Import Phone field CCK

The reason that I called it cs_phone.inc is that the I found in table content_node_field that the type for my field is cs_phone as email for some other field.
So I thought it will be the best to use it.
On your advice a changed it as mentioned below. and it works! thx.
It has just one small failure. That it shows unsoupported

file phone.inc

// $Id: phone.inc,v 1.0.0.0 2009/04/12 21:54:41 hoke Exp $

/**
 * @file
 * Support file for the CCK phone module.
 */

/**
 * Implementation of hook_node_import_fields().
 */
function phone_node_import_fields($type) {
  $fields = array();

  foreach (node_import_cck_fields($type, 'phone') as $fieldname => $fieldinfo) {
    foreach ($fieldinfo['columns'] as $colname => $colinfo) {
      $cck_fieldname = node_import_cck_name($fieldname, $colname);

      $fields[$cck_fieldname] = node_import_cck_field_defaults($fieldinfo);

      switch ($colname) {
        case 'phone':
          $fields[$cck_fieldname]['title'] = $fieldinfo['widget']['label'];
          $fields[$cck_fieldname]['is_required'] = $fieldinfo['required'];
          break;

        default:
          $fields[$cck_fieldname]['title'] = t('Unsupported: ') . $fieldinfo['widget']['label'] .' - '. $colname;
          break;
      }
    }
  }

  return $fields;
}

this file is no enough.

there must be added somethink like next code to node_import.inc row 211

        case 'phone':
          $fields[$type][$fieldname]['preprocess'][] = 'node_import_check_phone';
          break;
 

and than to node_import.inc row 1141

 * Check if the value is a valid phone number.
 *
 * Uses: nothing.
 */
function node_import_check_phone(&$value, $field, $options, $preview) {
  if (!valid_phone_number("country code", $value)) {
    node_import_input_error(t('Input error: %value is not a valid phone number.', array('%value' => $value)));
    return FALSE;
  }
  return TRUE;
}

but as I see, there is no valid_phone_number in .inc file like valid_email_number in includes/common.inc
the valid_phone_number is in phone.module and is tested on country code.
which is a little bit to much to me to find the right way. :(

so if any body knows how to do it, it would be great.
thx in advance