I am installing two base stations and six phones overall. Four on the first base, two on the second. I have everything programmed ( BCM 450 ), wired out to the base stations. I assigned the unique ports for the phones and registered them all. I cannot get any of them to work. The display will say " cannot find base station " or something like that. What am I missing? I plan on going back with a T7316 and checking to make certain I have dial tone on all the pairs.