                                break;
                          case ISDN_PORT_CHNL_ID:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_isdn_user_port_ts_num,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case V5_TIME_SLOT_ID:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_v5_link_id,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                proto_tree_add_item(layer3_tree,hf_l3_override,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                proto_tree_add_item(layer3_tree,hf_l3_v5_time_slot,layer3_data_tvb,info_element_offset+3,1,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          case MULTI_SLOT_MAP:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_v5_link_id,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                /* add ts upts here */
                                info_element_offset +=info_element_length+2;
                                break;
                          case BCC_REJECT_CAUSE:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_reject_cause_type,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                /* add diagnostic */
                                info_element_offset +=info_element_length+2;
                                break;
                          case BCC_PROTOCOL_ERROR_CAUSE:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_bcc_protocol_error_cause,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                /* add diagnostic */
                                info_element_offset +=info_element_length+2;
                                break;
                          case CONNECTION_INCOMPLETE:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_connection_incomplete_reason,layer3_data_tvb,info_element_offset+2,1,FALSE);
                                info_element_offset +=info_element_length+2;
                                break;
                          default:
                                info_element_offset += 1;
                                break;
                          }
                          break;

                    case 0x30:
                          /* Variable Length */
                          switch(info_element){
                          case LINK_CONTROL_FUNCTION:
                                info_element_length = tvb_get_guint8(layer3_data_tvb,info_element_offset+1);
                                proto_tree_add_item(layer3_tree,hf_l3_link_control_function,layer3_data_tvb,info_element_offset+2,info_element_length,FALSE);
                                info_element_offset += info_element_length+2;
                                break;
                          default:
                                info_element_offset += 1;
                                break;
                          }
                          break;

                    default:
                          info_element_offset += 1;
                          break;
                    }
              }
        }
  }
  else{
        guint16 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(layer3_data_tvb, PARAMETER_VALUE_OFFSET, protocol_data_length, 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)
{
  gint 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, FALSE);
  if(iua_version != DRAFT)
        proto_item_append_text(parameter_item, " (%s)",
                                        val_to_str(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 is in operation" },
  { LINK_STATUS_NON_OPERTIONAL,  "Link is not in operation" },
  { 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, FALSE);
  proto_item_append_text(parameter_item, " (%s)",
                                val_to_str(tvb_get_ntohl(parameter_tvb, LINK_STATUS_OFFSET),link_status_values, "Unknown Link status"));
}
/*----------------------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 to ZERO" },
      { SA_BIT_ID_ONE,     "set to ONE" },
      { SA_BIT_VALUE_SA7,  "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, FALSE);
  proto_tree_add_item(parameter_tree, hf_sa_bit_value, parameter_tvb, SA_BIT_VALUE_OFFSET, SA_BIT_VALUE_LENGTH, FALSE);
  proto_item_append_text(parameter_item, " (%s %s)",
                                val_to_str(tvb_get_ntohs(parameter_tvb, SA_BIT_ID_OFFSET), sa_bit_values, "unknown"),
                                val_to_str(tvb_get_ntohs(parameter_tvb, SA_BIT_VALUE_OFFSET), sa_bit_values, "unknown Bit"));

}
/*----------------------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, FALSE);
  proto_item_append_text(parameter_item, " (%s)",
                                val_to_str(tvb_get_ntohl(parameter_tvb, ERROR_REASON_OFFSET), error_reason_values, "unknown"));
}
/*----------------------Error Indication (RFC)---------------------------------*/

#define INFO_STRING_OFFSET PARAMETER_VALUE_OFFSET

static void
dissect_info_string_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
  guint16 info_string_length;

  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(parameter_tree, hf_info_string, parameter_tvb, INFO_STRING_OFFSET, info_string_length, FALSE);
      proto_item_append_text(parameter_item, " (%.*s)", info_string_length,
                                 (const char *)tvb_get_ptr(parameter_tvb, INFO_STRING_OFFSET, info_string_length));
  }
}

static void
dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
{
  guint16 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, FALSE);
  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 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                               0x05
#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 LINK_STATUS_PARAMETER_TAG                        0x11
#define SA_BIT_STATUS_PARAMETER_TAG                      0x12
#define ERROR_INDICATION_PARAMETER_TAG                   0x13

