I use 877-939-3732 (toll free) to make Dining reservations. It is a WDWTC number and option 3 will take you to Dining. IMHO, it's beter to go through Dining than the MS number because Dining is open earlier and often later than MS. Dining is open on both Saturday and Sunday. That can be important if you are trying to get an ADR for a popular restuarant.