I have ip office v2 500 R7, Question is i have 9 analog lines in it at this time, And i am told they are looking to add two PRI'S to it, first Can i plug them into slots 3 and 4 does it matter, And then do the programing to get the PRI's going and then cut over to thePRI. Or do they have to be in slot 1 of the cabinet..thanks