[KevinH]

Need more info:

Are these fixed page numbers based on a specific printed book with a known isbn?

Or are you talking about reflowable page numbers that most readers display?

If the latter, you really need do nothing, the e-reader will synthesize them for you.

If the former, does your xhtml source already include the id attribute on anchors at points where the page transition happens in the printed version?

Also is this epub2 or an epub3?

And finally, is this an academic work where there is the need to match and cite specific page numbers from a printed edition?

If not, you are better off without them.

Tables of contents, lists of figures, and other things based on page numbers really should be converted to links and the page numbers removed since epub is meant to be a reflowable format.