All of the extensions are 2xx, it's only about a 15 extension system with no extensions above 231, and it doesn't include any odd short codes or ARS alterations. In fact, I've put this same/similar configuration on hundreds of systems without any issues. I thought perhaps there was a local area code or prefix that might begin with 20x, 21x, 22x, or 23x, but there isn't. The ARS table is the default one, and there are only a few extra short codes included that deal with the Auto Attendant and the ?/Dial/. short code.
Anything I might be missing? I don't see anything amiss, there are no individual User Right or User short codes other than the restricted phone set, and as I mentioned this is a very standard configuration for this customer.