Is it possible to mimic pstn in virtualbox

Evening,
I am working through the 70-291 and was wondering if it is possible to setup a lab with 2 pstn so I can setup dial up connection and do some of the practices in the book?
Thanks
James
I am working through the 70-291 and was wondering if it is possible to setup a lab with 2 pstn so I can setup dial up connection and do some of the practices in the book?
Thanks
James