We have a 2811 router with two T1 WICs (wic-1dsu-t1-v2) installed. We would like to add three more WICs. Now the 2811 has 4 WIC slots and an NME slot. Is there some kind of adapter to put WIC slots in teh NME slot, or is there a 2 port T1 WIC, or do we need a new/different router?