static const value_string parameter_tag_values[] = {
  { INT_INTERFACE_IDENTIFIER_PARAMETER_TAG,              "V5UA Interface Identifier (int)" },
  { TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG,             "Text Interface Identifier" },
  { INFO_PARAMETER_TAG,                                  "Info" },
  { DLCI_PARAMETER_TAG,                                  "DLCI" },
  { DIAGNOSTIC_INFORMATION_PARAMETER_TAG,                "Diagnostic information" },
  { INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG,    "Integer range interface identifier" },
  { 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,                        "Reason" },
  { TEI_STATUS_PARAMETER_TAG,                            "TEI status" },
  { 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" },
  { 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)
{
  guint16 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_length(parameter_tvb) - length;

  /* create proto_tree stuff */

  switch(iua_version){
  case RFC:
        parameter_item   = proto_tree_add_text(v5ua_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, tvb_length(parameter_tvb),
                                                     val_to_str(tag, parameter_tag_values, "Unknown parameter"));
      parameter_tree   = proto_item_add_subtree(parameter_item, ett_v5ua_parameter);

        /* add tag to the v5ua tree */
      proto_tree_add_item(parameter_tree, hf_parameter_tag, parameter_tvb, PARAMETER_TAG_OFFSET, PARAMETER_TAG_LENGTH, FALSE);
        break;

  case DRAFT:
  default:
        parameter_item   = proto_tree_add_text(v5ua_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, tvb_length(parameter_tvb),
                                                     val_to_str(tag, parameter_tag_draft_values, "Unknown parameter"));
      parameter_tree   = proto_item_add_subtree(parameter_item, ett_v5ua_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, FALSE);
        break;
  
  };

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

  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);

            /* 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){
               guint16 length, offset;
               tvbuff_t *layer3_data_tvb;
               offset = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) + 8;
               length = msg_length - offset;

             if(length > 0){
               if(tvb_get_guint8(parameter_tvb, offset) == 0x48){
                        layer3_data_tvb = tvb_new_subset(parameter_tvb, offset, length, length);
                        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(parameter_tvb, parameter_tree, parameter_item);
      break;
  case TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG:
    if(iua_version == RFC)
            dissect_text_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
      if(iua_version == DRAFT)
            dissect_scn_protocol_id_parameter(parameter_tvb, parameter_tree, parameter_item);
    break;
  case INFO_PARAMETER_TAG:
    dissect_info_string_parameter(parameter_tvb, parameter_tree, parameter_item);
    break;
  case DLCI_PARAMETER_TAG:
    dissect_dlci_parameter(parameter_tvb, parameter_tree, parameter_item);
    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 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, FALSE);
  }
}

/* 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)
{
  gint tag, offset, length, total_length, remaining_length;
  tvbuff_t *parameter_tvb;

  
  offset = 0;
  while((remaining_length = tvb_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 = ADD_PADDING(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(parameters_tvb, offset, total_length, 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,                                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      9

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, "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
      /* 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


      /* message types for ASPSM messages */
#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_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_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

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_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 confimation" },
  { MSG_CLASS_MGMT_MSG_DRAFT * 256 + MGMT_MSG_DRAFT_TYPE_TEI_STATUS_IND,   "TEI status indication" },
  { 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_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 * 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 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;

  guint8 message_class, message_type;

  message_class  = tvb_get_guint8(common_header_tvb, COMMON_HEADER_MSG_CLASS_OFFSET);
  message_type   = tvb_get_guint8(common_header_tvb, COMMON_HEADER_MSG_TYPE_OFFSET);

  /* Add message type into info column */
  if (check_col(pinfo->cinfo, COL_INFO)) {
    col_add_str(pinfo->cinfo, COL_INFO, val_to_str(message_class * 256 + message_type, msg_class_type_values, "UNKNOWN"));
    col_append_str(pinfo->cinfo, COL_INFO, " ");
  }

