code: def _is_number_matching_desc(national_number, number_desc):
      
      # Check if any possible number lengths are present; if so, we use them to avoid checking the
      # validation pattern if they don't match. If they are absent, this means they match the general
      # description, which we have already checked before checking a specific number type.
      if number_desc is None:
          return False
      actual_length = len(national_number)
      possible_lengths = number_desc.possible_length
      if len(possible_lengths) > 0 and actual_length not in possible_lengths:
          return False
      return _match_national_number(national_number, number_desc, False)
docs: Determine if the number matches the given PhoneNumberDesc