Can you create a pstn setup in a virtual lab

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I am reading through the 70-291 ms book just now to get a feel for it and then will re read taking notes and doing the setups, but how do I set the labs that require 2 pstn lines as I use virtualbox for all of my setup?

 

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There is a free virtual network software out there called GNS3 that allow you to link the VirtualBox machines to it (but its a pain to setup and fully benefit for it). I'm not sure how easily it is to, if at all possible to make a PSTN with just VirtualBox

 

cheers, i will have a look at it.