Line information database
Line Information Database (LIDB) is a database used in the United States and Canada by telephone companies to store and retrieve CNAM records used with Caller ID display. Local phone switches, also known as Class 5 switches, use SS7 signaling protocol to query the databases databases.
The caller's name, or CNAM information, is not sent during a call. Rather, the terminating carrier is responsible for providing the Caller ID information to its customer. The terminating carrier performs a database lookup using the caller's phone number to obtain the name information to display with Caller ID. 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.[1] Wholesale rates for the fee are on the order of $0.002 to $0.006 per database dip ($200 to $600 per 100,000 calls).[1]
See also
- Caller ID
- Dip Fee Fraud
- Calling Name Presentation (CNAM)
- Local Number Portability (LNP)
- Location Routing Number (LRN)
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- ^ a b MacIntyre, Doug (February 3, 2014). "Caller ID information wrong". Newsgroup: comp.dcom.telecom. Usenet: WIKdnRBVbcvWzm3PnZ2dnUVZ_oSdnZ2d@giganews.com. Retrieved November 26, 2019.