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Caller ID

Caller ID

Caller identification (caller ID) is a telephone service for analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone when the call is being set up. The service may include the transmission of a name associated with the calling telephone.

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Edits on 5 Oct, 2021
Amy Tomlinson Gayle
Amy Tomlinson Gayle edited on 5 Oct, 2021
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Article

Comcast and AT&T have both used the STIR/SHAKEN protocol in existing caller ID and authentication services. Comcast adapted the STIR/SHAKEN protocol to develop a Verified Caller ID feature for the company's Xfinity Voice, Comcast Business Voice, and Business VoiceEdge Select customers. The service works to protect those customers from robocalls and caller ID spoofing, with the service working to validate all calls coming to those customers, and displayingdisplay a Verified label when the service deems the call to be authentic and not spoofed.

...

Similarly, AT&T, which previously offered a Call Protect service whichthat worked to use data analytics on calls and consumer reports in order to evaluate the authenticity of calls, integrated the STIR/SHAKEN protocol into the Call Protect service. The data derived from the protocol is intended to act as another data point in the Call Protect service, to help automatically block calls that the service categorizes as "fraud" and offer warnings for suspected "spam" calls, which AT&T will block in a premium version of the Call Protect Service.

...

In a different direction, Verizon has developed the company's Neighborhood Filter to the company's Call Filter application, which works to block neighborhood spoofing, which is a tactic in which spam callers use a local or neighborhood number to get people to pick up calls. Verizon's solution is to prevent all calls, even legitimate calls, from area codes within a chosen neighborhood, unless the number has been previously saved in a phone. This a further feature of the company's Call Filter service, which works to detect and block calls when Verizon detects a possible spam call, and allows users to report unsolicited numbers and block robocalls based on preferred level of risks. This application is also run on the STIR/SHAKEN protocol to further increase the ability to detect unverified calls.

...

This verification is done using the STIR/SHAKEN framework, which helps providers digitally verify the authenticity of numbers originating and travelling across networks and to verify that the call is coming from the number displayed on the caller ID before the call reaches a consumer. RCD has been used to allow an organization to provide data for an originating call and relies on industry-backed centralized registry, rather than third-party database on the receiving end of the call. This is to further ensure information will only be displayed with verification of the authenticity of the call by the network.

...

T-Mobile's RCD integration with STIR/SHAKEN was tested for a proof-of-concept with participation with First Orion, CTIA, Everbridge, iconectiv, NetNumber, Numeracle, and Twilio. The proof-of-concept was pursued to show the telecommunications and caller ID third-party companies can work together for increased consumer protection and confidence. This is considered an important feature for T-Mobile, which has pointed to data from Pew Research Center, which found 80 percent of adults in the United States do not answer calls if the number is not a known number.

...

These developments also come as T-Mobile's services, including Scam Shield and Metro by T-Mobile which, work to protect consumers from scam calls with automatic scam call warnings. As well, research has shown that T-Mobile's network has been shown to be 30 percent better at detecting scam calls than other major networks.

...

While caller ID displays information about the person calling, it was never intended to stop those calls from occurring. Developers have since created call blocking technology to identify and stop calls from happening once specific criteria is met. These call blocking protocols exist between a third-partythird party as calls are received. Phone companies and applications on mobile devices are able to provide these service as call blocking applications or call screening features.

...

These services work to recognize the source of an incoming call and allow or deny it based on predefined preferences. And, with the increase in smartphone technology, software developers are able to make consistent and incremental improvements and advancements in call blocking, with many applications available that work seamlessly to screen and block phone calls for the user.

...

There is a difference in many cases between blocking calls, which many of these services offer, and flagging them. Call blocking is normally for one-off scenarios for any reasons, while spam flagging seeks to report fraudulent and non-compliant businesses to national databases. This means, as more people flag a phone number, eventually it finds its way into call blocking services automatically, which in turn lessens the workload of individuals creating block lists and can help promote better business practices, as it puts an impetus on a business to monitor the integrity of their phone number operation.

...

Despite caller ID's more widespread consumer adoption not happening until the 1990s, where the inclusion of small screens in telephones for the purpose of screening calls was more widely adopted, the technology was originally developed during the late 1960s and early 1970s. During this period, Theodore Paraskevakos, a Greek immigrant to the United States, patented a new technology whichthat found a way to transfer data via the telephone lines through electronic signals. This technology gave way to transferring specific signals, or words, across telephone lines.

...

By the mid-1970s, a Japanese inventor Kazuo Hashimoto built the first variant of an actual caller ID device. This led to the adoption of caller ID in business and call center applications, before the technology became a popular fixture of home phones. The adoption of cell phones, and eventually smartphones, in the late 1990s and early 200s2000s, came with an increase in the importance of caller ID increased, as it was being made a part of receiving calls and SMS or MMS messages. And with smartphones, it became increasingly odd not to know who was calling.

...

During this time, theThe telephone and telecommunications infrastructure has evolved to include three primary methods for public telecommunications:

...

PSTN is the combination of various telephone networks used by national, regional, and local telephone operators. These networks provide the infrastructure and services for public telecommunications, including telephone lines, cellular networks, satellites, and fiber optic cables. This is considered the infrastructure for making calls. PSTN used to be a network of analog systems whichand has been switched over time to an almost entirely digital network. This switch from analog to digital infrastructure has in turn created vulnerabilities whichthat scam or spoof callers have used.

...

ISDN is similar to PSTN, but with the main difference being that the ISDN network is capable of transferring data as well as speech through multiple location points. This technology was originally developed in the late 1980s, wherewhen the telephone system primarily transferred voice or speech, previous to the development of ISDN, the telephone system primarily transferred voice or speech. The technology is capable of transferring data in packets from location to location through the PSTN network. ISDN involves several types of interfaces, including:

...

