Hi 1ACS1,
You will need to use OPX circuits. You need to specify the direction as well. What I mean is that you need X number to originate at one site and terminate at the other and vice-versa. You may need to use off premise range extenders as well. On the bright side, it's cheaper than networking a pair of Magix switches with a PRI (but not as cool).
Hope that helps some,
-Chris