Retrieve Data via Phone

I am looking for someone who can help me design a solution for interfacing with a database over the phone. For example, I want to be able to call into a server, enter a code (for example, an order number) which would trigger a query to the DB and return the result (either spoken or a series of wav files). Does anyone have experience with this type of thing? What kind of hardware/software would this require? Note: The bid is just for consulting services... if you're capable of developing this solution, we would obviously work out a separate arrangement following the consultation.