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packet-ansi_637.c
/* packet-ansi_637.c
 * Routines for ANSI IS-637-A (SMS) dissection
 *
 * Copyright 2003, Michael Lum <mlum [AT] telostech.com>
 * In association with Telos Technology Inc.
 *
 * Title          3GPP2             Other
 *
 *   Short Message Service
 *                3GPP2 C.S0015-0         TIA/EIA-637-A
 *
 * $Id: packet-ansi_637.c 28488 2009-05-26 16:01:12Z wmeier $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * 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 <stdio.h>
/* #include <stdlib.h> */
#include <gmodule.h>

#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif

#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif

#include <string.h>

#include "epan/packet.h"
#include "epan/emem.h"


static const char *ansi_proto_name_tele = "ANSI IS-637-A (SMS) Teleservice Layer";
static const char *ansi_proto_name_trans = "ANSI IS-637-A (SMS) Transport Layer";
static const char *ansi_proto_name_short = "IS-637-A";

static const value_string ansi_srvc_cat_strings[] = {
    { 0x0000,     "Unknown or unspecified" },
    { 0x0001,     "Emergency Broadcasts" },
    { 0x0002,     "Administrative" },
    { 0x0003,     "Maintenance" },
    { 0x0004,     "General News - Local" },
    { 0x0005,     "General News - Regional" },
    { 0x0006,     "General News - National" },
    { 0x0007,     "General News - International" },
    { 0x0008,     "Business/Financial News - Local" },
    { 0x0009,     "Business/Financial News - Regional" },
    { 0x000A,     "Business/Financial News - National" },
    { 0x000B,     "Business/Financial News - International" },
    { 0x000C,     "Sports News - Local" },
    { 0x000D,     "Sports News - Regional" },
    { 0x000E,     "Sports News - National" },
    { 0x000F,     "Sports News - International" },
    { 0x0010,     "Entertainment News - Local" },
    { 0x0011,     "Entertainment News - Regional" },
    { 0x0012,     "Entertainment News - National" },
    { 0x0013,     "Entertainment News - International" },
    { 0x0014,     "Local Weather" },
    { 0x0015,     "Area Traffic Reports" },
    { 0x0016,     "Local Airport Flight Schedules" },
    { 0x0017,     "Restaurants" },
    { 0x0018,     "Lodgings" },
    { 0x0019,     "Retail Directory" },
    { 0x001A,     "Advertisements" },
    { 0x001B,     "Stock Quotes" },
    { 0x001C,     "Employment Opportunities" },
    { 0x001D,     "Medical/Health/Hospitals" },
    { 0x001E,     "Technology News" },
    { 0x001F,     "Multi-category" },
    { 0, NULL },
};

static const value_string ansi_tele_msg_type_strings[] = {
    { 1,    "Deliver (mobile-terminated only)" },
    { 2,    "Submit (mobile-originated only)" },
    { 3,    "Cancellation (mobile-originated only)" },
    { 4,    "Delivery Acknowledgement (mobile-terminated only)" },
    { 5,    "User Acknowledgement (either direction)" },
    { 0, NULL },
    };

static const value_string ansi_tele_msg_status_strings[] = {
    {0x00,"Message accepted"},
    {0x01,"Message deposited to Internet"},
    {0x02,"Message delivered"},
    {0x03,"Message cancelled"},
    {0x84,"Network congestion"},
    {0x85,"Network error"},
    {0x9f,"Unknown error"},
    {0xc4,"Network congestion"},
    {0xc5,"Network error"},
    {0xc6,"Cancel failed"},
    {0xc7,"Blocked destination"},
    {0xc8,"Text too long"},
    {0xc9,"Duplicate message"},
    {0xca,"Invalid destination"},
    {0xcd,"Message expired"},
    {0xdf,"Unknown error"},
    { 0, NULL }
};

static const value_string ansi_tele_id_strings[] = {
    { 1,    "Reserved for maintenance" },
    { 4096, "AMPS Extended Protocol Enhanced Services" },
    { 4097, "CDMA Cellular Paging Teleservice" },
    { 4098, "CDMA Cellular Messaging Teleservice" },
    { 4099, "CDMA Voice Mail Notification" },
    { 4100, "CDMA Wireless Application Protocol (WAP)" },
    { 4101, "CDMA Wireless Enhanced Messaging Teleservice (WEMT)" },
    { 65535,      "(Reserved) Being used for Broadcast" },
    { 0, NULL },

};

static const value_string ansi_tele_param_strings[] = {
    { 0x00, "Message Identifier" },
    { 0x01, "User Data" },
    { 0x02, "User Response Code" },
    { 0x03, "Message Center Time Stamp" },
    { 0x04, "Validity Period - Absolute" },
    { 0x05, "Validity Period - Relative" },
    { 0x06, "Deferred Delivery Time - Absolute" },
    { 0x07, "Deferred Delivery Time - Relative" },
    { 0x08, "Priority Indicator" },
    { 0x09, "Privacy Indicator" },
    { 0x0a, "Reply Option" },
    { 0x0b, "Number of Messages" },
    { 0x0c, "Alert on Message Delivery" },
    { 0x0d, "Language Indicator" },
    { 0x0e, "Call-Back Number" },
    { 0x0f, "Message Display Mode" },
    { 0x10, "Multiple Encoding User Data" },
    { 0x14, "Message Status" },
    { 0, NULL },
};

#define     ANSI_TRANS_MSG_TYPE_BROADCAST 1

static const value_string ansi_trans_msg_type_strings[] = {
    { 0,    "Point-to-Point" },
    { 1,    "Broadcast" },
    { 2,    "Acknowledge" },
    { 0, NULL },
};

static const value_string ansi_trans_param_strings[] = {
    { 0x00, "Teleservice Identifier" },
    { 0x01, "Service Category" },
    { 0x02, "Originating Address" },
    { 0x03, "Originating Subaddress" },
    { 0x04, "Destination Address" },
    { 0x05, "Destination Subaddress" },
    { 0x06, "Bearer Reply Option" },
    { 0x07, "Cause Codes" },
    { 0x08, "Bearer Data" },
    { 0, NULL },
};

/*
 * from Table 2.7.1.3.2.4-4. Representation of DTMF Digits
 * 3GPP2 C.S0005-C (IS-2000 aka cdma2000)
 */
static unsigned char air_digits[] = {
  /*  0   1   2   3   4   5   6   7   8   9   a   b   c   d   e */
     '?','1','2','3','4','5','6','7','8','9','0','*','#','?','?'
};

/* Initialize the protocol and registered fields */
static int proto_ansi_637_tele = -1;
static int proto_ansi_637_trans = -1;
static int hf_ansi_637_tele_length = -1;
static int hf_ansi_637_trans_length = -1;
static int hf_ansi_637_trans_bin_addr = -1;
static int hf_ansi_637_tele_msg_type = -1;
static int hf_ansi_637_tele_msg_id = -1;
static int hf_ansi_637_tele_msg_status = -1;
static int hf_ansi_637_tele_msg_rsvd = -1;
static int hf_ansi_637_tele_subparam_id = -1;
static int hf_ansi_637_trans_msg_type = -1;
static int hf_ansi_637_trans_param_id = -1;

/* Initialize the subtree pointers */
static gint ett_ansi_637_tele = -1;
static gint ett_ansi_637_trans = -1;
static gint ett_params = -1;

static guint32 ansi_637_trans_tele_id;
static char ansi_637_bigbuf[1024];
static char gsm_637_bigbuf[1024];
static char ia5_637_bigbuf[1024];
/* static dissector_handle_t data_handle; */
static dissector_table_t tele_dissector_table;
static packet_info *g_pinfo;
static proto_tree *g_tree;

/* FUNCTIONS */
#define GN_CHAR_ALPHABET_SIZE 128

#define GN_CHAR_ESCAPE 0x1b

static gunichar gsm_default_alphabet[GN_CHAR_ALPHABET_SIZE] = {

    /* ETSI GSM 03.38, version 6.0.1, section 6.2.1; Default alphabet */
    /* Fixed to use unicode */
    /* Characters in hex position 10, [12 to 1a] and 24 are not present on
       latin1 charset, so we cannot reproduce on the screen, however they are
       greek symbol not present even on my Nokia */