  if (v5ua_tree) {

        /* create proto_tree stuff */
    common_header_item   = proto_tree_add_text(v5ua_tree, common_header_tvb, COMMON_HEADER_OFFSET, tvb_length(common_header_tvb),"Common Msg-Header");
    common_header_tree   = proto_item_add_subtree(common_header_item, ett_v5ua_common_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, FALSE);
    proto_tree_add_item(common_header_tree, hf_reserved, common_header_tvb, COMMON_HEADER_RESERVED_OFFSET, COMMON_HEADER_RESERVED_LENGTH, FALSE);
    proto_tree_add_item(common_header_tree, hf_msg_class, common_header_tvb, COMMON_HEADER_MSG_CLASS_OFFSET, COMMON_HEADER_MSG_CLASS_LENGTH, FALSE);
    proto_tree_add_uint_format(common_header_tree, hf_msg_type,
                              common_header_tvb, COMMON_HEADER_MSG_TYPE_OFFSET, COMMON_HEADER_MSG_TYPE_LENGTH,
                              message_type, "Message type: %s ( %u )",
                              val_to_str(message_class * 256 + message_type, msg_class_type_values, "reserved"), message_type);
    proto_tree_add_uint(common_header_tree, hf_msg_type_id, common_header_tvb, COMMON_HEADER_MSG_TYPE_OFFSET, COMMON_HEADER_MSG_TYPE_LENGTH,
                              message_class * 256 + 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, FALSE);
    
      /* Add message type to the Common Msg-Header line */
      proto_item_append_text(common_header_item, " (%s)",val_to_str(message_class * 256 + message_type, msg_class_type_values, "Unknown Msg-Type"));
  }
  
  /* 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(tvb, COMMON_HEADER_OFFSET, COMMON_HEADER_LENGTH, COMMON_HEADER_LENGTH);
  dissect_common_header(common_header_tvb, pinfo, v5ua_tree);

  parameters_tvb    = tvb_new_subset(tvb, COMMON_HEADER_LENGTH, -1, -1);
  dissect_parameters(parameters_tvb, pinfo, tree, v5ua_tree);
}
      
      
static void
dissect_v5ua(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{

   gint    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 */
      if (check_col(pinfo->cinfo, COL_PROTOCOL)) 
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "V5UA");
    
/* This field shows up as the "Info" column in the display; you should make
   it, if possible, summarize what's in the packet, so that a user looking
   at the list of packets can tell what type of packet it is. See section 1.5
   for more information. */


      if (check_col(pinfo->cinfo, COL_INFO)) 
            col_clear(pinfo->cinfo, COL_INFO);

   
/* In the interest of speed, if "tree" is NULL, don't do any work not
   necessary to generate protocol tree items. */
      if (tree) {

/* NOTE: The offset and length values in the call to
   "proto_tree_add_item()" define what data bytes to highlight in the hex
   display window when the line in the protocol tree display
   corresponding to that item is selected.

   Supplying a length of -1 is the way to highlight all data from the
   offset to the end of the packet. */

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

      }
      else {
      v5ua_tree=NULL;
      };


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

   remaining_length = tvb_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==0x5){
                        remaining_length = FALSE;
                  }
                  else{
                        one_bit = tvb_get_guint8(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;
            }
            /*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_length_remaining(tvb, offset);
            }
            /* add a notice for the draft version */
            if(iua_version == DRAFT){
                  if (check_col(pinfo->cinfo, COL_PROTOCOL)) 
                        col_set_str(pinfo->cinfo, COL_PROTOCOL, "V5UA (draft)");
            }
   }
 

