Unless he is using those 16 analog ports for analog devices for an IVR or something like that so they need CID for additional security? I suppose, he could lose the 2 4TMR's, get one 8T card in slot 3. Get an SL PRI23 card in slot 2 remove one of the large PRI23 cards and replace it with a iDSP card. Of course, you still have to update all the software etc....