    '@',  0xa3, '$' , 0xa5, 0xe8, 0xe9, 0xf9, 0xec,
    0xf2, 0xc7, '\n', 0xd8, 0xf8, '\r', 0xc5, 0xe5,
   0x394, '_', 0x3a6,0x393,0x39b,0x3a9,0x3a0,0x3a8,
   0x3a3,0x398,0x39e, 0xa0, 0xc6, 0xe6, 0xdf, 0xc9,
    ' ',  '!',  '\"', '#',  0xa4,  '%',  '&',  '\'',
    '(',  ')',  '*',  '+',  ',',  '-',  '.',  '/',
    '0',  '1',  '2',  '3',  '4',  '5',  '6',  '7',
    '8',  '9',  ':',  ';',  '<',  '=',  '>',  '?',
    0xa1, 'A',  'B',  'C',  'D',  'E',  'F',  'G',
    'H',  'I',  'J',  'K',  'L',  'M',  'N',  'O',
    'P',  'Q',  'R',  'S',  'T',  'U',  'V',  'W',
    'X',  'Y',  'Z',  0xc4, 0xd6, 0xd1, 0xdc, 0xa7,
    0xbf, 'a',  'b',  'c',  'd',  'e',  'f',  'g',
    'h',  'i',  'j',  'k',  'l',  'm',  'n',  'o',
    'p',  'q',  'r',  's',  't',  'u',  'v',  'w',
    'x',  'y',  'z',  0xe4, 0xf6, 0xf1, 0xfc, 0xe0
};


static gunichar IA5_default_alphabet[GN_CHAR_ALPHABET_SIZE] = {

    /*ITU-T recommendation T.50 specifies International Reference Alphabet 5 (IA5) */

    '?', '?', '?', '?', '?', '?', '?', '?',
    '?', '?', '?', '?', '?', '?', '?', '?',
    '?', '?', '?', '?', '?', '?', '?', '?',
    '?', '?', '?', '?', '?', '?', '?', '?',
    ' ', '!', '\"','#', '$', '%', '&', '\'',
    '(', ')', '*', '+', ',', '-', '.', '/',
    '0', '1', '2', '3', '4', '5', '6', '7',
    '8', '9', ':', ';', '<', '=', '>', '?',
    '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
    'H',  'I',  'J',  'K',  'L',  'M',  'N',  'O',
    'P',  'Q',  'R',  'S',  'T',  'U',  'V',  'W',
    'X',  'Y',  'Z',  '[',  '\\',  ']',  '^',  '_',
    '`', 'a',  'b',  'c',  'd',  'e',  'f',  'g',
    'h',  'i',  'j',  'k',  'l',  'm',  'n',  'o',
    'p',  'q',  'r',  's',  't',  'u',  'v',  'w',
    'x',  'y',  'z',  '{',  '|',  '}',  '~',  '?'
};

static gboolean
char_is_escape(unsigned char value)
{
    return (value == GN_CHAR_ESCAPE);
}

static gunichar
char_def_alphabet_ext_decode(unsigned char value)
{
    switch (value)
    {
    case 0x0a: return 0x0c; /* form feed */
    case 0x14: return '^';
    case 0x28: return '{';
    case 0x29: return '}';
    case 0x2f: return '\\';
    case 0x3c: return '[';
    case 0x3d: return '~';
    case 0x3e: return ']';
    case 0x40: return '|';
    case 0x65: return 0x20ac; /* euro */
    default: return '?'; /* invalid character */
    }
}

static gunichar 
char_def_alphabet_decode(unsigned char value)
{
    if (value < GN_CHAR_ALPHABET_SIZE)
    {
      return gsm_default_alphabet[value];
    }
    else
    {
      return '?';
    }
}

static void
gsm_sms_char_7bit_ascii_decode(unsigned char * dest, const unsigned char* src, int len)
{
    int i, j;
    gunichar buf;


    for (i = 0, j = 0; j < len;  j++)
    {
      if (char_is_escape(src[j])) {
          buf = char_def_alphabet_ext_decode(src[++j]);
          i += g_unichar_to_utf8(buf,&(dest[i]));
      }
      else {
          buf = char_def_alphabet_decode(src[j]);
          i += g_unichar_to_utf8(buf,&(dest[i]));
      }
    }
    dest[i]=0;
    return;
}



static gunichar 
char_def_ia5_alphabet_decode(unsigned char value)
{
    if (value < GN_CHAR_ALPHABET_SIZE)
    {
            return IA5_default_alphabet[value];
    }
    else
    {
            return '?';
    }
}

static void
IA5_7BIT_decode(unsigned char * dest, const unsigned char* src, int len)
{
    int i, j;
    gunichar buf;


    for (i = 0, j = 0; j < len;  j++)
    {
          buf = char_def_ia5_alphabet_decode(src[j]);
          i += g_unichar_to_utf8(buf,&(dest[i]));
    }
    dest[i]=0;
    return;
}


static int
decode_7_bits(tvbuff_t *tvb, guint32 *offset, guint8 num_fields, guint8 *last_oct, guint8 *last_bit, gchar *buf)
{
    guint8  oct, oct2, bit;
    /* guint32    saved_offset; */
    guint32 i;


    if (num_fields == 0)
    {
            return 0;
    }

    /* saved_offset = *offset; */
    oct = oct2 = *last_oct;
    bit = *last_bit;

    if (bit == 1)
    {
      oct2 = tvb_get_guint8(tvb, *offset);
      (*offset)++;
    }

    for (i=0; i < num_fields; i++)
    {
      if (bit != 1)
      {
          oct = oct2;

          /*
           * cannot grab an octet if we are getting
           * the last field and bit is 7 or 8
           * because there may not be another octet
           */
          if (((i + 1) != num_fields) ||
            ((bit != 7) && (bit != 8)))
          {
            oct2 = tvb_get_guint8(tvb, *offset);
            (*offset)++;
          }
      }

      switch (bit)
      {
      case 1:
          buf[i] = ((oct & 0x01) << 6) | ((oct2 & 0xfc) >> 2);
          break;

      case 2:
          buf[i] = ((oct & 0x03) << 5) | ((oct2 & 0xf8) >> 3);
          break;

      case 3:
          buf[i] = ((oct & 0x07) << 4) | ((oct2 & 0xf0) >> 4);
          break;

      case 4:
          buf[i] = ((oct & 0x0f) << 3) | ((oct2 & 0xe0) >> 5);
          break;

      case 5:
          buf[i] = ((oct & 0x1f) << 2) | ((oct2 & 0xc0) >> 6);
          break;

      case 6:
          buf[i] = ((oct & 0x3f) << 1) | ((oct2 & 0x80) >> 7);
          break;

      case 7:
          buf[i] = oct & 0x7f;
          break;

      case 8:
          buf[i] = (oct & 0xfe) >> 1;
          break;
      }

      bit = (bit % 8) + 1;
    }

    buf[i] = '\0';
    *last_bit = bit;
    *last_oct = (bit == 1) ? oct : oct2;
      return i;
}

/* PARAM FUNCTIONS */

#define     EXTRANEOUS_DATA_CHECK(edc_len, edc_max_len) \
    if ((edc_len) > (edc_max_len)) \
    { \
      proto_tree_add_text(tree, tvb, offset, \
          (edc_len) - (edc_max_len), "Extraneous Data"); \
    }

#define     SHORT_DATA_CHECK(sdc_len, sdc_min_len) \
    if ((sdc_len) < (sdc_min_len)) \
    { \
      proto_tree_add_text(tree, tvb, offset, \
          (sdc_len), "Short Data (?)"); \
      return; \
    }

#define     EXACT_DATA_CHECK(edc_len, edc_eq_len) \
    if ((edc_len) != (edc_eq_len)) \
    { \
      proto_tree_add_text(tree, tvb, offset, \
          (edc_len), "Unexpected Data Length"); \
      return; \
    }

static void
tele_param_msg_id(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint32 octs;

    EXACT_DATA_CHECK(len, 3);

    octs = tvb_get_ntoh24(tvb, offset);

    proto_tree_add_uint(tree, hf_ansi_637_tele_msg_type,
      tvb, offset, 3, octs);

    proto_tree_add_uint(tree, hf_ansi_637_tele_msg_id,
      tvb, offset, 3, octs);

    proto_tree_add_uint(tree, hf_ansi_637_tele_msg_rsvd,
      tvb, offset, 3, octs);
}

/* Adamek Jan - IS637C Message status decoding procedure */
static void
tele_param_msg_status(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    /* Declare some variables */

    guint8  oct;
    guint8  error_class;
    guint8  msg_status_code;
    const gchar *str = NULL;

    /* Chceck if the exact length */  
    EXACT_DATA_CHECK(len, 1);
   
    /* get the status octet? */

    oct = tvb_get_guint8(tvb, offset);
   

    /* error class filter */
    proto_tree_add_item(tree, hf_ansi_637_tele_msg_status,tvb, offset, 1, FALSE);

    /*error class filter end */


/*error class */

    error_class = ((oct & 0xc0) >> 6);
    switch (error_class)
    {
    case 0x00: str = "No Error";break;
    case 0x01: str = "Reserved";break;
    case 0x02: str = "Temporary Condition";break;
    case 0x03: str = "Permanent Condition";break;
    default: str = "Reserved";break;
    }
    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xc0, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
                        "%s :  Erorr Class: %s",
                        ansi_637_bigbuf,
                        str);
      

       
    msg_status_code = (oct & 0x3f);

    if (error_class == 0x00){
      switch (msg_status_code)
      {
      case 0x00: str = "Message accepted";break;
        case 0x01: str = "Message deposited to internet";break;
        case 0x02: str = "Message delivered";break;
        case 0x03: str = "Message cancelled";break;
        default: str = "Reserved";break;
        }
      other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
                            "%s :  Message status code: %s",
                            ansi_637_bigbuf,
                            str);
    }