The newest of the telecommunication technologies, VoIP uses broadband networks to transport voice communications from the caller to the recipient. This works through the conversion of audio packets of data via codecs whichthat are transmitted over an IP network. VoIP does not rely on the circuit-switched network that phones traditionally use and is considered less expensive for telecommunications companies as a result. VoIP is also the most popular communication method for many internet users.

Timeline

September 27, 2021

Humboldt County SherrifSheriff's Office Warnswarns of Commoncommon Phonephone Scamscam Targetingtargeting Locallocal Residentsresidents.

September 25, 2021

Report: Only one-third of largest phone companies have completely adopted anti-robocall technology.

September 22, 2021

VL Telecom announces a partnership with Truecaller Verified Business Caller ID solution.

September 7, 2021

Caller ID Spoofing Scamspoofing Spreadingscam tospreads otherthrough hospitals in the Houston area.

August 6, 2021

Total Robocallsrobocalls Decreasedecrease by 3% in the Firstfirst Monthmonth of STIR/SHAKEN Releaserelease.

July 28, 2021

Google announcedannounces it's adding new caller ID, missed call, and SMS message features to Google Voice.

July 13, 2021

Verizon's Neighborhoodneighborhood Filterfilter Blocksblocks Spoofedspoofed Numbersnumbers Fromfrom Nearbynearby Areaarea Codescodes.

July 12, 2021

Verizon begins blocking spoofed 'local'"local" robocalls.

June 30, 2021

Karix Mobile partners with Truecaller to offer business caller ID solutions.

June 22, 2021

AT&T Nownow Blockingblocking or Labelinglabeling Moremore Thanthan 1one Billionbillion Robocallsrobocalls Perper Monthmonth.

June 21, 2021

Route Mobile, and Truecaller announce technology partnership

June 5, 2021

Fraud awareness application introduced by HSBC UK, allowsallowing businessbusinesses to track suspicious activities and potential scams.

May 27, 2021

Convoso Launcheslaunches ClearCallerID️ to Armarm Outboundoutbound Callcall Centerscenters with Toolstools that Reducereduce Callcall Blockingblocking and Spamspam Labelinglabeling of Legitlegit Callscalls.

April 15, 2021

Truecaller launches enterprise solutions for businesses.

March 18, 2021

Pindrop Buysbuys Enterpriseenterprise Callcall Verificationverification Techtech Startupstartup Next Caller.

March 9, 2021

Comcast Rollsrolls out Nationnation's Largest Landlinelargest Voicelandline Verifiedvoice-verified Callercaller ID Solutionsolution to Combatcombat Robocallsrobocalls

March 9, 2021

Comcast Introduces Nationwide Verified Caller ID Solution to Combat Landline Robocalls

March 9, 2021

Comcast introduces nationwide verified caller ID solution to combat landline robocalls.

January 27, 2021

Nokia partners with Hiya to stop spam calls.

October 22, 2020

Truecaller introduces a new 'Call"Call Reason': feature for all android users.

October 13, 2020

Caller ID verification announced to be coming to the iPhone.

September 29, 2020

Google Phone app tests Caller ID, auto-deleting Call Screen transcripts.

September 10, 2020

Apple's Silence Unknown Callers feature puts an end to annoying spam calls.

September 8, 2020

Neustar Integratesintegrates with Google Verified Calls to Helphelp Restorerestore Trusttrust in the Phonephone Channelchannel.

July 16, 2020

T-Mobile's 'ScamScam Shield' offers free caller ID and spam call blocking features.

June 30, 2020

FCC tells US telcos to implement caller ID authentication by June 30, 2021.
Amy Tomlinson Gayle
Amy Tomlinson Gayle edited on 5 Oct, 2021
Edits made to:
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Topic thumbnail

Caller ID

Caller identification (caller ID) is a telephone service for analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone when the call is being set up. The service may include the transmission of a name is associated with the calling telephone.

Article

Caller ID, short for caller identification, is a telephone service that transmits a caller's telephone number and the transmission of a name associated with the phone number, to the called person's telephone. The service is available for both analog and digital phone systems, including voice over IP (VoIP). Caller ID was widely introduced in the 1990s and has since become ubiquitous in all telephone services. Especiallyservices—especially with the introduction of smartphones and other telephone services, such as SMS and MMS, which rely on caller ID for identification, along with other applications and services.

...

Caller ID is not regulated by a governing body, such as the Federal Communications Commission. Rather, the services isrun on a patched-together network of decentralized databases whichthat often operate with outdated information. Caller ID works to provide the name and number of a calling party where available, but the definition of caller ID only needs to supply the phone number of the calling party. The usage of it'sits term has made it synonymous with the calling name as well, although this is technically a separate service.

...

The benefits of caller ID includesinclude allowing consumers to know who is calling before they answer the phone, giving them the ability to screen calls and answer important calls while ignoring unimportant or possibly fraudulent calls. Further, caller ID offers consumers a record of recent calls for access to the phone numbers of those who have called, and offeringgives businesses a chance for a callback in appropriate cases. This can be especially helpful in the case where a call has been missed, but the caller has not left a voice message. Furthermore, in a larger context, caller ID allows calls to be tracked and allows the appropriate person to answer a call.

...

Caller ID standards for data transmission and signaling have been published by various standards committees, regulatory agencies, and network carriers. And theyThey tend to fall into one of two categories, based on how the caller ID data is transmitted: FSK modulation or DTMF. While the United Kingdom uses BT and CCA recommendations, British Telecom developed a different recommendation whichthat uses FSK modulations for data transmission. Whereas DTMF-based caller ID is used in countries including Brazil, Belgium, Denmark, Holland, Finland, Iceland, India, the Netherlands, Saudi Arabia, Sweden, and Uruguay.

...

