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I agree with papyaki. Use a framer that includes the LIU.
I have experience with the Infineon FALC54 (older brother to the 56). Decent app notes to download, and some header files to quickly access the right register. The only complaint I have with the FALC is it feels like the T1 and E1 were two chips slapped onto one silicon. There are registers that are not the same (or have different offsets) based upon if it is in T1 mode or E1 mode. From looking at the Dallas chips datasheets, they seem to have a better handle on combining the T1 and E1 interface from a programmer's stand point, but I have no experience with their products or support.