I think this is called Disney Enchanted Calls.
There is a website and you can "book" a phone call on-line. We did this for DD dance recital two years ago. We had Belle call DD to tell her congratulations and that her parents were proud of her.
It is a pre-record voice, but they plug in your child's name and you choose among different call topics (holidays, birthdays, conratulations, etc.). It's really pretty cute.