Other countries will have deviations from these main categories, which are available in country-specific PSTN standards. The Telcordia recommendation is used in countries such as the United States, Canada, Australia, China, Hong Kong, New Zealand, and Singapore which, offerswith different data formats and deviations in signal characteristics. These variations are based on the Bellcore FSK standard. And most deviations are based on network transmission interfaces, including power levels and impedances, or timing variations by country.

...

As a result of these regional differences, phonephones purchased in one country may not be compatible with local caller ID standards when used in a different country. For example, the standard used in the United States is the Bellcore FSK, while Taiwan uses ETSI FSK,; so a phone purchased in one country will not understand the other country's caller ID standard. However, caller ID converters for translating between one standard and another are farcan morebe commonutilized to provide a consistent experience. SomeCaller ID standards in specific countries and caller ID standard's include the following:

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Caller ID consists of two user-facing identifiable pieces of information. The first is a phone number, which is also referred to as calling line identification of CLID. This is the public switched telephone number (PSTN) presented as the identification of the caller. The second part is a caller party name, also referred to as CNAM. The information is displayed on a telephone's display, or a separately attached device, through a modem whichthat passes CLID information to a computer for the purposes of call logging and blocking. However, the systems of modems can be different between countries, which can cause hardware and software incompatibilities in international calls. Although most modems are designed and programmed to handle multiple signaling methods for different standards.

...

When CLID, and by extension caller ID, was developed, the world of telephony was primarily a realm of Plain Old Telephone Service (POTS) lines, and the caller information was tied to a Central Office switch whichthat connected the wires. This period had fewer carriers at the time, and caller identification was easy to maintain and store. And, unlike phone numbers or domain name services (DNS), both of which are internationally recognized databases and act as authoritative sources, there is no central authority or regulation for caller ID, which in part creates a vulnerability and capability for caller ID spoofing.

...

For landlines, the displayed number inon caller ID corresponds to the phone number registered with the line. For a PRI or SIP connection, the phone system can control what number is displayed. The caller ID name can also be determined by the receiving carrier. This is done by the receiving carrier querying a CNAM database to determine the name registered to the provided phone number. This allows for the information on calls from a voice over IP (VoIP) system to be modified, with a web interface allowing the caller to edit this information. When routing calls, this feature can make it easier for customers to reference call backcallback numbers and identify potentially important calls.

...

Calling name, also stylized as Calling NAMe and shortened to CNAM, is a third-party service used by carrier to identify and display the name of inbound callers. There is no universal standard for the collection and accuracy of the information in these databases, with multiple possible databasedatabases available to carriers with either redundant or conflicting information based on how maintained a database is. This can create inconsistencies with how names are displayed, with the displayed information varying depending on who receives the call and their phone provider.

...

Dialed number identification service (DNIS) is a service offered by telecommunication network providers to help the call receiver to identify the number the caller dialed. This is done by transmitting the dual tone, multi-frequency digits the caller dialed to a destination where a mechanism decodes the signals and either displays them or makes them available for use by devices at the receiving end.

...

ThisANI is another call center technology that can be used to help impact the customer experience. For example, with ANI services, contact centers are able to route calls based on location, with the area code of the call used to identify its probable location. Or, in a separate scenario, a phone number can be used to query a customer database and the call can be routed according to customer characteristics. ANI can also be used, with a customer database, to provide agents with customer account information with a call, rather than requiring the agent to manually manage the information. This ancan allow an agent to acknowledge the customer and personalize the call.

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Network caller ID (NCID) is an open-source client/server network caller ID package that consists of a server called NCIDD, or NCID daemon; a universal client called NCID,; and multiple client output modules and gateways. The server, NCID, monitors either a modem, device, or gateway for the caller ID data, which is collected and sent, via TCP, to any connected devices. Many devices, including smartphones, and services can detect caller ID information. An NCID gateway collects the caller ID data from these sources and passes it on to the main NCID server. From there, the caller ID data is distributed to all connected clients, similar to caller ID information collected from a traditional modem.

...

One example of a non-modem device is voice overvoiceover IP (VoIP) service that collects caller ID data as SIP packets. Another example is the Whozz Calling series of ethernet link devices that obtain caller ID information from multiple plain old telephone service (POTS) lines.

...

Traditionally, AT-compatible modems expect telecommunications carriers to send caller ID data as either single data message format (SDMF) or multiple data message format (MDMF). The modem then decodes the data stream into human readable text, which the NCID server can then parse. And, if supported by a modem, an NCID server can also decode the raw SDMF or MDMF data stream.

...

For outbound calls, the use of software can change and present a specific caller ID for outbound calls. In the case of a third-party call center, this can be to present the appropriate business name and call backcallback number. This can also present a chance for a business to even provide a reason for calling in some cases. The use of outbound caller ID can increase call pickup rates and improve brand recognition in some cases.

...

As well, with an increased use of SMS in CRM software, and with smartphones offering a chance to display a caller ID when sending an SMS message to a consumer., Thishas cancome alsoan increase in consumer trust when receiving an SMS message from a business, and an increase in interaction rates.

...

While there are legitimate purposes for altering caller ID information when placing a call, suchcall—such as a call center placing calls on behalf of multiple clients whichwho wish to have the accurate information displayed for a client, or a doctor using a general call back number for display when calling a patient for directing future inquiries, thereinquiries—there has also been an increase in caller ID spoofing for scam call and fraudulent call purposes. This has become one of the largest complaints to communications commissions, such as Canada's Canadian Radio-Television and Telecommunications Commission (CRTC) and the United States' Federal Communications Commission (FCC).

...

Caller ID spoofing is the act of a specific person or group changing the information that appears on the caller ID display to misrepresent themselves and trick those answering the call. ThisSpoofing can be done whenin the following ways:

  • The caller ID may display a users'user's own phone number, a practice also known as mirroring
...