/*error message status */
    if (error_class == 0x02){
        switch (msg_status_code)
        {
        case 0x04: str = "Network congestion";break;
        case 0x05: str = "Network error";break;
        case 0x1f: str = "Unknown error";break;
        default: str = "Reserved";break;
        }
        other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
        proto_tree_add_text(tree, tvb, offset, 1,
                            "%s :  Message status code: %s",
                            ansi_637_bigbuf,
                            str);   
    }
  
    if (error_class == 0x03){
        switch (msg_status_code)
        {
        case 0x04: str = "Network congestion";break;
        case 0x05: str = "Network error";break;
        case 0x06: str = "Cancel failed";break;
        case 0x07: str = "Blocked destination";break;
        case 0x08: str = "Text too long";break;
        case 0x09: str = "Duplicate message";break;
        case 0x0a: str = "Invalid destination";break;
        case 0x0d: str = "Message expired";break;
        case 0x1f: str = "Unknown error";break;
        default: str = "Reserved";break;
        }
        other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
        proto_tree_add_text(tree, tvb, offset, 1,
                            "%s :  Message status code: %s",
                            ansi_637_bigbuf,
                            str);
    }
}


static void
tele_param_user_data(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct, oct2;
    guint8  encoding;
    guint8  msg_type;
    guint8  num_fields;
    guint8  used;
    guint8  bit;
    guint32 required_octs;
    guint32 saved_offset;
    guint32 i , out_len;
    const gchar   *str = NULL;

    /*add more translation UCS  , IA5 , latin ,  latin \ hebrew ,gsm 7BIT*/ 
    proto_item *ucs2_item;
    gchar *utf8_text = NULL;
    GIConv cd;
    GError *l_conv_error = NULL;

    SHORT_DATA_CHECK(len, 2);

    /*
     * message encoding
     */
    oct = tvb_get_guint8(tvb, offset);
    oct2 = 0;
    msg_type = 0;
    used = 0;

    encoding = ((oct & 0xf8) >> 3);
    switch (encoding)
    {
    case 0x00: str = "Octet, unspecified"; break;
    case 0x01: str = "Extended Protocol Message";
      oct2 = tvb_get_guint8(tvb, offset+1);
      msg_type = ((oct & 0x07) << 5) | ((oct2 & 0xf8) >> 3);
      break;
    case 0x02: str = "7-bit ASCII"; break;
    case 0x03: str = "IA5"; break;
    case 0x04: str = "UNICODE"; break;
    case 0x05: str = "Shift-JIS"; break;
    case 0x06: str = "Korean"; break;
    case 0x07: str = "Latin/Hebrew"; break;
    case 0x08: str = "Latin"; break;
    case 0x09: str = "GSM 7-bit default alphabet"; break;
    default: str = "Reserved"; break;
    }

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xf8, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Encoding: %s",
      ansi_637_bigbuf,
      str);

    if (encoding == 0x01)
    {
      other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x07, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s :  Message type: see TIA/EIA/IS-91 (%d)",
          ansi_637_bigbuf,
          msg_type);

      other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0xf8, 8);
      proto_tree_add_text(tree, tvb, offset+1, 1,
          "%s :  Message type",
          ansi_637_bigbuf);

      oct = oct2;
      offset++;
      used++;
    }

    offset++;
    used++;

    /*
     * number of fields
     */
    oct2 = tvb_get_guint8(tvb, offset);
    num_fields = ((oct & 0x07) << 5) | ((oct2 & 0xf8) >> 3);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x07, 8);
    proto_tree_add_text(tree, tvb, offset-1, 1,
      "%s :  Number of fields (MSB): %d",
      ansi_637_bigbuf,
      num_fields);

    other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0xf8, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Number of fields (LSB)",
      ansi_637_bigbuf);

    other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0x07, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Most significant bits of first field",
      ansi_637_bigbuf);

    offset++;
    used++;
    oct = oct2;

    /* NOTE: there are now 3 bits remaining in 'oct' */

    if (len <= used) return;

    /*
     * decode rest if 7-bit ASCII
     */
    if (encoding == 0x02)
    {
      /*
       * magic numbers:
       *    3 bits remaining from last octet
       *    7 bit encoding
       *    8 bits per octet
       */
      i = (num_fields * 7) - 3;
      required_octs = (i / 8) + ((i % 8) ? 1 : 0);

      if (required_octs + used > len)
      {
          proto_tree_add_text(tree, tvb, offset, 1,
            "Missing %d octet(s) for number of fields",
            (required_octs + used) - len);

          return;
      }

      bit = 3;
      saved_offset = offset;

      decode_7_bits(tvb, &offset, num_fields, &oct, &bit, ansi_637_bigbuf);

      proto_tree_add_text(tree, tvb, saved_offset, offset - saved_offset,
          "Encoded user data: %s",
          ansi_637_bigbuf);

      switch (bit)
      {
      case 1: oct2 = 0x01; break;
      case 2: oct2 = 0x03; break;
      case 3: oct2 = 0x07; break;
      case 4: oct2 = 0x0f; break;
      case 5: oct2 = 0x1f; break;
      case 6: oct2 = 0x3f; break;
      case 7: oct2 = 0x7f; break;
      }

      if (bit != 8)
      {
          other_decode_bitfield_value(ansi_637_bigbuf, oct, oct2, 8);
          proto_tree_add_text(tree, tvb, offset - 1, 1,
            "%s :  Reserved",
            ansi_637_bigbuf);
      }
    }
      else if (encoding == 0x03)/* IA5 */
      {
            i = (num_fields * 7) - 3;
            required_octs = (i / 8) + ((i % 8) ? 1 : 0);

            if (required_octs + used > len)
            {
                proto_tree_add_text(tree, tvb, offset, 1,
                                    "Missing %d octet(s) for number of fields",
                                    (required_octs + used) - len);

                return;
            }

            bit = 3;
            saved_offset = offset;
            out_len = decode_7_bits(tvb, &offset, num_fields, &oct, &bit, ansi_637_bigbuf);
            IA5_7BIT_decode(ia5_637_bigbuf, ansi_637_bigbuf, out_len);

            proto_tree_add_text(tree, tvb, saved_offset, offset - saved_offset,
                                "Encoded user data: %s",
                                ia5_637_bigbuf);
      }
      /*TODO UCS else if (encoding == 0x04)
      {
      }*/
    else if (encoding == 0x07)/* Latin/Hebrew */
    {
        saved_offset = offset - 1;
        for (i=0; i < num_fields; i++)
        {
            oct = tvb_get_guint8(tvb, saved_offset);
            oct2 = tvb_get_guint8(tvb, saved_offset + 1);;
            ansi_637_bigbuf[i] = ((oct & 0x07) << 5) | ((oct2 & 0xf8) >> 3);              
            saved_offset++;
        }

        if ((cd = g_iconv_open("UTF-8","iso-8859-8")) != (GIConv)-1)
        {
            utf8_text = g_convert_with_iconv(tvb->real_data +  offset, num_fields , cd , NULL , NULL , &l_conv_error);
            if(!l_conv_error)
            {
                ucs2_item = proto_tree_add_text(tree, tvb, offset, num_fields, "Encoded user data: %s", utf8_text);
            }
            else
            {
                ucs2_item = proto_tree_add_text(tree, tvb, offset, num_fields, "%s", "Failed on iso-8859-8 contact Wireshark developers");
            }
            if(utf8_text)
                g_free(utf8_text);
            g_iconv_close(cd);
        }
    }
    else if (encoding == 0x08) /* Latin */
    {
        saved_offset = offset - 1;
        for (i=0; i < num_fields; i++)
        {
            oct = tvb_get_guint8(tvb, saved_offset);
            oct2 = tvb_get_guint8(tvb, saved_offset + 1);;
            ansi_637_bigbuf[i] = ((oct & 0x07) << 5) | ((oct2 & 0xf8) >> 3);
            saved_offset++;
        }

        if ((cd = g_iconv_open("UTF-8","iso-8859-1")) != (GIConv)-1)
        {
            utf8_text = g_convert_with_iconv(ansi_637_bigbuf , num_fields , cd , NULL , NULL , &l_conv_error);
            if(!l_conv_error)
            {
                ucs2_item = proto_tree_add_text(tree, tvb, offset, num_fields, "Encoded user data: %s", utf8_text);
            }
            else
            {
                ucs2_item = proto_tree_add_text(tree, tvb, offset, num_fields, "%s", "Failed on iso-8859-1 contact Wireshark developers");
            }                 
            if(utf8_text)
                g_free(utf8_text);
            g_iconv_close(cd);
        }
    }
    else if (encoding == 0x09) /* GSM 7-bit default alphabet */
    {
        i = (num_fields * 7) - 3;
        required_octs = (i / 8) + ((i % 8) ? 1 : 0);

        if (required_octs + used > len)
        {
            proto_tree_add_text(tree, tvb, offset, 1,
                                "Missing %d octet(s) for number of fields",
                                (required_octs + used) - len);

            return;
        }

        bit = 3;
        saved_offset = offset;
        out_len = decode_7_bits(tvb, &offset, num_fields, &oct, &bit, ansi_637_bigbuf);
        gsm_sms_char_7bit_ascii_decode(gsm_637_bigbuf, ansi_637_bigbuf, out_len);

        proto_tree_add_text(tree, tvb, saved_offset, offset - saved_offset,
                            "Encoded user data: %s",
                            gsm_637_bigbuf);


