if I have my area codes all going over the same rout, and the first entry contains my DID rout and the second entry contains my copper (POTS?) rout, then the first path calls will go OUT on is the T1, correct? so the callers will only call OUT on the copper if either all twenty-four channels (no PRI) are busy, or if the T1 is down, right? if my main number ports over the T1 and the T1 is down, how will i get calls IN? (customers trying to call). thank you.