The Secure Telephone Identity Revisited and Signature-based Handling of Asserted Information Using toKENs (STIR/SHAKEN) protocol proposed and included in the TRACED act is inspired by the HTTPS web communication protocol and is an attempt to apply the same approach from web browsers to telephones. However, the proposal has been considered by some to have two major drawbacks. The first is that the STIR/SHAKEN protocol requires a public key infrastructure (PKI), which can be an expensive infrastructure to set up and to maintain. And, regardless of the cost and possible operational issues associated with a PKI, whowhich acts as a globally trusted certificate authority, is also unclear. The second is that the STIR/SHAKEN protocol is designed to work with the SIP system for VoIP, leaving SS7 systems (landline and mobile phones) out of scope, which has been perceived to limit the overall effectiveness of the proposed protocol.

...

The STIR/SHAKEN protocol works by using a cryptographic certificate to sign a caller's ID. Calls are signed by the telecommunication network where the call originated, and are intended to be verified by the voice provider whichthat connects the call, and done through a third-party remotely-hosted certificate repository. Work on the protocol began in the mid-2010s, with an adoption rate increasing in 2018 when the FCC imposed a hard deadline for the adoption of the STIR/SHAKEN protocol and more robust authentication inside telecommunications.

...

An alternative method has been created to achieve end-to-end authentication of caller IDs for both SIP and SS7 systems without requiring any PKI. One such idea has been to leverage the DTMF signaling in a call-back session as a trusted channel to send code to the caller, in conjunction with a password authenticated key exchange (PAKE) protocol to perform a key exchange over the data channel, in order to establish a shared high-entropy session key used to authenticate the caller ID end-to-end.

Golden AI"Infobox creation from: Wikidata data enrichment"
Golden AI approved a suggestion from Golden's AI on 5 Oct, 2021
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Aleksander Holm
Aleksander Holm edited on 5 Oct, 2021
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Article
Caller ID for call centers and customer relationship management

Caller ID integrated into customer relationship management (CRM) software has increased in use as it offers a chance for companies and call centers to develop a more efficient service pathway with greater personalization. Using caller ID for inbound calls offers a chance to identify a customer's identity before an agent answers the call. This can, depending on the integration, display the caller's name, email address, where they work, and even a complete interaction history.

For outbound calls, the use of software can change and present a specific caller ID for outbound calls. In the case of a third-party call center, this can be to present the appropriate business name and call back number. This can also present a chance for a business to even provide a reason for calling in some cases. The use of outbound caller ID can increase call pickup rates and improve brand recognition in some cases.

As well, with an increased use of SMS in CRM software, and with smartphones offering a chance to display a caller ID when sending an SMS message to a consumer. This can also increase consumer trust when receiving an SMS message from a business, and increase interaction rates.

...

The Secure Telephone Identity Revisited and Signature-based Handling of Asserted Information Using toKENs (STIR/SHAKEN) protocol proposed and included in the TRACED act is inspired by the HTTPS web communication protocol and is an attempt to apply the same approach from web browsers to telephones. However, the proposal has been considered by some to have two major drawbacks. The first is that the STIR/SHAKEN protocol requires a public key infrastructure (PKI) which can be an expensive infrastructure to set up and to maintain. And, regardless of the cost and possible operational issues associated with a PKI, who acts as a globally trusted certificate authority is also unclear. The second is that the STIR/SHAKEN protocol is designed to work with the SIP system for VoIP, leaving SS7 systems (landline and mobile phones) out of scope, which has been perceived to limit the overall effectiveness of the proposed protocol.

...
Caller ID for call blocking
Comcast and AT&T

Comcast and AT&T have both used the STIR/SHAKEN protocol in existing caller ID and authentication services. Comcast adapted the STIR/SHAKEN protocol to develop a Verified Caller ID feature for the company's Xfinity Voice, Comcast Business Voice, and Business VoiceEdge Select customers. The service works to protect those customers from robocalls and caller ID spoofing, with the service working to validate all calls coming to those customers, and displaying a Verified label when the service deems the call to be authentic and not spoofed.

Similarly, AT&T, which previously offered a Call Protect service which worked to use data analytics on calls and consumer reports in order to evaluate the authenticity of calls, integrated the STIR/SHAKEN protocol into the Call Protect service. The data derived from the protocol is intended to act as another data point in the Call Protect service, to help automatically block calls that the service categorizes as "fraud" and offer warnings for suspected "spam" calls, which AT&T will block in a premium version of the Call Protect Service.

Verizon

In a different direction, Verizon has developed the company's Neighborhood Filter to the company's Call Filter application, which works to block neighborhood spoofing, which is a tactic in which spam callers use a local or neighborhood number to get people to pick up calls. Verizon's solution is to prevent all calls, even legitimate calls, from area codes within a chosen neighborhood unless the number has been previously saved in a phone. This a further feature of the company's Call Filter service, which works to detect and block calls when Verizon detects a possible spam call, and allows users to report unsolicited numbers and block robocalls based on preferred level of risks. This application is also run on the STIR/SHAKEN protocol to further increase the ability to detect unverified calls.

T-Mobile and Rich Call Data

T-Mobile has developed similar STIR/SHAKEN integrations into the company's proprietary offerings. One such integration has included the use of Rich Call Data (RCD). This technology is used to show details such as branding of a company calling for the person called, and this information is expected to also allow those organizations include a "why" they are calling. This has been used as well in combination with the STIR/SHAKEN protocol to provide a further level of call authentication.

This verification is done using the STIR/SHAKEN framework, which helps providers digitally verify the authenticity of numbers originating and travelling across networks and to verify that the call is coming from the number displayed on the caller ID before the call reaches a consumer. RCD has been used to allow an organization to provide data for an originating call and relies on industry-backed centralized registry rather than third-party database on the receiving end of the call. This is to further ensure information will only be displayed with verification of the authenticity of the call by the network.

