Method and system for presenting customized call alerts in a service for internet caller identification

An advanced intelligent network (AIN) based system and method that allows a subscriber connected to the Internet to receive customized call alerts and caller identification information concerning an incoming telephone call. Using client software, the subscriber associates telephone numbers to sound files. Then, when an incoming call with caller identification information is received, the client software determines whether the incoming telephone number points to a sound file. If so, the client software directs the sound file to play.