A DN starting with 'b' designates a conference bridge (i.e. 'b' for Bridge). You should only see these numbers in the finalCalledParty field (though you may see it in originalCalledParty as well, in some instances).
When you see this type of number (starting with a 'b') in the finalCalledParty field, that means that this call record identifies the extension or phone number in the callingPartyNumber field calling into a conference bridge for a conference call. This is quite common, and nothing to be worried about.
See the following document for additional information on CDR fields:
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