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Symfony 1.4, Pager Navigation, additional URL parameters

I'd like to create a pageable blog archive like this:

blog_archive:

    url: /blog/archive/:year/:month/:page

    class: sfDoctrineRoute

    options: { model: Blog, type: list }

    param: { module: blog, action: listArchive, page: 1 }

    requirements:

        year: \d+

        month: \d+

        sf_method: [get, post]

This works fine, creating including the pager:

    public function executeListArchive(sfWebRequest $request) {

...

        $this->pager = ReviewTable::getInstance()->getArchivePager($page, $this->hitsperpage, $this->year, $this->month);

However, if I add the pager_navigation() to the Template like this:

<?php echo pager_navigation($pager, 'blog_archive') ?>

, I get an error message like "The "/blog/archive/:year/:month/:page" route has some missing mandatory parameters (:year, :month)." If I change the code to

<?php echo pager_navigation($pager, '@blog_archive?year='.$year.'&month='.$month) ?>

, the Pager doesn't work, because the page parameter isn't added to the URL.