Fetching all pages of specific pagetype over multiple sites

Hi!

We are currently using IPageCriteriaQueryService which allows me to fetch all pages of a specific type with FindPagesWithCriteria. My problem is that a pagereference parameter is required and I need to fetch all pages of a specific type regardless of startpage or site (we have multiple sites sharing EPIServer database).

Does anyone have an idea of the best way to achieve this?

/regards