Caller ID

caller line identificationCaller-IDCalling Line IdentificationCLICaller ID blockingcall displayCall Number DisplayCaller Displaycaller identificationcaller-identification technology
Caller ID (caller identification, CID), also called calling line identification (CLID), Calling Line Identification (CLI), calling number delivery (CND), calling number identification (CNID), calling line identification presentation (CLIP), or call display, is a telephone service, available in analog and digital telephone systems, including VoIP, that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.wikipedia
269 Related Articles

Automatic number identification

ANIautomatic number identification (ANI)the caller's number
The concept of calling number identification as a service for POTS subscribers originated from automatic number identification (ANI) as a part of toll free number service in the United States.
ANI is not related to newer caller ID services such as call display.

Business telephone system

PBXprivate branch exchangePABX
A call placed behind a private branch exchange (PBX) has more options.

Plain old telephone service

POTSLocal Telephone Servicetelephone
The concept of calling number identification as a service for POTS subscribers originated from automatic number identification (ANI) as a part of toll free number service in the United States.
The services include voicemail, Caller ID, call waiting, speed dialing, conference calls (three-way calling), enhanced 911, and Centrex services.

Theodore Paraskevakos

Theodore George “Ted” ParaskevakosTed ParaskevakosTheodore George "Ted" Paraskevakos
In 1968, Theodore George "Ted" Paraskevakos, while working in as a communications engineer for SITA in Athens, Greece, began developing a system to automatically identify a telephone caller to a call recipient.
Paraskevakos' most notable inventions relate to the transmission of electronic data through telephone lines which formed the original basis for what is now known as caller ID.

Kazuo Hashimoto

From 1969 through 1975, Paraskevakos was issued twenty separate patents related to automatic telephone line identification, and since they significantly predated all other similar patents, they appear as prior art in later United States patents issued to Kazuo Hashimoto and Carolyn A. Doughty.
Kazuo Hashimoto was a Japanese inventor who registered over 1,000 patents throughout the world, including patents for Caller-ID system and telephone answering machine.

Line Information Database

LIDB
The name can be passed on by the originating central office, or it is obtained from a Line Information Database by the terminating switch.
The Line Information Database (LIDB) is a commercial database used in the United States and Canada by telephone companies to store and retrieve Calling Name Presentation (CNAM) data used for caller ID services.

Nélio José Nicolai

Later in 1980, two other Brazilian inventors, João da Cunha Doya and Nélio José Nicolai, filed patent applications for other caller ID devices.
1940 – 11 October 2017) was a Brazilian electrotechnician who is believed to have invented caller ID.

Toll-free telephone number

toll-freetoll-free number800 number
The concept of calling number identification as a service for POTS subscribers originated from automatic number identification (ANI) as a part of toll free number service in the United States.
Toll free numbers usually capture the telephone number of the caller for billing purposes through automatic number identification, which is independent of caller ID data and functions even if caller ID is blocked.

Bell 202 modem

Bell 202Bell 202 tones
In 1995, Bellcore released another type of modulation, similar to Bell 202, in which it became possible to transmit caller ID information and even provide call-disposition options while the user was already on the telephone.
In North America, Bell 202 AFSK modulation is used to transmit Caller ID information over POTS lines in the public telephone network.

Caller ID spoofing

spoofspoofedCaller ID
Legislation in the United States in made caller ID spoofing illegal for fraudulent purposes.
This can lead to a caller ID display might display a phone number different from that of the telephone from which the call was placed.

Vertical service code

calling featureservice featureCustom Local Area Signaling Services
Most service providers, however, allow the caller to block caller ID presentation through the vertical service code *67.

Signalling System No. 7

SS7Signaling System 7Signalling System 7
A SS7 (or Signalling System 7) TCAP query may be launched by the called party's central office, in order to retrieve the information for Calling Name delivery to the caller ID equipment at the consumer's location, if the caller's name has not already been associated with the calling party's line at the originating central office.
Some of the first such services were call management related, call forwarding (busy and no answer), voice mail, call waiting, conference calling, calling name and number display, call screening, malicious caller identification, busy callback.