    }
    else
    {
        proto_tree_add_text(tree, tvb, offset, len - used,
                            "Encoded user data");
    }
}

static void
tele_param_rsp_code(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;

    EXACT_DATA_CHECK(len, 1);

    /*
     * response code
     */
    oct = tvb_get_guint8(tvb, offset);

    proto_tree_add_text(tree, tvb, offset, 1,
      "Response code: %d",
      oct);
}

static void
tele_param_timestamp(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct, oct2, oct3;

    EXACT_DATA_CHECK(len, 6);

    oct = tvb_get_guint8(tvb, offset);
    oct2 = tvb_get_guint8(tvb, offset+1);
    oct3 = tvb_get_guint8(tvb, offset+2);

    proto_tree_add_text(tree, tvb, offset, 3,
      "Year %d%d, Month %d%d, Day %d%d",
      (oct & 0xf0) >> 4,
      oct & 0x0f,
      (oct2 & 0xf0) >> 4,
      oct2 & 0x0f,
      (oct3 & 0xf0) >> 4,
      oct3 & 0x0f);

    offset += 3;

    oct = tvb_get_guint8(tvb, offset);
    oct2 = tvb_get_guint8(tvb, offset+1);
    oct3 = tvb_get_guint8(tvb, offset+2);

    proto_tree_add_text(tree, tvb, offset, 3,
      "Hour %d%d, Minutes %d%d, Seconds %d%d",
      (oct & 0xf0) >> 4,
      oct & 0x0f,
      (oct2 & 0xf0) >> 4,
      oct2 & 0x0f,
      (oct3 & 0xf0) >> 4,
      oct3 & 0x0f);
}

static void
tele_param_rel_timestamp(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;
    guint32 value = 0;
    const gchar   *str = NULL;
    const gchar   *str2 = NULL;

    EXACT_DATA_CHECK(len, 1);

    oct = tvb_get_guint8(tvb, offset);

    switch (oct)
    {
    case 245: str = "Indefinite"; break;
    case 246: str = "Immediate"; break;
    case 247: str = "Valid until mobile becomes inactive/Deliver when mobile next becomes active"; break;
    case 248: str = "Valid until registration area changes, discard if not registered" ; break;
    default:
      if (oct <= 143) { value = (oct + 1) * 5; str2 = "Minutes"; break; }
      else if ((oct >= 144) && (oct <= 167)) { value = (oct - 143) * 30; str2 = "Minutes + 12 Hours"; break; }
      else if ((oct >= 168) && (oct <= 196)) { value = oct - 166; str2 = "Days"; break; }
      else if ((oct >= 197) && (oct <= 244)) { value = oct - 192; str2 = "Weeks"; break; }
      else { str = "Reserved"; break; }
    }

    if (str == NULL)
    {
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s", str2);
    }
    else
    {
      proto_tree_add_text(tree, tvb, offset, 1,
          "%d %s",
          value, str2);
    }
}

static const value_string tele_param_pri_ind_strings[] = {
    { 0,    "Normal" },
    { 1,    "Interactive" },
    { 2,    "Urgent" },
    { 3,    "Emergency" },
    { 0, NULL }
};

static void
tele_param_pri_ind(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;
    const gchar   *str = NULL;

    EXACT_DATA_CHECK(len, 1);

    oct = tvb_get_guint8(tvb, offset);

    str=val_to_str((oct&0xc0)>>6, tele_param_pri_ind_strings, "Unknown");

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xc0, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  %s",
      ansi_637_bigbuf,
      str);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reserved",
      ansi_637_bigbuf);
}

static void
tele_param_priv_ind(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;
    const gchar   *str = NULL;

    EXACT_DATA_CHECK(len, 1);

    oct = tvb_get_guint8(tvb, offset);

    switch ((oct & 0xc0) >> 6)
    {
    case 0: str = "Not restricted (privacy level 0)"; break;
    case 1: str = "Restricted (privacy level 1)"; break;
    case 2: str = "Confidential (privacy level 2)"; break;
    case 3: str = "Secret (privacy level 3)"; break;
    }

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xc0, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  %s",
      ansi_637_bigbuf,
      str);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reserved",
      ansi_637_bigbuf);
}

static void
tele_param_reply_opt(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;

    EXACT_DATA_CHECK(len, 1);

    oct = tvb_get_guint8(tvb, offset);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x80, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  %s (manual) acknowledgment is requested",
      ansi_637_bigbuf,
      (oct & 0x80) ? "User" : "No user");

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x40, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  %s acknowledgment requested",
      ansi_637_bigbuf,
      (oct & 0x40) ? "Delivery" : "No delivery");

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reserved",
      ansi_637_bigbuf);
}

static void
tele_param_num_messages(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;

    EXACT_DATA_CHECK(len, 1);

    oct = tvb_get_guint8(tvb, offset);

    proto_tree_add_text(tree, tvb, offset, 1,
      "Number of voice mail messages: %d%d",
      (oct & 0xf0) >> 4,
      oct & 0x0f);
}

static void
tele_param_alert(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;
    const gchar   *str = NULL;

    EXACT_DATA_CHECK(len, 1);

    oct = tvb_get_guint8(tvb, offset);

    switch ((oct & 0xc0) >> 6)
    {
    case 0: str = "Use Mobile default alert"; break;
    case 1: str = "Use Low-priority alert"; break;
    case 2: str = "Use Medium-priority alert"; break;
    case 3: str = "Use High-priority alert"; break;
    }

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xc0, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  %s",
      ansi_637_bigbuf,
      str);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reserved",
      ansi_637_bigbuf);
}

static void
tele_param_lang_ind(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;
    const gchar   *str = NULL;

    EXACT_DATA_CHECK(len, 1);

    oct = tvb_get_guint8(tvb, offset);

    switch (oct)
    {
    case 0x00: str = "Unknown or unspecified"; break;
    case 0x01: str = "English"; break;
    case 0x02: str = "French"; break;
    case 0x03: str = "Spanish"; break;
    case 0x04: str = "Japanese"; break;
    case 0x05: str = "Korean"; break;
    case 0x06: str = "Chinese"; break;
    case 0x07: str = "Hebrew"; break;
    default: str = "Reserved"; break;
    }

    proto_tree_add_text(tree, tvb, offset, 1,
      "%s", str);
}

static void
tele_param_cb_num(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct, oct2, num_fields, odd;
    guint32 saved_offset;
    guint32 required_octs;
    guint32 i;

    SHORT_DATA_CHECK(len, 2);

    oct = tvb_get_guint8(tvb, offset);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x80, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Digit mode: %s",
      ansi_637_bigbuf,
      (oct & 0x80) ? "8-bit ASCII" : "4-bit DTMF");

    if (oct & 0x80)
    {
      other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x70, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s :  Type of number: (%d)",
          ansi_637_bigbuf,
          (oct & 0x70) >> 4);

      other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x0f, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s :  Numbering plan: (%d)",
          ansi_637_bigbuf,
          oct & 0x0f);

      offset++;
      num_fields = tvb_get_guint8(tvb, offset);

      other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xff, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s :  Number of fields: (%d)",
          ansi_637_bigbuf,
          num_fields);

      if (num_fields == 0) return;

      if (num_fields > (len - 2))
      {
          proto_tree_add_text(tree, tvb, offset, 1,
            "Missing %d octet(s) for number of fields",
            (num_fields + 2) - len);

          return;
      }

      offset++;

      i = 0;
      while (i < num_fields)
      {
          ansi_637_bigbuf[i] = tvb_get_guint8(tvb, offset+i) & 0x7f;
          i++;
      }
      ansi_637_bigbuf[i] = '\0';

      proto_tree_add_text(tree, tvb, offset, num_fields,
          "Number: %s",
          ansi_637_bigbuf);
    }
    else
    {
      offset++;
      num_fields = (oct & 0x7f) << 1;
      oct2 = tvb_get_guint8(tvb, offset);
      num_fields |= ((oct2 & 0x80) >> 7);

      other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x7f, 8);
      proto_tree_add_text(tree, tvb, offset-1, 1,
          "%s :  Number of fields (MBS): (%d)",
          ansi_637_bigbuf,
          num_fields);

      other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0x80, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s :  Number of fields (LSB)",
          ansi_637_bigbuf);

      oct = oct2;
      odd = FALSE;

      if (num_fields > 0)
      {
          i = (num_fields - 1) * 4;
          required_octs = (i / 8) + ((i % 8) ? 1 : 0);

          if (required_octs + 2 > len)
          {
            proto_tree_add_text(tree, tvb, offset, 1,
                "Missing %d octet(s) for number of fields",
                (required_octs + 2) - len);

            return;
          }

          odd = num_fields & 0x01;
          memset((void *) ansi_637_bigbuf, 0, sizeof(ansi_637_bigbuf));
          saved_offset = offset;
          offset++;

          i = 0;
          while (i < num_fields)
          {
            ansi_637_bigbuf[i] =
                air_digits[(oct & 0x78) >> 3];

            i++;
            if (i >= num_fields) break;

            oct2 = tvb_get_guint8(tvb, offset);
            offset++;

            ansi_637_bigbuf[i] =
                air_digits[((oct & 0x07) << 1) | ((oct2 & 0x80) >> 7)];

            oct = oct2;

            i++;
          }

          proto_tree_add_text(tree, tvb, saved_offset, offset - saved_offset,
            "Number: %s",
            ansi_637_bigbuf);
      }

      other_decode_bitfield_value(ansi_637_bigbuf, oct, odd ? 0x07: 0x7f, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s :  Reserved",
          ansi_637_bigbuf);
    }
}

static void
tele_param_disp_mode(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
    guint8  oct;
    const gchar   *str = NULL;