T-Mobile's RCD integration with STIR/SHAKEN was tested for a proof-of-concept with participation with First Orion, CTIA, Everbridge, iconectiv, NetNumber, Numeracle, and Twilio. The proof-of-concept was pursued to show the telecommunications and caller ID third-party companies can work together for increased consumer protection and confidence. This is considered an important feature for T-Mobile, which has pointed to data from Pew Research Center which found 80 percent of adults in the United States do not answer calls if the number is not a known number.

These developments also come as T-Mobile's services, including Scam Shield and Metro by T-Mobile which work to protect consumers from scam calls with automatic scam call warnings. As well, research has shown that T-Mobile's network has been shown to be 30 percent better at detecting scam calls than other major networks.

Further call authentication strategies
Infobox
Country
Timeline

September 25, 2021

Report: Only one-third of largest phone companies have completely adopted anti-robocall technology

August 6, 2021

Total Robocalls Decrease by 3% in the First Month of STIR/SHAKEN Release

July 13, 2021

Verizon's Neighborhood Filter Blocks Spoofed Numbers From Nearby Area Codes

June 22, 2021

AT&T Now Blocking or Labeling More Than 1 Billion Robocalls Per Month

June 21, 2021

Route Mobile, Truecaller announce technology partnership

June 5, 2021

Fraud awareness application introduced by HSBC UK, allows business to track suspicious activities and potential scams.

May 11, 2021

Five9 Partners with Neustar to support STIR/SHAKEN framework for restoring trust in voice communication.

March 18, 2021

Pindrop Buys Enterprise Call Verification Tech Startup Next Caller.

March 9, 2021

Comcast Introduces Nationwide Verified Caller ID Solution to Combat Landline Robocalls

January 27, 2021

Nokia partners with Hiya to stop spam calls

September 9, 2020

Google's new phone application feature ID's legitimate business calls.

September 8, 2020

Neustar Integrates with Google Verified Calls to Help Restore Trust in the Phone Channel

August 14, 2019

AT&T and T-Mobile fight caller ID spoofing with number verification system.
Edits on 4 Oct, 2021
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Aleksander Holm
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Topic thumbnail

Caller ID

Caller identification (caller ID) is a telephone service for analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone when the call is being set up. The service may include the transmission of a name is associated with the calling telephone.

Article
Overview

Caller ID, short for caller identification, is a telephone service that transmits a caller's telephone number and the transmission of a name associated with the phone number, to the called person's telephone. The service is available for both analog and digital phone systems, including voice over IP (VoIP). Caller ID was widely introduced in the 1990s and has since become ubiquitous in all telephone services. Especially with the introduction of smartphones and other telephone services, such as SMS and MMS, which rely on caller ID for identification, along with other applications and services.

Caller ID is not regulated by a governing body such as the Federal Communications Commission. Rather, the services is a patched-together network of decentralized databases which often operate with outdated information. Caller ID works to provide the name and number of a calling party where available, but the definition of caller ID only needs to supply the phone number of the calling party. The usage of it's term has made it synonymous with the calling name as well, although this is technically a separate service.

Benefits of caller ID

The benefits of caller ID includes allowing consumers to know who is calling before they answer the phone, giving them the ability to screen calls and answer important calls while ignoring unimportant or possibly fraudulent calls. Further, caller ID offers consumers a record of recent calls for access to the phone numbers of those who have called, and offering businesses a chance for a callback in appropriate cases. This can be especially helpful in the case where a call has been missed but the caller has not left a voice message. Furthermore, in a larger context, caller ID allows calls to be tracked and allows the appropriate person to answer a call.

For corporations, caller ID also offers an opportunity to develop a caller database and learn more about customers through caller data. As well, the data can be used to personalize the customer experience and increase the appeal to different customers. This can include using a caller ID solution to ensure a business makes an impression on the consumer it is calling right from the caller ID display, before the call has been answered.

Differences by region

Caller ID standards for data transmission and signaling have been published by various standards committees, regulatory agencies, and network carriers. And they tend to fall into one of two categories, based on how the caller ID data is transmitted: FSK modulation or DTMF. While the United Kingdom uses BT and CCA recommendations, British Telecom developed a different recommendation which uses FSK modulations for data transmission. Whereas DTMF-based caller ID is used in countries including Brazil, Belgium, Denmark, Holland, Finland, Iceland, India, the Netherlands, Saudi Arabia, Sweden, and Uruguay.

Other countries will have deviations from these main categories which are available in country-specific PSTN standards. The Telcordia recommendation is used in countries such as the United States, Canada, Australia, China, Hong Kong, New Zealand, and Singapore which offers different data formats and deviations in signal characteristics. These variations are based on the Bellcore FSK standard. And most deviations are based on network transmission interfaces, including power levels and impedances, or timing variations by country.

As a result of these regional differences, phone purchased in one country may not be compatible with local caller ID standards when used in a different country. For example, the standard used in the United States is the Bellcore FSK, while Taiwan uses ETSI FSK, so a phone purchased in one country will not understand the other country's caller ID standard. However, caller ID converters for translating between one standard and another are far more common to provide a consistent experience. Some countries and caller ID standard's include:

Regional differences in caller ID standards

Country
Caller ID standard

Brazil

Bellcore FSK/V23 FSK/DTMF

Canada

Bellcore FSK

China

Bellcore FSK/DTMF

Hong Kong

Bellcore FSK

Ireland

ETSI FSK V23 (ETS 300 659-1)

Caller ID technologies
Calling line identification

Caller ID consists of two user-facing identifiable pieces of information. The first is a phone number, which is also referred to as calling line identification of CLID. This is the public switched telephone number (PSTN) presented as the identification of the caller. The second part is a caller party name, also referred to as CNAM. The information is displayed on a telephone's display, or a separately attached device, through a modem which passes CLID information to a computer for the purposes of call logging and blocking. However, the systems of modems can be different between countries, which can cause hardware and software incompatibilities in international calls. Although most modems are designed and programmed to handle multiple signaling methods for different standards.

