It is not that difficult to setup. Just be aware of software version numbers, The newer system support both d4 & b8zs.
The only thing difficult is just figuring the route tables. As stated above, once you understand the relationship it is very straightforward. You should at least read up from a vodavi manual what needs to be set.
With the t1 you need to define the signaling, # of digits coming in, and the route table.


Tip and ring, the work of the devil!