I've always made ADR for Bongos with WDW-DINE. If you have to phone them directly, this is something new.
The only restaurant in DTD that I had to phone directly was RainForest Cafe. We have ADRs at others and made them with WDW-DINE.
I'd just call and ask them. If they can't make if for you, they will give you the number to call.