   /* dissect the message */
  dissect_v5ua_message(tvb, pinfo, tree, v5ua_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_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,
                     "", HFILL } },
            { &hf_reserved,
                  { "Reserved",               "v5ua.reserved",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            { &hf_msg_class,
                  { "Message class",          "v5ua.msg_class",
                     FT_UINT8,    BASE_DEC, VALS(msg_class_values),           0x0,
                     "", HFILL } },
            { &hf_msg_type,
                  { "Message Type",           "v5ua.msg_type",
                     FT_UINT8,    BASE_DEC, NULL,                             0x0,
                     "", HFILL } },
            { &hf_msg_type_id,
                  { "Message Type ID",        "v5ua.msg_type_id",
                     FT_UINT8,    BASE_DEC, VALS(msg_class_type_values),      0x0,
                     "", HFILL } },
            { &hf_msg_length,
                  { "Message length",         "v5ua.msg_length",
               FT_UINT32,   BASE_DEC, NULL,                             0x0,
                     "", HFILL } },
            { &hf_link_id,
                  { "Link Identifier",        "v5ua.link_id",
                     FT_UINT32,   BASE_DEC, NULL,                                               ~0x1f,
                     "", HFILL } },
            { &hf_chnl_id,
                  { "Channel Identifier",     "v5ua.channel_id",
                     FT_UINT8,    BASE_DEC, NULL,                                               0x1f,
                     "", HFILL } },
            { &hf_adaptation_layer_id,
                  { "Adaptation Layer ID",      "v5ua.adaptation_layer_id",
                     FT_STRING,   BASE_NONE,NULL,                                               0x0,
                     "", HFILL } },
            { &hf_text_if_id,
                  { "Text interface identifier","v5ua.text_interface_id",
                     FT_STRING,   BASE_NONE,NULL,                                               0x0,
                     "", HFILL } },
            { &hf_scn_protocol_id,
                  { "SCN Protocol Identifier","v5ua.scn_protocol_id",
                     FT_STRING,   BASE_NONE,NULL,                                               0x0,
                     "", HFILL } },
            { &hf_info_string,
                  { "Info String",            "v5ua.info_string",
                     FT_STRING,   BASE_NONE,NULL,                             0x0,
                     "", HFILL } },
            { &hf_dlci_zero_bit,
                  { "Zero bit",               "v5ua.dlci_zero_bit",
                     FT_BOOLEAN,    8,        NULL,                             0x01,
                     "", HFILL } },
            { &hf_dlci_spare_bit,
                  { "Spare bit",              "v5ua.dlci_spare_bit",
               FT_BOOLEAN,    8,        NULL,                             0x02,
                     "", HFILL } },
            { &hf_dlci_sapi,
                  { "SAPI",                   "v5ua.dlci_sapi",
                     FT_UINT8,      BASE_HEX, NULL,                             0xfc,
                     "", HFILL } },
            { &hf_dlci_one_bit,
                  { "One bit",                "v5ua.dlci_one_bit",
                     FT_BOOLEAN,  8,        NULL,                             0x01,
                     "", HFILL } },
            { &hf_dlci_tei,
                  { "TEI",                    "v5ua.dlci_tei",
                     FT_UINT8,    BASE_HEX, NULL,                             0xfe,
                     "", HFILL } },
            { &hf_efa,
                  { "Envelope Function Address","v5ua.efa",
                     FT_UINT16,   BASE_DEC, VALS(efa_values),                 0x0,
                     "", HFILL } },
            { &hf_spare_efa,
                  { "Envelope Function Address (spare)","v5ua.efa",
                     FT_UINT16,   BASE_DEC, NULL,                             ~7,
                     "", HFILL } },
            { &hf_asp_reason,
                  { "Reason",                 "v5ua.asp_reason",
                     FT_UINT32,   BASE_HEX, VALS(asp_reason_values),          0x0,
                     "", HFILL } },
            { &hf_release_reason,
                  { "Release Reason",         "v5ua.release_reason",