When CLID, and by extension caller ID, was developed, the world of telephony was primarily a realm of Plain Old Telephone Service (POTS) lines, and the caller information was tied to a Central Office switch which connected the wires. This period had fewer carriers at the time, and caller identification was easy to maintain and store. And, unlike phone numbers or domain name services (DNS), both of which are internationally recognized databases and act as authoritative sources, there is no central authority or regulation for caller ID, which in part creates a vulnerability and capability for caller ID spoofing.

For landlines, the displayed number in caller ID corresponds to the phone number registered with the line. For a PRI or SIP connection, the phone system can control what number is displayed. The caller ID name can also be determined by the receiving carrier. This is done by the receiving carrier querying a CNAM database to determine the name registered to the provided phone number. This allows for the information on calls from a voice over IP (VoIP) system to be modified, with a web interface allowing the caller to edit this information. When routing calls, this feature can make it easier for customers to reference call back numbers and identify potentially important calls.

Calling Name (CNAM)

Calling name, also stylized as Calling NAMe and shortened to CNAM, is a third-party service used by carrier to identify and display the name of inbound callers. There is no universal standard for the collection and accuracy of the information in these databases, with multiple possible database available to carriers with either redundant or conflicting information based on how maintained a database is. This can create inconsistencies with how names are displayed, with the displayed information varying depending on who receives the call and their phone provider.

For those companies maintaining CNAMs, they maintain a private database on the phone number and name pairs in the United States and abroad. A caller ID outputs up to 15 ASCII characters to display a name, and a typical display name is 9 to 12 characters, while the phone number is usually displayed as a ten-digit number.

Dialed number identification service (DNIS)

Dialed number identification service (DNIS) is a service offered by telecommunication network providers to help the call receiver to identify the number the caller dialed. This is done by transmitting the dual tone multi-frequency digits the caller dialed to a destination where a mechanism decodes the signals and either displays them or makes them available for use by devices at the receiving end.

This technology is useful for contact centers, where a PBX receives calls dialed to different 800 or 900 numbers on the same port. The DNIS data would contained the dialed number, and enable the PBX to track the call. Integrating call processing and call routing with the associated data then helps with the possibility for first call resolution and an improved customer experience and satisfaction.

Automatic number identification (ANI)

Automatic number identification (ANI) is a service that allows the receiver of a phone call to capture and display the phone number of the originating call and is mainly used for billing purposes. Previous to this service, telephone operators would have to request the number of a calling party for a toll call. ANI is somewhat similar to caller ID in function, but the underlying technology is different. Although the method of transmitting phone number data differs based on the service provider, it is often sent as a digital tone with the phone call. ANI is also more resistant to blocking than traditional caller ID systems.

This is another call center technology that can be used to help impact the customer experience. For example, with ANI services, contact centers are able to route calls based on location, with the area code of the call used to identify its probable location. Or, in a separate scenario, a phone number can be used to query a customer database and the call can be routed according to customer characteristics. ANI can also be used, with a customer database, to provide agents with customer account information with a call, rather than requiring the agent to manually manage the information. This an allow an agent to acknowledge the customer and personalize the call.

Network caller ID (NCID)

Network caller ID (NCID) is an open-source client/server network caller ID package that consists of a server called NCIDD, or NCID daemon; a universal client called NCID, and multiple client output modules and gateways. The server, NCID, monitors either a modem, device, or gateway for the caller ID data, which is collected and sent, via TCP, to any connected devices. Many devices, including smartphones, and services can detect caller ID information. An NCID gateway collects the caller ID data from these sources and passes it on to the main NCID server. From there, the caller ID data is distributed to all connected clients, similar to caller ID information collected from a traditional modem.

One example of a non-modem device is voice over IP (VoIP) service that collects caller ID data as SIP packets. Another example is the Whozz Calling series of ethernet link devices that obtain caller ID information from multiple plain old telephone service (POTS) lines.

Protocol

The NCID protocol is a simple, human-readable ASCII text consisting of field pairs, which includes a field label and the labels associated field data, using an asterisk character as a delimiter. Transmission between the NCID server and its clients is usually done through TCP or IP, and usually over port 3333. Additional field pairs have been added as the NCID servers have been enhanced with new features and support for more devices. NCID servers can also be enhanced with hardware that can supply caller ID data through a NCID server accessing device directly through the RS232 serial port or through USB, or can be accessed indirectly through NCID gateways, which are usually scripts and programs included with an NCID package.

Modems

Traditionally, AT-compatible modems expect telecommunications carriers to send caller ID data as either single data message format (SDMF) or multiple data message format (MDMF). The modem then decodes the data stream into human readable text, which the NCID server can then parse. And, if supported by a modem, an NCID server can also decode the raw SDMF or MDMF data stream.

Companies offering Caller ID services

Caller ID Spoofing

While there are legitimate purposes for altering caller ID information when placing a call, such as a call center placing calls on behalf of multiple clients which wish to have the accurate information displayed for a client, or a doctor using a general call back number for display when calling a patient for directing future inquiries, there has also been an increase in caller ID spoofing for scam call and fraudulent call purposes. This has become one of the largest complaints to communications commissions, such as Canada's Canadian Radio-Television and Telecommunications Commission (CRTC) and the United States' Federal Communications Commission (FCC).

