Definition[]
Caller ID (also known also as Caller Identification (CID) or more properly Calling Number Identification (CNID), is a telephone service, available on POTS (Plain Old Telephone Service) lines, that transmits a caller's telephone number 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.
Overview[]
Where available, caller ID can also provide a name associated with the calling telephone number, for a higher fee. The information made available to the called party may be made visible on a telephone's own display or on a separate attached device.
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