code: def _is_number_match_SS(number1, number2):
      
      try:
          numobj1 = parse(number1, UNKNOWN_REGION)
          return _is_number_match_OS(numobj1, number2)
      except NumberParseException:
          _, exc, _ = sys.exc_info()
          if exc.error_type == NumberParseException.INVALID_COUNTRY_CODE:
              try:
                  numobj2 = parse(number2, UNKNOWN_REGION)
                  return _is_number_match_OS(numobj2, number1)
              except NumberParseException:
                  _, exc2, _ = sys.exc_info()
                  if exc2.error_type == NumberParseException.INVALID_COUNTRY_CODE:
                      try:
                          numobj1 = parse(number1, None, keep_raw_input=False,
                                          _check_region=False, numobj=None)
                          numobj2 = parse(number2, None, keep_raw_input=False,
                                          _check_region=False, numobj=None)
                          return _is_number_match_OO(numobj1, numobj2)
                      except NumberParseException:
                          return MatchType.NOT_A_NUMBER
  
      # One or more of the phone numbers we are trying to match is not a viable
      # phone number.
      return MatchType.NOT_A_NUMBER
docs: Takes two phone numbers as strings and compares them for equality.
  
      This is a convenience wrapper for _is_number_match_OO/_is_number_match_OS.
      No default region is known.