    EXACT_DATA_CHECK(len, 1);

    oct = tvb_get_guint8(tvb, offset);

    switch ((oct & 0xc0) >> 6)
    {
    case 0: str = "Immediate Display: The mobile station is to display the received message as soon as possible."; break;
    case 1: str = "Mobile default setting: The mobile station is to display the received message based on a pre-defined mode in the mobile station."; break;
    case 2: str = "User Invoke: The mobile station is to display the received message based on the mode selected by the user."; break;
    case 3: str = "Reserved"; break;
    }

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xc0, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  %s",
      ansi_637_bigbuf,
      str);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reserved",
      ansi_637_bigbuf);
}

#define     NUM_TELE_PARAM (sizeof(ansi_tele_param_strings)/sizeof(value_string))
static gint ett_ansi_637_tele_param[NUM_TELE_PARAM];
static void (*ansi_637_tele_param_fcn[])(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset) = {
    tele_param_msg_id,        /* Message Identifier */
    tele_param_user_data,     /* User Data */
    tele_param_rsp_code,      /* User Response Code */
    tele_param_timestamp,     /* Message Center Time Stamp */
    tele_param_timestamp,     /* Validity Period  Absolute */
    tele_param_rel_timestamp, /* Validity Period  Relative */
    tele_param_timestamp,     /* Deferred Delivery Time - Absolute */
    tele_param_rel_timestamp, /* Deferred Delivery Time - Relative */
    tele_param_pri_ind,       /* Priority Indicator */
    tele_param_priv_ind,      /* Privacy Indicator */
    tele_param_reply_opt,     /* Reply Option */
    tele_param_num_messages,  /* Number of Messages */
    tele_param_alert,         /* Alert on Message Delivery */
    tele_param_lang_ind,      /* Language Indicator */
    tele_param_cb_num,        /* Call-Back Number */
    tele_param_disp_mode,     /* Message Display Mode */
    NULL,               /* Multiple Encoding User Data */
    tele_param_msg_status     /* Message status */
};

static void
trans_param_tele_id(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset, gchar *add_string, int string_len)
{
    guint32 value;
    const gchar   *str = NULL;

    EXACT_DATA_CHECK(len, 2);

    value = tvb_get_ntohs(tvb, offset);

    ansi_637_trans_tele_id = value;

    str = match_strval(value, ansi_tele_id_strings);

    if (NULL == str)
    {
      switch (value)
      {
      case 1:
          str = "Reserved for maintenance";
          break;
      case 4102:
          str = "CDMA Service Category Programming Teleservice (SCPT)";
          break;
      case 4103:
          str = "CDMA Card Application Toolkit Protocol Teleservice (CATPT)";
          break;
      case 32513:
          str = "TDMA Cellular Messaging Teleservice";
          break;
      case 32514:
          str = "TDMA Cellular Paging Teleservice (CPT-136)";
          break;
      case 32515:
          str = "TDMA Over-the-Air Activation Teleservice (OATS)";
          break;
      case 32520:
          str = "TDMA System Assisted Mobile Positioning through Satellite (SAMPS)";
          break;
      case 32584:
          str = "TDMA Segmented System Assisted Mobile Positioning Service";
          break;
      default:
          if ((value >= 2) && (value <= 4095))
          {
            str = "Reserved for assignment by TIA-41";
          }
          else if ((value >= 4104) && (value <= 4113))
          {
            str = "Reserved for GSM1x Teleservice (CDMA)";
          }
          else if ((value >= 4114) && (value <= 32512))
          {
            str = "Reserved for assignment by TIA-41";
          }
          else if ((value >= 32521) && (value <= 32575))
          {
            str = "Reserved for assignment by this Standard for TDMA MS-based SMEs";
          }
          else if ((value >= 49152) && (value <= 65535))
          {
            str = "Reserved for carrier specific teleservices";
          }
          else
          {
            str = "Unrecognized Teleservice ID";
          }
          break;
      }
    }

    proto_tree_add_text(tree, tvb, offset, 2,
      "%s (%d)",
      str,
      value);

    g_snprintf(add_string, string_len, " - %s (%d)", str, value);
}

static void
trans_param_srvc_cat(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset, gchar *add_string, int string_len)
{
    guint32 value;
    const gchar   *str = NULL;

    EXACT_DATA_CHECK(len, 2);

    value = tvb_get_ntohs(tvb, offset);

    str = match_strval(value, ansi_srvc_cat_strings);

    if (NULL == str) str = "Reserved";

    proto_tree_add_text(tree, tvb, offset, 2,
      "%s", str);

    g_snprintf(add_string, string_len, " - %s (%d)", str, value);
}

static void
trans_param_address(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset, gchar *add_string _U_, int string_len _U_)
{
    guint8  oct, oct2, num_fields, odd;
    gboolean      email_addr;
    guint32 saved_offset;
    guint32 required_octs;
    guint32 i;
    const gchar   *str;

    SHORT_DATA_CHECK(len, 2);

    email_addr = FALSE;

    oct = tvb_get_guint8(tvb, offset);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x80, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Digit mode: %s",
      ansi_637_bigbuf,
      (oct & 0x80) ? "8-bit ASCII" : "4-bit DTMF");

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x40, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Number mode: %s",
      ansi_637_bigbuf,
      (oct & 0x40) ? "Data Network Address" : "ANSI T1.607");

    if (oct & 0x80)
    {
      if (oct & 0x40)
      {
          switch ((oct & 0x38) >> 3)
          {
          case 0: str = "Unknown"; break;
          case 1: str = "Internet Protocol (RFC 791)"; break;
          case 2: str = "Internet Email Address (RFC 822)"; email_addr = TRUE; break;
          default:
            str = "Reserved";
            break;
          }

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x38, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Type of number: %s (%d)",
            ansi_637_bigbuf,
            str,
            (oct & 0x38) >> 3);

          offset++;
          num_fields = (oct & 0x07) << 5;
          oct2 = tvb_get_guint8(tvb, offset);
          num_fields |= ((oct2 & 0xf8) >> 3);

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x07, 8);
          proto_tree_add_text(tree, tvb, offset-1, 1,
            "%s :  Number of fields (MSB): (%d)",
            ansi_637_bigbuf,
            num_fields);

          other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0xf8, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Number of fields (LSB)",
            ansi_637_bigbuf);

          if (num_fields == 0) return;

          if (num_fields > (len - 2))
          {
            proto_tree_add_text(tree, tvb, offset, 1,
                "Missing %d octet(s) for number of fields",
                (num_fields + 2) - len);

            return;
          }

          other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0x07, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Most significant bits of first field",
            ansi_637_bigbuf);

          offset++;
          oct = oct2;

          i = 0;
          while (i < num_fields)
          {
            ansi_637_bigbuf[i] = (oct & 0x07) << 5;
            ansi_637_bigbuf[i] |= ((oct = tvb_get_guint8(tvb, offset+i)) & 0xf8) >> 3;
            i++;
          }
          ansi_637_bigbuf[i] = '\0';

          if (email_addr)
          {
            proto_tree_add_text(tree, tvb, offset, num_fields - 1,
                "Number: %s",
                ansi_637_bigbuf);
          }
          else
          {
            proto_tree_add_bytes(tree, hf_ansi_637_trans_bin_addr, tvb, offset, num_fields - 1,
                (guint8*)ansi_637_bigbuf);
          }

          offset += (num_fields - 1);

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xf8, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Least significant bits of last field",
            ansi_637_bigbuf);

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x07, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Reserved",
            ansi_637_bigbuf);
      }
      else
      {
          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x38, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Type of number: (%d)",
            ansi_637_bigbuf,
            (oct & 0x38) >> 3);

          oct2 = tvb_get_guint8(tvb, offset + 1);

