If I have a split T-1 12 channels Voice, 12 channels Data, the COnnectivity will not split this, correct? I will have to have a CSU/DSU in front of it and only send the Data side of the T-1 to the router and then I can configure it to only look at the last 12 channels, correct?? Sorry for the simple question, someone else ordered the parts and says "this should be all you need" but I of course have no CSU/DSU so I just don't want to order one if I don't have to have one. Thanks