I am looking for a service where I can get a number (or a few hundred) for people to call into and then redirect that call to another number with a preemptive recording. I would also need some basic statistics on the calls, such as how many people called each number and when.

Example - I put a number like 480-555-1212 on an ad for teeth whitening and a number like 480-55-2121 on an ad for braces and both calls get forwarded to the dentist at 480-555-8523 but when the receptionist picks up the phone she hears a recording telling her which number was called so she knows if they customer was looking for teeth whitening or braces before she ever talks to them.