Essentially, when you do a loopback trunk, you have it route to the same place incoming calls go to but without actually leaving your box…
I wish I could post something but I don’t have access to my box right now…
Another thing you could do (instead of a loopback trunk) is this:
I have never done this but if Lorne says this will work I trust him on this…
Personally I prefer the loopback trunk, it’s easier to see what happens and where…
Good luck and have a nice day!
Nick