Kgiles,
DND ON is correct in their answer as you not only have to have the T-1 Circuit Type Correct for a T1 [Loop Start, Ground Start, E&M, DID], but you then also have to have the Service Type correct on the individual trunks themselves.
Loop Start - Bellcore FSK Caller ID or ETSI DTMF Caller ID
Ground Start - Does not support Caller ID
E & M - ANI, *ANI*, *ANI*DNIS*
DID - ANI, *ANI*, *ANI*DNIS*
Remember though that ANI is not Caller ID it is Number Only!
Thanks,
TE