automatic number identification

from The Free On-line Dictionary of Computing (8 July 2008)

Automatic Number Identification
ANI

   <communications> (ANI) A service that tells the recipient of a
   telephone call the telephone number of the person making the
   call.  This number can be passed to computer equipment to
   automatically retrieve associated information about the caller,
   i.e. account status, billing records, etc.

   See {CTI}.

   (1996-12-08)