function getBlockedContacts($standardFields = array(), $customFields = array(), $pageIndex = 1, $pageSize = 1000)
    {
        $queryParameters = array(
            'standard_field' => $standardFields,
            'page_index' => $pageIndex,
            'page_size' => $pageSize
        );

        $queryParameters = $this->appendArrayFields($queryParameters, 'custom_field', $customFields);

        return $this->get('contacts/blocked', $queryParameters);
    }