                     FT_UINT32,   BASE_HEX, VALS(release_reason_values),      0x0,
                     "", HFILL } },
            { &hf_tei_status,
                  { "TEI status",             "v5ua.tei_status",
                     FT_UINT32,   BASE_HEX, VALS(tei_status_values),          0x0,
                     "", HFILL } },
            { &hf_tei_draft_status,
                  { "TEI status",             "v5ua.tei_draft_status",
                     FT_UINT32,   BASE_HEX, VALS(tei_draft_status_values),    0x0,
                     "", HFILL } },
        { &hf_link_status,
                  { "Link Status",            "v5ua.link_status",
                     FT_UINT32,   BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            { &hf_sa_bit_id,
                  { "BIT ID",                 "v5ua.sa_bit_id",
                     FT_UINT16,   BASE_HEX, VALS(sa_bit_values),              0x0,
                     "", HFILL } },
            { &hf_sa_bit_value,
                  { "Bit Value",              "v5ua.sa_bit_value",
                     FT_UINT16,   BASE_HEX, VALS(sa_bit_values),              0x0,
                     "", HFILL } },
            { &hf_parameter_tag,
                  { "Parameter Tag",          "v5ua.parameter_tag",
                     FT_UINT16,   BASE_HEX, VALS(parameter_tag_values),       0x0,
                     "", HFILL } },
            { &hf_parameter_tag_draft,
                  { "Parameter Tag",          "v5ua.parameter_tag",
                     FT_UINT16,   BASE_HEX, VALS(parameter_tag_draft_values), 0x0,
                     "", HFILL } },
            { &hf_parameter_length, 
                  { "Parameter length",       "v5ua.parameter_length",
                     FT_UINT16,   BASE_DEC, NULL,                             0x0,
                     "", HFILL } },
            { &hf_parameter_value,
                  { "Parameter value",        "v5ua.parameter_value",
                     FT_BYTES,    BASE_NONE,NULL,                             0x0,
                     "", HFILL } },
            { &hf_parameter_padding,
                  { "Parameter padding",      "v5ua.parameter_padding",
                     FT_BYTES,    BASE_NONE,NULL,                             0x0,
                     "", HFILL } },
            { &hf_diagnostic_info,
                  { "Diagnostic Information", "v5ua.diagnostic_info",
                     FT_BYTES,    BASE_NONE,NULL,                                         0x0,
                     "", HFILL } },
            { &hf_if_range_start,
                  { "Interface range Start",  "v5ua.interface_range_start",
                     FT_UINT32,   BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            { &hf_if_range_end,
                  { "Interface range End",    "v5ua.interface_range_end",
                     FT_UINT32,   BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            { &hf_heartbeat_data,
                  { "Heartbeat data",         "v5ua.heartbeat_data",
               FT_BYTES,    BASE_NONE,NULL,                             0x0,
                     "", HFILL } },
            { &hf_traffic_mode_type,
                  { "Traffic mode type",      "v5ua.traffic_mode_type",
                     FT_UINT32,   BASE_HEX, VALS(traffic_mode_type_values),   0x0,
                     "", HFILL } },
            { &hf_error_code,
            { "Error code",             "v5ua.error_code",
                     FT_UINT32,   BASE_HEX, VALS(error_code_values),          0x0,
                     "", HFILL } },
            { &hf_draft_error_code,
                  { "Error code (draft)",     "v5ua.draft_error_code",
                     FT_UINT32,   BASE_HEX, VALS(draft_error_code_values),    0x0,
                     "", HFILL } },
            { &hf_status_type,
                  { "Status type",            "v5ua.status_type",
                     FT_UINT16,   BASE_DEC, VALS(status_type_values),         0x0,
                     "", HFILL } },
            { &hf_status_id,
                  { "Status identification",  "v5ua.status_id",
                     FT_UINT16,   BASE_DEC, NULL,                             0x0,
                     "", HFILL } },
            { &hf_error_reason,
                  { "Error Reason",           "v5ua.error_reason",
                     FT_UINT32,   BASE_HEX, VALS(error_reason_values),        0x0,
                     "", HFILL } },

