I figured the loop buttons where the way to go, do you suggest 2 loop buttons or more? Do calls ring in on the loop buttons or are they just for outgoing calls? I am used to avaya IP office with call appearances and those are for any call to come in or out on....So I would normally use 3 but I am not sure how the vertical act.
We also have a pri in the office with the same carrier in our office that I can test with, we can forward our calls to our sip trunks and play with it.