Updating and importing phone numbers in bulk

We have recently used a outside vendor to check the phone numbers in our database and now I have an excel list of 15,000 records with verified and updated phone numbers and phone types. I understand there is no standard utility to do this, and we certainly can't update them manually. I thought I'd ask to see if anyone out there in Tessitura land, has done this kind of a thing before? And how?

Thanks, Ida

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