                     
            /* header fields for layer 3 content*/
            { &hf_l3_protocol_discriminator,
                  { "Protocol Discriminator", "v5ua.l3_protocol_disc",
               FT_UINT8,    BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            { &hf_l3_adress,
                  { "Layer3 adress",         "v5ua.l3_adress",
                     FT_UINT8,    BASE_HEX, NULL,                             0xfe,
                     "", HFILL } },
            { &hf_l3_low_adress,
                  { "Layer3 low adress",     "v5ua.l3_low_adress",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            {&hf_l3_msg_type,
                  { "Layer3 message type",   "v5ua.l3_msg_type",
                     FT_UINT8,    BASE_HEX, VALS(l3_msg_type_values),         0x0,
                     "", HFILL } },
            {&hf_l3_info_element,
                  { "Layer3 information element",   "v5ua.l3_info_element",
                     FT_UINT8,    BASE_HEX, VALS(l3_info_element_values),     0x0,
                     "", HFILL } },
            {&hf_l3_line_info,
                  { "Line_Information",      "v5ua.l3_line_info",
                     FT_UINT8,    BASE_HEX, VALS(l3_line_info_values),        0x0f,
                     "", HFILL } },
            {&hf_l3_cad_ringing,
                  {"Cadenced ringing type",  "v5ua.l3_cad_ringing",
                     FT_UINT8,    BASE_HEX, NULL,                             0x7f,
                     "", HFILL } },
            {&hf_l3_pulse_type,
                  { "Pulse Type",            "v5ua.l3_pulse_type",
                     FT_UINT8,    BASE_HEX, VALS(l3_pulse_type_values),       0x0,
                     "", HFILL } },
            {&hf_l3_suppression_indicator,
                  { "Suppression indicator",  "v5ua.l3_suppression_indicator",
                     FT_UINT8,    BASE_HEX, VALS(l3_suppression_indication_values),0x60,
                     "", HFILL } },
            {&hf_l3_pulse_duration,
                  { "Pulse duration type",   "v5ua.l3_pulse_duration",
                     FT_UINT8,    BASE_HEX, NULL,                             0x1f,
                     "", HFILL } },
            {&hf_l3_ack_request_indicator,
                  { "Ack request indicator",    "v5ua.l3_ack_request_indicator",
                     FT_UINT8,    BASE_HEX, VALS(l3_ack_request_indication_values),0x60,
                     "", HFILL } },
            {&hf_l3_number_of_pulses,
                  { "Number of pulses",      "v5ua.l3_number_of_pulses",
                     FT_UINT8,    BASE_DEC, NULL,                             0x1f,
                     "", HFILL } },
            {&hf_l3_steady_signal,
                  { "Steady Signal",         "v5ua.l3_steady_signal",
                     FT_UINT8,    BASE_HEX, VALS(l3_steady_signal_values),    0x0,
                     "", HFILL } },
            {&hf_l3_auto_signalling_sequence,
                  { "Autonomous signalling sequence","v5ua.l3_auto_signalling_sequence",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0f,
                     "", HFILL } },
            {&hf_l3_sequence_number,
                  { "Sequence number",    "v5ua.l3_sequence_number",
                     FT_UINT8,    BASE_HEX, NULL,                             0x7f,
                     "", HFILL } },
            {&hf_l3_pulse_notify,
                  { "Pulse notification",    "v5ua.l3_pulse_notification",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            {&hf_l3_sequence_response,
                  { "Sequence response",    "v5ua.l3_sequence_response",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0f,
                     "", HFILL } },
            {&hf_l3_digit_ack,
                  { "Digit ack request indication","v5ua.l3_digit_ack",
                     FT_UINT8,    BASE_HEX, VALS(l3_digit_ack_values),        0x40,
                     "", HFILL } },
            {&hf_l3_digit_info,
                  { "Digit information",    "v5ua.l3_digit_info",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0f,
                     "", HFILL } },
            {&hf_l3_res_unavailable,
                  { "Resource unavailable", "v5ua.l3_res_unavailable",
                     FT_STRING,   BASE_NONE,NULL,                             0x0,
                     "", HFILL } },
            {&hf_l3_state,
                  { "PSTN FSM state",       "v5ua.l3_state",
                     FT_UINT8,    BASE_HEX, VALS(l3_state_values),            0x0f,
                     "", HFILL } },
            {&hf_l3_cause_type,
                  { "Cause type",           "v5ua.l3_cause_type",
                     FT_UINT8,    BASE_HEX, VALS(l3_cause_type_values),       0x7f,
                     "", HFILL } },
            {&hf_l3_link_control_function,
                  { "Link control function","v5ua.l3_link_control_function",
                     FT_UINT8,    BASE_HEX, VALS(l3_link_control_function_values),0x7f,
                     "", HFILL } },
            {&hf_l3_pstn_user_port_id,
                  { "PSTN User Port identification Value","v5ua.l3_pstn_user_port_id",
                     FT_UINT8,    BASE_HEX, NULL,                             0xfe,
                     "", HFILL } },
            {&hf_l3_pstn_user_port_id_lower,
