callbacks >> /ˈkɔːlbak/
Definition: [noun] An invitation to return for a second audition or interview.
Example: he was one of only twelve applicants to receive a callback
Definition: [noun] A phone call made to return one that someone has received.
Example: After placing several calls to one of his handlers, I was more then a little surprised to receive a callback from someone who identified themselves as Tom.
Definition: [noun] A security feature used by some computer systems accessed by phone, in which a user must log on from a previously registered phone number, to which the system then places a return call.