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C2800 with WIC-1DSU/CSU T1-V2 behavior - ideas?


I'm having some issues regarding connectivity of WIC-1DSU-CSU T1 V2 card on a Cisco 2801 and with SPRINT T1 Smartjacks... right now I have a WIC connected to a T1 smartjack from SPRINT providing frame-relay service and the physical T1 port comes up and everything without any problem (full T1, esf, b8zs) but now SPRINT is providing MPLS with another T1 port on a different smartjack box but that port doesn't come up at all on the router using the same WIC-1DSU/CSU card even though they (i.e SPRINT) can get to the smartjack and everything.

If I connect that smartjack to a VWIC-MFT-T1 card on the same router then the T1 port comes up on the router... what is the difference if any? It should be a T1 port like any other... I would like to have the T1 port on the WIC-1DSU-CSU card instead of the VWIC card.

Any ideas?