public function getCategoryPageUrl($category, $pageNumber, $languageId = null, $isFixed = null)
    {
        if (!isset($languageId)) {
            $languageId = $category->getLanguage();
        }
        $stdUrl = $category->getBaseStdLink($languageId);
        $parameters = null;

        $stdUrl = $this->_trimUrl($stdUrl, $languageId);
        $seoUrl = $this->getCategoryUri($category, $languageId);

        if ($isFixed === null) {
            $isFixed = $this->_isFixed('oxcategory', $category->getId(), $languageId);
        }

        return $this->assembleFullPageUrl($category, 'oxcategory', $stdUrl, $seoUrl, $pageNumber, $parameters, $languageId, $isFixed);
    }