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x07, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Numbering plan (MSB): (%d)",
            ansi_637_bigbuf,
            ((oct & 0x07) << 1) | ((oct2 & 0x80) >> 7));

          offset++;
          oct = oct2;

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x80, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Numbering plan (LSB)",
            ansi_637_bigbuf);

          offset++;
          num_fields = (oct & 0x7f) << 1;
          oct2 = tvb_get_guint8(tvb, offset);
          num_fields |= ((oct2 & 0x80) >> 7);

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x7f, 8);
          proto_tree_add_text(tree, tvb, offset-1, 1,
            "%s :  Number of fields (MSB): (%d)",
            ansi_637_bigbuf,
            num_fields);

          other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0x80, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Number of fields (LSB)",
            ansi_637_bigbuf);

          if (num_fields == 0) return;

          if (num_fields > (len - 3))
          {
            proto_tree_add_text(tree, tvb, offset, 1,
                "Missing %d octet(s) for number of fields",
                (num_fields + 3) - len);

            return;
          }

          other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0x7f, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Most significant bits of first field",
            ansi_637_bigbuf);

          offset++;
          oct = oct2;

          i = 0;
          while (i < num_fields)
          {
            ansi_637_bigbuf[i] = (oct & 0x7f) << 1;
            ansi_637_bigbuf[i] |= ((oct = tvb_get_guint8(tvb, offset+i)) & 0x80) >> 7;
            i++;
          }
          ansi_637_bigbuf[i] = '\0';

          proto_tree_add_text(tree, tvb, offset, num_fields - 1,
            "Number: %s",
            ansi_637_bigbuf);

          offset += (num_fields - 1);

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x80, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Least significant bit of last field",
            ansi_637_bigbuf);

          other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x7f, 8);
          proto_tree_add_text(tree, tvb, offset, 1,
            "%s :  Reserved",
            ansi_637_bigbuf);
      }
    }
    else
    {
      offset++;
      num_fields = (oct & 0x3f) << 2;
      oct2 = tvb_get_guint8(tvb, offset);
      num_fields |= ((oct2 & 0xc0) >> 6);

      other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x3f, 8);
      proto_tree_add_text(tree, tvb, offset-1, 1,
          "%s :  Number of fields (MSB): (%d)",
          ansi_637_bigbuf,
          num_fields);

      other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0xc0, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s :  Number of fields (LSB)",
          ansi_637_bigbuf);

      oct = oct2;
      odd = FALSE;

      if (num_fields > 0)
      {
          i = (num_fields - 1) * 4;
          required_octs = (i / 8) + ((i % 8) ? 1 : 0);

          if (required_octs + 2 > len)
          {
            proto_tree_add_text(tree, tvb, offset, 1,
                "Missing %d octet(s) for number of fields",
                (required_octs + 2) - len);

            return;
          }

          odd = num_fields & 0x01;
          memset((void *) ansi_637_bigbuf, 0, sizeof(ansi_637_bigbuf));
          saved_offset = offset;
          offset++;

          i = 0;
          while (i < num_fields)
          {
            ansi_637_bigbuf[i] =
                air_digits[(oct & 0x3c) >> 2];

            i++;
            if (i >= num_fields) break;

            oct2 = tvb_get_guint8(tvb, offset);
            offset++;

            ansi_637_bigbuf[i] =
                air_digits[((oct & 0x03) << 2) | ((oct2 & 0xc0) >> 6)];

            oct = oct2;

            i++;
          }

          proto_tree_add_text(tree, tvb, saved_offset, offset - saved_offset,
            "Number: %s",
            ansi_637_bigbuf);
      }

      other_decode_bitfield_value(ansi_637_bigbuf, oct, odd ? 0x03: 0x3f, 8);
      proto_tree_add_text(tree, tvb, offset, 1,
          "%s :  Reserved",
          ansi_637_bigbuf);
    }
}

static void
trans_param_subaddress(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset, gchar *add_string _U_, int string_len _U_)
{
    guint8  oct, oct2, num_fields;
    guint32 i;
    const gchar   *str;

    SHORT_DATA_CHECK(len, 2);

    oct = tvb_get_guint8(tvb, offset);

    switch ((oct & 0xe0) >> 5)
    {
    case 0: str = "NSAP (CCITT Recommendation X.213 or ISO 8348 AD2)"; break;
    case 1: str = "User-specified"; break;
    default:
      str = "Reserved";
      break;
    }

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xe0, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Type: %s",
      ansi_637_bigbuf,
      str);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x10, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Odd",
      ansi_637_bigbuf);

    offset++;
    num_fields = (oct & 0x0f) << 4;
    oct2 = tvb_get_guint8(tvb, offset);
    num_fields |= ((oct2 & 0xf0) >> 4);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x0f, 8);
    proto_tree_add_text(tree, tvb, offset-1, 1,
      "%s :  Number of fields (MSB): (%d)",
      ansi_637_bigbuf,
      num_fields);

    other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0xf0, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Number of fields (LSB)",
      ansi_637_bigbuf);

    if (num_fields == 0) return;

    if (num_fields > (len - 2))
    {
      proto_tree_add_text(tree, tvb, offset, 1,
          "Missing %d octet(s) for number of fields",
          (num_fields + 2) - len);

      return;
    }

    other_decode_bitfield_value(ansi_637_bigbuf, oct2, 0x0f, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Most significant bits of first field",
      ansi_637_bigbuf);

    offset++;
    oct = oct2;

    i = 0;
    while (i < num_fields)
    {
      ansi_637_bigbuf[i] = (oct & 0x0f) << 4;
      ansi_637_bigbuf[i] |= ((oct = tvb_get_guint8(tvb, offset+i)) & 0xf0) >> 4;
      i++;
    }
    ansi_637_bigbuf[i] = '\0';

    proto_tree_add_bytes(tree, hf_ansi_637_trans_bin_addr, tvb, offset, num_fields - 1,
      (guint8*)ansi_637_bigbuf);

    offset += (num_fields - 1);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xf0, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Least significant bits of last field",
      ansi_637_bigbuf);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x0f, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reserved",
      ansi_637_bigbuf);
}

static void
trans_param_bearer_reply_opt(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset, gchar *add_string, int string_len)
{
    guint8  oct;

    len = len;
    oct = tvb_get_guint8(tvb, offset);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xfc, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reply Sequence Number: %d",
      ansi_637_bigbuf,
      (oct & 0xfc) >> 2);

    g_snprintf(add_string, string_len, " - Reply Sequence Number (%d)", (oct & 0xfc) >> 2);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x03, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reserved",
      ansi_637_bigbuf);
}

static void
trans_param_cause_codes(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset, gchar *add_string, int string_len)
{
    guint8  oct;
    const gchar   *str = NULL;

    oct = tvb_get_guint8(tvb, offset);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0xfc, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Reply Sequence Number: %d",
      ansi_637_bigbuf,
      (oct & 0xfc) >> 2);

    switch (oct & 0x03)
    {
    case 0x00: str = "No error"; break;
    case 0x02: str = "Temporary Condition"; break;
    case 0x03: str = "Permanent Condition"; break;
    default:
      str = "Reserved";
      break;
    }

    g_snprintf(add_string, string_len, " - Reply Sequence Number (%d)", (oct & 0xfc) >> 2);

    other_decode_bitfield_value(ansi_637_bigbuf, oct, 0x03, 8);
    proto_tree_add_text(tree, tvb, offset, 1,
      "%s :  Error Class: %s",
      ansi_637_bigbuf,
      str);

    offset++;

    if (!(oct & 0x03)) return;

    if (len == 1) return;

    oct = tvb_get_guint8(tvb, offset);

    switch (oct)
    {
    case 0: str = "Address vacant"; break;
    case 1: str = "Address translation failure"; break;
    case 2: str = "Network resource shortage"; break;
    case 3: str = "Network failure"; break;
    case 4: str = "Invalid Teleservice ID"; break;
    case 5: str = "Other network problem"; break;
    case 6: str = "Unsupported network interface"; break;
    case 32: str = "No page response"; break;
    case 33: str = "Destination busy"; break;
    case 34: str = "No acknowledgement"; break;
    case 35: str = "Destination resource shortage"; break;
    case 36: str = "SMS delivery postponed"; break;
    case 37: str = "Destination out of service"; break;
    case 38: str = "Destination no longer at this address"; break;
    case 39: str = "Other terminal problem"; break;
    case 64: str = "Radio interface resource shortage"; break;
    case 65: str = "Radio interface incompatibility"; break;
    case 66: str = "Other radio interface problem"; break;
    case 67: str = "Unsupported Base Station Capability"; break;
    case 96: str = "Encoding problem"; break;
    case 97: str = "Service origination denied"; break;
    case 98: str = "Service termination denied"; break;
    case 99: str = "Supplementary service not supported"; break;
    case 100: str = "Service not supported"; break;
    case 101: str = "Reserved"; break;
    case 102: str = "Missing expected parameter"; break;
    case 103: str = "Missing mandatory parameter"; break;
    case 104: str = "Unrecognized parameter value"; break;
    case 105: str = "Unexpected parameter value"; break;
    case 106: str = "User Data size error"; break;
    case 107: str = "Other general problems"; break;
    case 108: str = "Session not active"; break;
    default:
      if ((oct >= 7) && (oct <= 31)) { str = "Reserved, treat as Other network problem"; }
      else if ((oct >= 40) && (oct <= 47)) { str = "Reserved, treat as Other terminal problem"; }
      else if ((oct >= 48) && (oct <= 63)) { str = "Reserved, treat as SMS delivery postponed"; }
      else if ((oct >= 68) && (oct <= 95)) { str = "Reserved, treat as Other radio interface problem"; }
      else if ((oct >= 109) && (oct <= 223)) { str = "Reserved, treat as Other general problems"; }
      else { str = "Reserved for protocol extension, treat as Other general problems"; }
      break;
    }

    proto_tree_add_text(tree, tvb, offset, 1,
      "%s", str);
}

static void
trans_param_bearer_data(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset, gchar *add_string _U_, int string_len _U_)
{
    tvbuff_t      *tele_tvb;

    proto_tree_add_text(tree, tvb, offset, len,
      "Bearer Data");

