I am scheduled to add a DTI card (part # NT7B74AAAA) and a T-1 clock ref card (part # NTBB24GA) to a MICS rel 7.1. I am somewhat familiar with the Norstar but if anyone knows of any road blocks or issues that might arise please let me know. The service is converting 6 existing analog lines to the T-1 along with 1 DID channel, I am also enabiling a PRI code that I purchased from a vendor to enable caller ID.