                  { "PSTN User Port Identification Value (lower)","v5ua.l3_pstn_user_port_id_lower",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            {&hf_l3_isdn_user_port_id,
                  { "ISDN User Port Identification Value","v5ua.l3_isdn_user_port_id",
                     FT_UINT8,    BASE_HEX, NULL,                             0xfc,
                     "", HFILL } },
            {&hf_l3_isdn_user_port_id_lower,
                  { "ISDN User Port Identification Value (lower)","v5ua.l3_user_port_id_lower",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0fe,
                     "", HFILL } },
            {&hf_l3_isdn_user_port_ts_num,
                  { "ISDN user port time slot number","v5ua.l3_isdn_user_port_ts_num",
                     FT_UINT8,    BASE_HEX, NULL,                             0x1f,
                     "", HFILL } },
            {&hf_l3_override,
                  { "Override",    "v5ua.l3_override", 
                     FT_BOOLEAN,  8,        NULL,                             0x20,
                     "", HFILL } },
            {&hf_l3_v5_link_id,
                  { "V5 2048 kbit/s Link Identifier",    "v5ua.l3_link_id",
                     FT_UINT8,    BASE_HEX, NULL,                             0x0,
                     "", HFILL } },
            {&hf_l3_v5_time_slot,
                  { "V5 Time Slot Number",    "v5ua.l3_v5_time_slot",
                     FT_UINT8,    BASE_DEC, NULL,                             0x1f,
                     "", HFILL } },
            {&hf_l3_reject_cause_type,
                  { "Reject cause type",    "v5ua.l3_reject_cause_type",
                     FT_UINT8,    BASE_HEX, VALS(l3_reject_cause_type_values),0x7f,
                     "", HFILL } },
            {&hf_l3_bcc_protocol_error_cause,
                  { "BCC Protocol error cause type",    "v5ua.l3_bcc_protocol_cause",
                     FT_UINT8,    BASE_HEX, VALS(l3_bcc_protocol_error_cause_type_values),0x7f,
                     "", HFILL } },
            {&hf_l3_connection_incomplete_reason,
                  { "Reason",    "v5ua.l3_connection_incomplete_reason",
                     FT_UINT8,    BASE_HEX, VALS(l3_connection_incomplete_reason_values), 0x0,
                     "", HFILL } },
            {&hf_l3_control_function_element,
                  { "Control function element",    "v5ua.l3_control_function_element",
                     FT_UINT8,    BASE_HEX, VALS(l3_control_function_element_values),     0x7f,
                     "", HFILL } },
            {&hf_l3_control_function_id,
                  { "Control function ID",    "v5ua.l3_control_function",
                     FT_UINT8,    BASE_HEX, VALS(l3_control_function_id_values),          0x7f,
                     "", HFILL } },
            {&hf_l3_variant,
                  { "Variant",    "v5ua.l3_variant",
                     FT_UINT8,    BASE_DEC, NULL,                                         0x0,
                     "", HFILL } },
            {&hf_l3_if_id,
                  { "Interface ID",    "v5ua.l3_interface_id",
                     FT_UINT32,   BASE_HEX, NULL,                                         0x0,
                     "", HFILL } },
            {&hf_l3_performance_grading,
                  { "Performance grading",    "v5ua.l3_performance_grading",
                     FT_UINT8,    BASE_HEX, VALS(l3_performance_grading_values),          0x0f,
                     "", HFILL } },
            {&hf_l3_cp_rejection_cause,
                  { "Rejection cause",    "v5ua.l3_cp_rejection_cause",
                     FT_UINT8,    BASE_HEX, VALS(l3_cp_rejection_cause_values),           0x0f,
                     "", HFILL } },
            {&hf_l3_pstn_sequence_number,
                  { "Sequence number",    "v5ua.l3_pstn_sequence_number",
                     FT_UINT8,    BASE_HEX, NULL,                                         0x7f,
                     "", HFILL } },
            {&hf_l3_duration_type,
                  { "Duration Type",    "v5ua.l3_duration_type",
                     FT_UINT8,    BASE_HEX, NULL,                                         0x3f,
                     "", HFILL } },

            };

/* Setup protocol subtree array */
      static gint *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));
}


/* In RFC specification the SCTP registered User Port Number Assignment for V5UA is 5675 */
/* #define SCTP_PORT_V5UA      5675 */

#define SCTP_PORT_V5UA      10001

void
proto_reg_handoff_v5ua(void)
{
      dissector_handle_t v5ua_handle;

      v5ua_handle = create_dissector_handle(dissect_v5ua, proto_v5ua);
    q931_handle = find_dissector("q931");

      dissector_add("sctp.port", SCTP_PORT_V5UA, v5ua_handle);
      dissector_add("sctp.ppi",  V5UA_PAYLOAD_PROTOCOL_ID, v5ua_handle);
}


/* Start the functions we need for the plugin stuff */

#ifndef ENABLE_STATIC

G_MODULE_EXPORT void
plugin_register(void)
{
    /* register the new protocol, protocol fields, and subtrees */
    if (proto_v5ua == -1) { /* execute protocol initialization only once */
      proto_register_v5ua();
    }
}

G_MODULE_EXPORT void
plugin_reg_handoff(void){
    proto_reg_handoff_v5ua();
}

#endif

/* End the functions we need for plugin stuff */

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