Er? Yes? I call the 10 digit number from the mitel 3300 using our T Provider. Oddly, no account code it is needed when I call their DIDs. I can reach any desk in that office by DID. To the best of my knowledge, calls enter on the trucks from my office just like they would for anyone.
The SL extension is on the same node as the hg, And the members. Each office, except mine has one axxess cabinet.
I'm in NY, they're in Illinois.