    /*
     * dissect the embedded teleservice data
     */
    tele_tvb = tvb_new_subset(tvb, offset, len, len);

    dissector_try_port(tele_dissector_table, ansi_637_trans_tele_id,
      tele_tvb, g_pinfo, g_tree);
}

#define     NUM_TRANS_PARAM (sizeof(ansi_trans_param_strings)/sizeof(value_string))
static gint ett_ansi_637_trans_param[NUM_TRANS_PARAM];
static void (*ansi_637_trans_param_fcn[])(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset, gchar *add_string, int string_len) = {
    trans_param_tele_id,      /* Teleservice Identifier */
    trans_param_srvc_cat,     /* Service Category */
    trans_param_address,      /* Originating Address */
    trans_param_subaddress,   /* Originating Subaddress */
    trans_param_address,      /* Destination Address */
    trans_param_subaddress,   /* Destination Subaddress */
    trans_param_bearer_reply_opt,   /* Bearer Reply Option */
    trans_param_cause_codes,  /* Cause Codes */
    trans_param_bearer_data,  /* Bearer Data */
    NULL,   /* NONE */
};

#define     NUM_TRANS_MSG_TYPE (sizeof(ansi_trans_msg_type_strings)/sizeof(value_string))
static gint ett_ansi_637_trans_msg[NUM_TRANS_MSG_TYPE];

/* GENERIC IS-637 DISSECTOR FUNCTIONS */

static gboolean
dissect_ansi_637_tele_param(tvbuff_t *tvb, proto_tree *tree, guint32 *offset)
{
    void (*param_fcn)(tvbuff_t *, proto_tree *, guint, guint32) = NULL;
    guint8  oct;
    guint8  len;
    guint32 curr_offset;
    gint    ett_param_idx, idx;
    proto_tree    *subtree;
    proto_item    *item;
    const gchar   *str = NULL;


    curr_offset = *offset;

    oct = tvb_get_guint8(tvb, curr_offset);
    str = match_strval_idx((guint32) oct, ansi_tele_param_strings, &idx);

    if (NULL == str)
    {
      return(FALSE);
    }

    ett_param_idx = ett_ansi_637_tele_param[idx];
    param_fcn = ansi_637_tele_param_fcn[idx];

    item =
      proto_tree_add_text(tree, tvb, curr_offset, -1, "%s", str);

    subtree = proto_item_add_subtree(item, ett_param_idx);

    proto_tree_add_uint(subtree, hf_ansi_637_tele_subparam_id,
      tvb, curr_offset, 1, oct);

    curr_offset++;

    len = tvb_get_guint8(tvb, curr_offset);

    proto_item_set_len(item, (curr_offset - *offset) + len + 1);

    proto_tree_add_uint(subtree, hf_ansi_637_tele_length,
      tvb, curr_offset, 1, len);

    curr_offset++;

    if (len > 0)
    {
      if (param_fcn == NULL)
      {
          proto_tree_add_text(subtree, tvb, curr_offset,
            len, "Parameter Data");
      }
      else
      {
          (*param_fcn)(tvb, subtree, len, curr_offset);
      }

      curr_offset += len;
    }

    *offset = curr_offset;

    return(TRUE);
}

static void
dissect_ansi_637_tele_message(tvbuff_t *tvb, proto_tree *ansi_637_tree)
{
    guint8  len;
    guint32 curr_offset;

    curr_offset = 0;
    len = tvb_length(tvb);

    while ((len - curr_offset) > 0)
    {
      if (!dissect_ansi_637_tele_param(tvb, ansi_637_tree, &curr_offset))
      {
          proto_tree_add_text(ansi_637_tree, tvb, curr_offset, len - curr_offset,
            "Unknown Parameter Data");
          break;
      }
    }
}

static void
dissect_ansi_637_tele(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
    proto_item    *ansi_637_item;
    proto_tree    *ansi_637_tree = NULL;
    const gchar   *str = NULL;
    guint32 value;

    if (check_col(pinfo->cinfo, COL_PROTOCOL))
    {
      col_set_str(pinfo->cinfo, COL_PROTOCOL, ansi_proto_name_short);
    }

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

      /*
       * create the ansi_637 protocol tree
       */
      str = match_strval(value, ansi_tele_id_strings);

      if (NULL == str)
      {
          switch (value)
          {
          case 1:
            str = "Reserved for maintenance";
            break;
          case 4102:
            str = "CDMA Service Category Programming Teleservice (SCPT)";
            break;
          case 4103:
            str = "CDMA Card Application Toolkit Protocol Teleservice (CATPT)";
            break;
          case 32513:
            str = "TDMA Cellular Messaging Teleservice";
            break;
          case 32514:
            str = "TDMA Cellular Paging Teleservice (CPT-136)";
            break;
          case 32515:
            str = "TDMA Over-the-Air Activation Teleservice (OATS)";
            break;
          case 32520:
            str = "TDMA System Assisted Mobile Positioning through Satellite (SAMPS)";
            break;
          case 32584:
            str = "TDMA Segmented System Assisted Mobile Positioning Service";
            break;
          default:
            if ((value >= 2) && (value <= 4095))
            {
                str = "Reserved for assignment by TIA-41";
            }
            else if ((value >= 4104) && (value <= 4113))
            {
                str = "Reserved for GSM1x Teleservice (CDMA)";
            }
            else if ((value >= 4114) && (value <= 32512))
            {
                str = "Reserved for assignment by TIA-41";
            }
            else if ((value >= 32521) && (value <= 32575))
            {
                str = "Reserved for assignment by this Standard for TDMA MS-based SMEs";
            }
            else if ((value >= 49152) && (value < 65535))
            {
                str = "Reserved for carrier specific teleservices";
            }
            else if (value == 65535)
            {
                /*
                 * supposed to be "Reserved for carrier specific teleservices"
                 * but we are using it to key SMS Broadcast dissection were
                 * there is no teleservice ID
                 */
                str = "(Reserved) Being used for Broadcast";
            }
            else
            {
                str = "Unrecognized Teleservice ID";
            }
            break;
          }
      }

      ansi_637_item =
          proto_tree_add_protocol_format(tree, proto_ansi_637_tele, tvb, 0, -1,
            "%s - %s (%d)",
            ansi_proto_name_tele,
            str,
            pinfo->match_port);

      ansi_637_tree =
          proto_item_add_subtree(ansi_637_item, ett_ansi_637_tele);

      dissect_ansi_637_tele_message(tvb, ansi_637_tree);
    }
}

static gboolean
dissect_ansi_637_trans_param(tvbuff_t *tvb, proto_tree *tree, guint32 *offset)
{
    void (*param_fcn)(tvbuff_t *, proto_tree *, guint, guint32, gchar *, int) = NULL;
    guint8  oct;
    guint8  len;
    guint32 curr_offset;
    gint    ett_param_idx, idx;
    proto_tree    *subtree;
    proto_item    *item;
    const gchar   *str = NULL;

    curr_offset = *offset;

    oct = tvb_get_guint8(tvb, curr_offset);
    str = match_strval_idx((guint32) oct, ansi_trans_param_strings, &idx);

    if (NULL == str)
    {
      return(FALSE);
    }

    ett_param_idx = ett_ansi_637_trans_param[idx];
    param_fcn = ansi_637_trans_param_fcn[idx];

    item =
      proto_tree_add_text(tree, tvb, curr_offset, -1, "%s", str);

    subtree = proto_item_add_subtree(item, ett_param_idx);

    proto_tree_add_uint(subtree, hf_ansi_637_trans_param_id,
      tvb, curr_offset, 1, oct);

    curr_offset++;

    len = tvb_get_guint8(tvb, curr_offset);

    proto_item_set_len(item, (curr_offset - *offset) + len + 1);

    proto_tree_add_uint(subtree, hf_ansi_637_trans_length,
      tvb, curr_offset, 1, len);

    curr_offset++;

    if (len > 0)
    {
      if (param_fcn == NULL)
      {
          proto_tree_add_text(subtree, tvb, curr_offset,
            len, "Parameter Data");
      }
      else
      {
            gchar *ansi_637_add_string;

          ansi_637_add_string = ep_alloc(1024);
          ansi_637_add_string[0] = '\0';
          (*param_fcn)(tvb, subtree, len, curr_offset, ansi_637_add_string, 1024);

          if (ansi_637_add_string[0] != '\0')
          {
            proto_item_append_text(item, "%s", ansi_637_add_string);
          }
      }

      curr_offset += len;
    }

    *offset = curr_offset;

    return(TRUE);
}

static void
dissect_ansi_637_trans(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
    proto_item    *ansi_637_item;
    proto_tree    *ansi_637_tree = NULL;
    guint32 curr_offset;
    gint    idx;
    const gchar   *str = NULL;
    guint8  oct;
    guint8  len;

    if (check_col(pinfo->cinfo, COL_PROTOCOL))
    {
      col_set_str(pinfo->cinfo, COL_PROTOCOL, ansi_proto_name_short);
    }

