Calling line identification presentation (CLIP) allows the calling party's number and subscriber name to be displayed to the called party. When a call is placed, the originating phone switch sends the caller ID information, which the receiving telephone company looks up in a database to identify the subscriber name. However, caller ID can be blocked, trapped, or spoofed. Blocking prevents display of the caller ID by dialing a code, while trapping still sends the blocked number through the network where it can be identified. Spoofing involves generating fake caller ID information that does not match the actual calling number.