Qwest Corporation

Mountain BellU S WEST CommunicationsMountain States Telephone & Telegraph Company
Bell Atlantic was the second local telephone company to deploy Caller ID in New Jersey's Hudson County, followed by US West Communications (now CenturyLink) in 1989.
U S WEST Communications was the first local telephone company to offer Caller ID service in 1991, nearly four years before any other local telco could do so.

Anonymity

anonymousanonymouslyincognito
Similarly, some countries offer anonymous caller rejection, which rejects all calls when the subscriber's name, number (or both) is blocked.
In work settings, the three most common forms of anonymous communication are traditional suggestion boxes, written feedback, and Caller ID blocking.

Analog Display Services Interface

ADSI
This service became known in some markets as call waiting ID, or (when it was combined with call-disposition options) Call Waiting Deluxe; it is technically referred to as Analog Display Services Interface.
The service is marketed at telephone customers who subscribe to the majority of Custom Local Area Signaling Services (CLASS)-based services offered by their local telephone company (such as caller ID, Call Return, etc.) by the customization of a telephone capable of providing one-touch access to these features.

Frequency-shift keying

FSKfrequency shift keyingAFSK
The technology is used for communication systems such as telemetry, weather balloon radiosondes, caller ID, garage door openers, and low frequency radio transmission in the VLF and ELF bands.

ITU V.23

V.23V23
Instead of Bell 202, the European alternative V.23 is sometimes used, (without the 75-baud reverse channel) or the data is sent using DTMF signalling.
In some European countries, (and perhaps elsewhere), V.23 Mode 2 AFSK modulation, (without the backward channel) is used to transmit Caller ID information over POTS lines in the public telephone network.

STIR/SHAKEN

SHAKEN/STIR
Starting in mid-2017, and with intended culmination in 2019, the FCC pushed forward Caller ID certification implemented via a methodology of SHAKEN/STIR.
This may be in the form of additional information in the CNAM information of caller ID indicating the number has been spoofed, but the details have not been finalized.

Calling Name Presentation

Calling Name DeliveryCNAM dip fee
The fee is called a CNAM dip fee.
The CNAM information is most often displayed in Caller ID.

Dual-tone multi-frequency signaling

DTMFtouch-tonedual-tone multi-frequency
Instead of Bell 202, the European alternative V.23 is sometimes used, (without the 75-baud reverse channel) or the data is sent using DTMF signalling.
This led to the addition of the number sign octothorpe asterisk or "star" keys as well as a group of keys for menu selection: A, B, C and D. In the end, the lettered keys were dropped from most phones, and it was many years before the two symbol keys became widely used for vertical service codes such as *67 in the United States of America and Canada to suppress caller ID.

Voice over IP

VoIPVoice over Internet Protocolvoice-over-IP
Caller ID (caller identification, CID), also called calling line identification (CLID), Calling Line Identification (CLI), calling number delivery (CND), calling number identification (CNID), calling line identification presentation (CLIP), or call display, is a telephone service, available in analog and digital telephone systems, including VoIP, that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.
Voice over IP protocols and equipment provide caller ID support that is compatible with the facility provided in the public switched telephone network (PSTN).

North American Numbering Plan

Area codeArea codesArea code(s)
In North America and some other regions, the code is *67 (1167 rotary dial), while in the United Kingdom and Ireland, it is 141.

Direct inward dial

Direct Inward Dialingdirect inbound dialingDDI
The caller line identification (CLI) or caller-id of extensions for outgoing calls is often set to the extension DID number, but may be the organization's central switch board number.

Telephone

phonetelephonesLocal Telephone Service
Caller ID (caller identification, CID), also called calling line identification (CLID), Calling Line Identification (CLI), calling number delivery (CND), calling number identification (CNID), calling line identification presentation (CLIP), or call display, is a telephone service, available in analog and digital telephone systems, including VoIP, that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.

Calling party

callercall originatorA-Number
Caller ID (caller identification, CID), also called calling line identification (CLID), Calling Line Identification (CLI), calling number delivery (CND), calling number identification (CNID), calling line identification presentation (CLIP), or call display, is a telephone service, available in analog and digital telephone systems, including VoIP, that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.