has anyone installed t-1 co's to a dk280? i have installed point to point t-1 but never co's from at&t
i think i need to use dnis program do i get list of dnis addresses from carrier(at&t)

what you need to do is call at+t ask them how they are setting up the span, (pri, B8zs) etc. and set it up the same way in your system. set up your co trunks as T1 pri with the same signaling they are using . The dnis is sent from the other end it is the des number id sent by the c.o. at the far end you just need to be able to recieve it as such. Read your install book on T1 trunking ,setting up trunks.