Caller ID spoofing is the act of a specific person or group changing the information that appears on the caller ID display to misrepresent themselves and trick those answering the call. This can be done when:

  • The caller ID may be altered to match the first 6-digits of a telephone number to look like a local call, even a call from a neighbor, a practice also known as neighboring
  • The caller ID may display a users' own phone number, a practice also known as mirroring
  • The caller ID may display the number of another individual or another organization to pose as a recognizable brand or person
  • The caller ID may be altered to represent a number that cannot be dialed with the telephone network

The changing technologies of telephone networking, especially the development of VoIP services, have also offered new technologies for caller ID spoofing and scammers using these technologies to trick consumers. Previously, telecommunication networks had tighter regulations and fewer problems with scammers and the large telecommunication companies dominated these networks and helped reduce the possibility of caller ID spoofing. VoIP services also saw many telecommunication companies enter the marketplace without the infrastructure necessary to protect consumers from robocalls or else they ignored the problem. In 2018 alone, it was reported that Americans received 26.3 billion robocalls.

The increase in robocalls and scam calls using caller ID spoofing has led to governments working with telecommunication companies to implement call authentication technologies to combat the caller ID spoofing. One of these call authentication technologies is the STIR/SHAKEN protocol, which works to provide a technological framework for carriers to authenticate calls at the source and warn consumers about potentially fraudulent callers before a consumer picks up the call.

Telecommunication companies have also begun using data metrics in order to pinpoint locations and bad actors likely to spoof caller ID in order to steal personal and financial information from consumers. As part of this, the TRACED act, which mandated that the STIR/SHAKEN protocol needed to be adopted by all carriers by June 2021 in the United States, also mandated the customers should receive robocall blocking at no additional charge. The act also gave the FCC an opportunity to push telecommunication companies for other technical solutions to block unwanted calls for consumers.

STIR/SHAKEN

The STIR/SHAKEN protocol proposed and included in the TRACED act is inspired by the HTTPS web communication protocol and is an attempt to apply the same approach from web browsers to telephones. However, the proposal has been considered by some to have two major drawbacks. The first is that the STIR/SHAKEN protocol requires a public key infrastructure (PKI) which can be an expensive infrastructure to set up and to maintain. And, regardless of the cost and possible operational issues associated with a PKI, who acts as a globally trusted certificate authority is also unclear. The second is that the STIR/SHAKEN protocol is designed to work with the SIP system for VoIP, leaving SS7 systems (landline and mobile phones) out of scope, which has been perceived to limit the overall effectiveness of the proposed protocol.

The STIR/SHAKEN protocol works by using a cryptographic certificate to sign a caller's ID. Calls are signed by the telecommunication network where the call originated, and are intended to be verified by the voice provider which connects the call, and done through a third-party remotely-hosted certificate repository. Work on the protocol began in the mid-2010s, with an adoption rate increasing in 2018 when the FCC imposed a hard deadline for the adoption of the STIR/SHAKEN protocol and more robust authentication inside telecommunications.

United States telecommunications companies began testing the protocols in their networks, with AT&T and Comcast announcing the first successful STIR/SHAKEN-authenticated call between two different networks in March 2019.

An alternative method to achieve end-to-end authentication of caller IDs for both SIP and SS7 systems without requiring any PKI. One such idea has been to leverage the DTMF signaling in a call-back session as a trusted channel to send code to the caller, in conjunction with a password authenticated key exchange (PAKE) protocol to perform a key exchange over the data channel in order to establish a shared high-entropy session key used to authenticate the caller ID end-to-end.

Caller ID for call blocking

While caller ID displays information about the person calling, it was never intended to stop those calls from occurring. Developers have since created call blocking technology to identify and stop calls from happening once specific criteria is met. These call blocking protocols exist between a third-party as calls are received. Phone companies and applications on mobile devices are able to provide these service as call blocking applications or call screening features.

These services work to recognize the source of an incoming call and allow or deny it based on predefined preferences. And, with the increase in smartphone technology, software developers are able to make consistent and incremental improvements and advancements in call blocking, with many applications available that work seamlessly to screen and block phone calls for the user.

There is a difference in many cases between blocking calls, which many of these services offer, and flagging them. Call blocking is normally for one-off scenarios for any reasons, while spam flagging seeks to report fraudulent and non-compliant businesses to national databases. This means, as more people flag a phone number, eventually it finds its way into call blocking services automatically, which in turn lessens the workload of individuals creating block lists and can help promote better business practices, as it puts an impetus on a business to monitor the integrity of their phone number operation.

History of Caller ID

Despite caller ID's more widespread consumer adoption not happening until the 1990s, where the inclusion of small screens in telephones for the purpose of screening calls was more widely adopted, the technology was originally developed during the late 1960s and early 1970s. During this period, Theodore Paraskevakos, a Greek immigrant to the United States, patented a new technology which found a way to transfer data via the telephone lines through electronic signals. This technology gave way to transferring specific signals, or words, across telephone lines.

By the mid-1970s, a Japanese inventor Kazuo Hashimoto built the first variant of an actual caller ID device. This led to the adoption of caller ID in business and call center applications, before the technology became a popular fixture of home phones. The adoption of cell phones, and eventually smartphones, in the late 1990s and early 200s, the importance of caller ID increased, as it was being made a part of receiving calls and SMS or MMS messages. And with smartphones it became increasingly odd not to know who was calling.

Evolving telecommunications

During this time, the telephone and telecommunications infrastructure has evolved to include three primary methods for public telecommunications:

  • Public switched telephone network (PSTN)
  • Integrated services digital network (ISDN)
  • IP Telephone/voice over IP (VoIP)
PSTN

PSTN is the combination of various telephone networks used by national, regional, and local telephone operators. These networks provide the infrastructure and services for public telecommunications, including telephone lines, cellular networks, satellites, and fiber optic cables. This is considered the infrastructure for making calls. PSTN used to be a network of analog systems which has been switched over time to an almost entirely digital network. This switch from analog to digital infrastructure has in turn created vulnerabilities which scam or spoof callers have used.

