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Caller ID (Caller Identification or CID) is a telephony intelligent network service that transmits the caller's telephone number and (in some places) the caller's name to the called party's telephone equipment during the ringing signal or when the call is being set up but before the call is answered. Typically, CID is transmitted digitally using Bell 202 modulation between the first and second rings.

Telemarketing organisations often block the display of their calling numbers. Some states and countries require telemarketers to display a contact number that can accept complaints, as the individual caller numbers may not be able to be called. Residential phone service.

Many Internet service providers (ISPs) providing dial-up access require the customer to use CLI to prevent abuse of the account by unauthorised callers.

The device is helpful for tracing down prank calls and telemarketers. The concept behind Caller ID is the value of informed consent; however, it also poses problems for personal privacy.

Calling Line Identification

Caller ID is also known as Calling Line Identification (CLI) when provided via an ISDN connection to a PABX, while in some countries, the terms Caller Display, Calling Line Identification Presentation (CLIP), Call capture, or just Calling Line Identity (CLID) are used; Call Display is the predominant marketing name used in Canada (though customers often call it Caller ID). Free Phone.