There is no DNC list for a B2B call. However, you must scrub for CELL PHONES if your calling center is using an auto-dialer. And you have to do this every 30 days. It is illegal to dial a cellphone from an auto-dialer without prior opt-in consent. If there is a "click to dial" type option, that removes the problem.

If you hit one of the professional DNC litigants and they find out who you are and that the call center is abroad? They'll sue you (the broker) and the lender, and let your lawyers sort it out. Good luck.