Hi jonathanr. First, welcome to the board. As for your step by step request, without seeing your system to know more about it, that could be a tricky request. Essentially what you want to do is have your trunks ring into a Call Routing Table. Then set up the table. F1 in DB Studio will give you the info on setting up the table, but it may be more than you want to tackle if you're not familiar with the process. If you do want to give it a try, your best step by step will be in the manual as you'll get screenshots and other diagrams that you wouldn't get here.
Feel free to post specific questions if you need to though. You might also consider contacting one of the Inter-Tel mods to set it up for you via remote programming. I'm not sure what the hourly rate would be, but it wouldn't take a tech very long to set it up.
I think both bullcube and DnRComm offer remote programming. RCA is currently on vacation.
