{
  osip_content_disposition_t *content_disposition;
  int i;

  if (hvalue == NULL || hvalue[0] == '\0')
    return 0;

  i = osip_content_disposition_init (&content_disposition);
  if (i != 0)
    return -1;
  i = osip_content_disposition_parse (content_disposition, hvalue);
  if (i != 0)
    {
      osip_content_disposition_free (content_disposition);
      return -1;
    }
  sip->message_property = 2;
  osip_list_add (sip->content_dispositions, content_disposition, -1);
  return 0;
}