A call detail record (CDR), also known as call data record, is a data record produced by a telephone exchange or other telecommunications equipment documenting the details of a phone call that passed through the facility or device.[1] [2] [3] It is the automated equivalent of the paper toll tickets that were written and timed by operators for long-distance calls in a manual telephone exchange.
A call detail record is composed of data fields that describe the telecommunication transaction, such as[4] [5] :
- the phone number of the subscriber originating the call (calling party)
- the phone number receiving the call (called party)
- the starting time of the call (date and time)
- the call duration
- the billing phone number that is charged for the call
- the identification of the telephone exchange or equipment writing the record
- a sequence number identifying the record
- additional digits on the called number used to route or charge the call
- the disposition or the results of the call, indicating for example whether the called party was busy, or the call failed
- the route by which the call entered the exchange
- the route by which the call left the exchange
- call type (voice, SMS, etc.)
- any fault condition encountered
Each exchange manufacturer decides which information is emitted on the tickets and how it is formatted. Examples:
- Send the timestamp of the end of call instead of duration
- Voice-only machines may not send call type
- Some small PBX does not send the calling party
A station messaging detail record (SMDR) is similar to a CDR, but the most important difference is in the usage[vague].[6]
See also
- Customer proprietary network information
- NSA call database
- Telecommunications data retention
- Pen register
- Internet Protocol Detail Record
- Communications data
- Datacom
- Average call duration
- Answer/seizure ratio
References
- ^ Horak, Ray (2007). Telecommunications and data communications handbook. Hoboken, N.J.: Wiley-Interscience. p. 110-111. ISBN 0470127228.
- ^ Peterson, Kerstin Day (2000). Business telecom systems : a guide to choosing the best technologies and services. New York, NY: CMP Books. p. 412. ISBN 1578200415.
- ^ Petersen, Julie K. (2002). The Telecommunications Illustrated Dictionary. (2nd ed. ed.). Hoboken: CRC Press. p. 147. ISBN 1420040677.
- ^ Peterson, Kerstin Day (2000). Business telecom systems : a guide to choosing the best technologies and services. New York, NY: CMP Books. p. 412. ISBN 1578200415.
- ^ Petersen, Julie K. (2002). The Telecommunications Illustrated Dictionary. (2nd ed. ed.). Hoboken: CRC Press. p. 147. ISBN 1420040677.
- ^ Peterson, Kerstin Day (2000). Business telecom systems : a guide to choosing the best technologies and services. New York, NY: CMP Books. p. 80,81,87,93,118,213,214,218,4 10,411,433,436. ISBN 1578200415.
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