The PSTN works through a network of "switches" that route calls from one destination to the next. Once the call is engaged on a landline or traditional cellular service, the call is handed off through several destinations, which include fiber optic cables, cellular towers, and satellites. These networks then transfer the communications from one location to the next. The United Kingdom has already committed to retiring the country's PSTN in 2025 and replace it with a digital "all-IP" network.

ISDN

ISDN is similar to PSTN, but with the main difference being that the ISDN network is capable of transferring data as well as speech through multiple location points. This technology was originally developed in the late 1980s, where, previous to the development of ISDN, the telephone system primarily transferred voice or speech. The technology is capable of transferring data in packets from location to location through the PSTN network. ISDN involves several types of interfaces, including:

  • Basic rate interface (BRI)
  • Broadband ISDN (B-ISDN)
  • Narrowband ISDN (N-ISDN)
  • Primary rate interface (PRI)
...

One of the benefits of ISDN, compared to PSTN, is the ability to transfer data and make calls clearer, and the network technology has since become a preferred communications method for many telecommunications companies.

VoIP

The newest of the telecommunication technologies, VoIP uses broadband networks to transport voice communications from the caller to the recipient. This works through the conversion of audio packets of data via codecs which are transmitted over an IP network. VoIP does not rely on the circuit-switched network that phones traditionally use and is considered less expensive for telecommunications companies as a result. VoIP is also the most popular communication method for many internet users.

Table

Title
Author
Link
Type
Date

Call Authentication is Necessary for the Modern Telephony Network

Web

August 26, 2020

Caller ID Spoofing | CRTC

Web

April 7, 2021

FCC tells US telcos to implement caller ID authentication by June 30, 2021

Catalin Cimpanu

Web

March 31, 2020

Frequently Asked Questions About Caller ID

Web

Infobox
Country
Also known as
Caller identificationCalling line identification
Parent industry
Categories
Timeline

October 4, 2021

Spoofing scams are Metro Bank's October scams of the month.

September 29, 2021

Phone companies must now block carriers that didn't meet FCC robocall deadline.

September 29, 2021

Cybercriminals bypass 2FA and OTP with robocalling and Telegram bots

September 27, 2021

Humboldt County Sherrif's Office Warns of Common Phone Scam Targeting Local Residents

September 22, 2021

VL Telecom announces partnership with Truecaller Verified Business Caller ID solution

September 15, 2021

Truecaller is looking to raise $116 million in an initial public offering on Nasdaq Stockholm.

September 7, 2021

Caller ID Spoofing Scam Spreading to other hospitals in the area

July 28, 2021

Google announced it's adding new caller ID, missed call, and SMS message features to Google Voice.

July 26, 2021

Legitimate businesses, telephone companies now have more options to present verified caller ID to consumers.

July 12, 2021

Verizon begins blocking spoofed 'local' robocalls.

June 30, 2021

Karix Mobile partners Truecaller to offer business caller ID solutions

June 17, 2021

Ooma Caller info match, a new feature for Ooma Office Pro, automatically displays in-depth caller profiles.

June 2021

T-Mobile enhances caller ID in proof-of-concept.

May 27, 2021

Convoso Launches ClearCallerID️ to Arm Outbound Call Centers with Tools that Reduce Call Blocking and Spam Labeling of Legit Calls

May 5, 2021

HSBC UK reports that biometric verification with its caller ID program, Voice ID, reduced bank fraud by 50%.

April 20, 2021

The U.S. Attorney's Office warns that scammers are "spoofing" the office phone number to try to obtain money or personally identifiable information.

April 20, 2021

The FCC is going to hold providers accountable for anti-robocall efforts

April 15, 2021

Truecaller launches enterprise solutions for businesses

March 25, 2021

T-Mobile announces the next milestone in its leading Scam Shield Un-carrier move to protect customers from invasive scams and unwanted robocalls.

March 23, 2021

Sevis Systems announces the release of Trusted Caller ID for its eCallMe! hybrid call verification and customer engagement platform.

March 18, 2021

Caller ID authentication is expected to tame the scourge of spam calls.

March 9, 2021

Comcast Rolls out Nation's Largest Landline Voice Verified Caller ID Solution to Combat Robocalls

2021

Truecaller's Alan Mamedi says half the Indian smartphones have the company's caller ID application.

November 23, 2020

Technology companies complete first-ever telephone call with authenticated caller ID and rich call data, powered by STIR/SHAKEN.

October 22, 2020

Truecaller introduces a new 'Call Reason' feature for all android users

October 13, 2020

Caller ID verification announced to be coming to the iPhone

September 29, 2020

Google Phone app tests Caller ID, auto-deleting Call Screen transcripts

September 10, 2020

Apple's Silence Unknown Callers feature puts an end to annoying spam calls

July 16, 2020

T-Mobile's 'Scam Shield' offers free caller ID and spam call blocking features.

June 30, 2020

FCC tells US telcos to implement caller ID authentication by June 30, 2021

November 2019

With Google Cloud's Speaker ID, callers can now use their voice for authentication.

May 29, 2018

The FCC fines San Diego-based telemarketer nearly $10 million for spoofed caller ID.

February 13, 2017

Yahoo Mail's mobile application capable of offering caller ID and syncing photos.
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Edits on 27 Sep, 2021
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Title
Author
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Type
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How STIR/SHAKEN is Mixing Up and Stopping Phone Scammers | FTC

Web

February 19, 2020

Edits on 24 Sep, 2021
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 Caller ID

Caller identification (caller ID) is a telephone service for analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone when the call is being set up. The service may include the transmission of a name associated with the calling telephone.

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