BTECH is Right, DTI Card is for PRI or T-1, You Need a COID (For Caller ID) or COI in order to put Copper Lines on Your System. In Slot 1 That is an ESIB and The Piggy Back Card is an ESIE the Mod Plugs on the Front of the Card are for 8 More Stations making it an 16 Port Card.


"The Only Stupid Question, Is the Question Thats not Asked."