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 CNAP or CNAM information is not sent with the call. Rather, the terminating carrier is responsible for providing the Caller ID information to its customer. The terminating carrier performs a database lookup to obtain the 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 are on the order of $0.002 to $0.006 per database dip.[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.