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The line information database (LIDB) is a collection of commercial databases used in the United States and Canada by telephone companies to store and retrieve Calling Name Presentation (CNAM) data used for caller ID services. In Canada, it is common for the client to apply their own Caller ID information, and this is allowed (and common in PBXs), provided the regulations regarding spoofing and fraud are not violated. The databases map telephone numbers to 15-character strings of caller names. Class 5 telephone switches, which provide end-office services in exchange areas, use the Signaling System 7 (SS7) signaling protocol to query the database.

The data submitted to the Line Information Database is maintained by a customer's carrier, and most incumbent local exchange carriers (ILECs) like the Baby Bells, and competitive local exchange carriers (CLECs) provide access for customers. In addition, LIDB databases were available from Intelco, Neustar, TNS, Qwest, Sprint and Verisign in North America. Some carriers do not provide a database, and CNAM lookups are provided using alternate methods, aggregated data from other sources, such as social media.

In the USA, caller ID name information is not transmitted from the originating office to the destination office. It is the terminating carrier that is responsible for providing the caller ID information to its customers. The carrier performs a database lookup using the caller's telephone number to obtain the name information for the caller ID service. If the data is with another carrier, then the terminating carrier must perform a lookup and pay a small dip fee to the carrier hosting the information. Wholesale rates for the fee are on the order of $200 to $600 per 100,000 lookups.

Per carrier policy, the name of a person or business may be automatically added to the Line Information Database and the customer must opt-out to remain anonymous. Other carriers exclude identity information by rule, and require the subscriber to opt-in. If the identity information is not available, then the maintainer of the database often returns geographic information, such as the city and state. In case of a failure, the maintainer of the database may also return "NOT AVAILABLE".

The CNAM databases are independent databases operated by LECs and other private companies. The called party's carrier has the responsibility to perform the CNAM lookup, and it is possible that lookups for the same telephone number from different locations return different name information.

INFO: Full form for L2TPv3 is Layer 2 Tunneling Protocol Version 3 in Telecommunication category

INFO: Full form for LAP-B is Link Access Procedure - Balanced in Telecommunication category

INFO: Full form for LCWN is Livecache Wireless Network in Telecommunication category

INFO: Full form for LACNIC is Latin American and Caribbean Internet Address Registry in Telecommunication category
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INFO: Full form for LACNIC is Latin American and Caribbean Network Information Centre in Telecommunication category
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INFO: Full form for IPvX is Internet Protocol Version X in Telecommunication category

INFO: Full form for ISBX is Internet Satellite Broadcast Exchange in Telecommunication category
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INFO: Full form for M-LEAD is Mouth Lead in Telecommunication category

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INFO: Full form for LQD is Line Quality Disturbance in Telecommunication category
LQD also has other full forms in other categories mentioned below.

INFO: Full form for LCGN is Logical Channel Group Number in Telecommunication category

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INFO: Full form for DTIS is Department of Telecommunications Information Services in Telecommunication category
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INFO: Full form for IEEE-CS is Institute of Electrical and Electronics Engineers Computer Society in Telecommunication category

INFO: Full form for DTIS is Department of Telecommunications and Information Services in Telecommunication category
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INFO: Full form for DSRF is Device Savings Recovery Fee in Telecommunication category
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INFO: Full form for IMPCS is Indian Mobile Personal Communication System in Telecommunication category
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INFO: Full form for IEEE-SA is Institute of Electrical and Electronics Engineers - Standards Association in Telecommunication category

INFO: Full form for DMPB is Digital Multi-point Bridging in Telecommunication category
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INFO: Full form for DSX-2 is Digital Stream Crossconnect 2 (6.312 Mbps) in Telecommunication category

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INFO: Full form for IS 41 is Interim Standard 41 (inter-cellular Network Communication Protocol) in Telecommunication category

INFO: Full form for DUNC is Dial-up Networking Connection in Telecommunication category

INFO: Full form for ILETS is Idaho Law Enforcement Telecommunication System in Telecommunication category
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INFO: Full form for ILETS is International Law Enforcement Telecommunications Seminar in Telecommunication category
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INFO: Full form for DORK is Disciples of The Righteous King in Telecommunication category
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INFO: Full form for DUNCE is Dial-up Networking Connection Enhancement in Telecommunication category

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INFO: Full form for HUACA is Hang Up and Call Again in Telecommunication category

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INFO: Full form for HIDF is Horizontal Intermediate Distributing Frame in Telecommunication category
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INFO: Full form for ISDNUP is Integrated Services Digital Network User Part in Telecommunication category

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INFO: Full form for IOCDS is Input/output Configuration Data Set in Telecommunication category
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INFO: Full form for DMNG is Digital Mobile News Gathering in Telecommunication category

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INFO: Full form for FEBE-I is Far End Block Error Count - Interleaved Data in Telecommunication category

INFO: Full form for FICORA is Finnish Communications Regulatory Authority in Telecommunication category

INFO: Full form for FECC-I is Forward Error Correction Count - Interleaved Data in Telecommunication category

INFO: Full form for FDOA is Frequency Difference of Arrival in Telecommunication category
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