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

      /*
       * reset the teleservice ID for each dissection
       */
      ansi_637_trans_tele_id = 0;

      /*
       * create the ansi_637 protocol tree
       */
      oct = tvb_get_guint8(tvb, 0);

      str = match_strval_idx(oct, ansi_trans_msg_type_strings, &idx);

      if (NULL == str)
      {
          ansi_637_item =
            proto_tree_add_protocol_format(tree, proto_ansi_637_trans, tvb, 0, -1,
                "%s - Unrecognized Transport Layer Message Type (%d)",
                ansi_proto_name_trans,
                oct);

          ansi_637_tree =
            proto_item_add_subtree(ansi_637_item, ett_ansi_637_trans);
      }
      else
      {
          ansi_637_item =
            proto_tree_add_protocol_format(tree, proto_ansi_637_trans, tvb, 0, -1,
                "%s - %s",
                ansi_proto_name_trans,
                str);

          ansi_637_tree =
            proto_item_add_subtree(ansi_637_item, ett_ansi_637_trans_msg[idx]);

          if (oct == ANSI_TRANS_MSG_TYPE_BROADCAST)
          {
            /*
             * there is no teleservice ID for Broadcast but we want the
             * bearer data to be dissected
             *
             * using a reserved value to key dissector port
             */
            ansi_637_trans_tele_id = 65535;
          }
      }

      curr_offset = 1;

      len = tvb_length(tvb);

      while ((len - curr_offset) > 0)
      {
          if (!dissect_ansi_637_trans_param(tvb, ansi_637_tree, &curr_offset))
          {
            proto_tree_add_text(ansi_637_tree, tvb, curr_offset, len - curr_offset,
                "Unknown Parameter Data");
            break;
          }
      }
    }
}

/* Register the protocol with Wireshark */
void
proto_register_ansi_637(void)
{
    guint         i;

    /* Setup list of header fields */
    static hf_register_info hf_trans[] =
    {
      { &hf_ansi_637_trans_msg_type,
        { "Message Type",
          "ansi_637_trans.msg_type",
          FT_UINT24, BASE_DEC, VALS(ansi_trans_msg_type_strings), 0xf00000,
          NULL, HFILL }},
      { &hf_ansi_637_trans_param_id,
          { "Transport Param ID", "ansi_637_trans.param_id",
          FT_UINT8, BASE_DEC, VALS(ansi_trans_param_strings), 0,
          NULL, HFILL }},
      { &hf_ansi_637_trans_length,
          { "Length", "ansi_637_trans.len",
          FT_UINT8, BASE_DEC, NULL, 0,
          NULL, HFILL }},
      { &hf_ansi_637_trans_bin_addr,
          { "Binary Address", "ansi_637_trans.bin_addr",
          FT_BYTES, BASE_HEX, 0, 0,
          NULL, HFILL }},
      };
    static hf_register_info hf_tele[] =
    {
      { &hf_ansi_637_tele_msg_type,
        { "Message Type",
          "ansi_637_tele.msg_type",
          FT_UINT24, BASE_DEC, VALS(ansi_tele_msg_type_strings), 0xf00000,
          NULL, HFILL }},
      { &hf_ansi_637_tele_msg_id,
        { "Message ID",
          "ansi_637_tele.msg_id",
          FT_UINT24, BASE_DEC, NULL, 0x0ffff0,
          NULL, HFILL }},
      { &hf_ansi_637_tele_msg_status,
        { "Message Status",
          "ansi_637_tele.msg_status",
          FT_UINT8, BASE_DEC, VALS(ansi_tele_msg_status_strings), 0,
          NULL, HFILL }},
      { &hf_ansi_637_tele_msg_rsvd,
        { "Reserved",
          "ansi_637_tele.msg_rsvd",
          FT_UINT24, BASE_DEC, NULL, 0x00000f,
          NULL, HFILL }},
      { &hf_ansi_637_tele_length,
          { "Length", "ansi_637_tele.len",
          FT_UINT8, BASE_DEC, NULL, 0,
          NULL, HFILL }},
      { &hf_ansi_637_tele_subparam_id,
          { "Teleservice Subparam ID", "ansi_637_tele.subparam_id",
          FT_UINT8, BASE_DEC, VALS(ansi_tele_param_strings), 0,
          NULL, HFILL }},
    };

    /* Setup protocol subtree array */
#define     NUM_INDIVIDUAL_PARAMS   3
    static gint *ett[NUM_INDIVIDUAL_PARAMS+NUM_TELE_PARAM+NUM_TRANS_MSG_TYPE+NUM_TRANS_PARAM];

    memset((void *) ett, 0, sizeof(ett));

    ett[0] = &ett_ansi_637_tele;
    ett[1] = &ett_ansi_637_trans;
    ett[2] = &ett_params;

    for (i=0; i < NUM_TELE_PARAM; i++)
    {
      ett_ansi_637_tele_param[i] = -1;
      ett[NUM_INDIVIDUAL_PARAMS+i] = &ett_ansi_637_tele_param[i];
    }

    for (i=0; i < NUM_TRANS_MSG_TYPE; i++)
    {
      ett_ansi_637_trans_msg[i] = -1;
      ett[NUM_INDIVIDUAL_PARAMS+NUM_TELE_PARAM+i] = &ett_ansi_637_trans_msg[i];
    }

    for (i=0; i < NUM_TRANS_PARAM; i++)
    {
      ett_ansi_637_trans_param[i] = -1;
      ett[NUM_INDIVIDUAL_PARAMS+NUM_TELE_PARAM+NUM_TRANS_MSG_TYPE+i] = &ett_ansi_637_trans_param[i];
    }

    /* Register the protocol name and description */
    proto_ansi_637_tele =
      proto_register_protocol(ansi_proto_name_tele, "ANSI IS-637-A Teleservice", "ansi_637_tele");

    proto_ansi_637_trans =
      proto_register_protocol(ansi_proto_name_trans, "ANSI IS-637-A Transport", "ansi_637_trans");

      register_dissector("ansi_637_tele", dissect_ansi_637_tele, proto_ansi_637_tele);
      register_dissector("ansi_637_trans", dissect_ansi_637_trans, proto_ansi_637_trans);

    /* Required function calls to register the header fields and subtrees used */
    proto_register_field_array(proto_ansi_637_tele, hf_tele, array_length(hf_tele));
    proto_register_field_array(proto_ansi_637_trans, hf_trans, array_length(hf_trans));
    proto_register_subtree_array(ett, array_length(ett));

    tele_dissector_table =
      register_dissector_table("ansi_637.tele_id",
          "ANSI IS-637-A Teleservice ID", FT_UINT8, BASE_DEC);
}


void
proto_reg_handoff_ansi_637(void)
{
    dissector_handle_t  ansi_637_tele_handle;
    dissector_handle_t  ansi_637_trans_handle;
    guint         i;

    ansi_637_tele_handle = create_dissector_handle(dissect_ansi_637_tele, proto_ansi_637_tele);
    ansi_637_trans_handle = create_dissector_handle(dissect_ansi_637_trans, proto_ansi_637_trans);

    /*
     * register for all known teleservices
     * '-1' is to stop before trailing '0' entry
     *
     * to add teleservices, modify 'ansi_tele_id_strings'
     */
    for (i=0; i < ((sizeof(ansi_tele_id_strings)/sizeof(value_string))-1); i++)
    {
      /*
       * ANSI MAP dissector will push out teleservice ids
       */
      dissector_add("ansi_map.tele_id", ansi_tele_id_strings[i].value, ansi_637_tele_handle);

      /*
       * we will push out teleservice ids after Transport layer decode
       */
      dissector_add("ansi_637.tele_id", ansi_tele_id_strings[i].value, ansi_637_tele_handle);
    }

    /*
     * ANSI A-interface will push out transport layer data
     */
    dissector_add("ansi_a.sms", 0, ansi_637_trans_handle);

    /* data_handle = find_dissector("data"); */
}

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