Call detail records (CDRs) detail the called number, the number that places the call, the date and time that the call starts, the time that the call connects, and the time that the call ends. Call management records (CMRs), or diagnostic records, detail the jitter, lost packets, the amount of data sent and received during the call, and latency. CDR data comprises CDRs and CMRs collectively. A single call can result in the generation of several CDRs and CMRs. Cisco Unified Communications Manager records information regarding each call in CDRs and CMRs. CDRs and CMRs, known collectively as CDR data, serve as the basic information source for CAR.
The Cisco CDR Agent service transfers CDR and CMR files that Cisco Unified Communications Manager generates from the local host to the CDR repository node, where the CDR Repository Manager service runs over a SFTP connection. If the SFTP connection fails, the Cisco CDR Agent services continue to make connection attempts to the CDR repository node until a connection is made. The Cisco CDR Agent service sends any accumulated CDR files when the connection to the CDR Repository node resumes. The CDR Repository Manager service maintains the CDR and CMR files, allocates the amount of disk space for use by CMRs and CDRs, sends the files to up to three configured destinations, and tracks the delivery result for each destination. CAR accesses the CDR/CMR files in the directory structure that the CDR Repository Manager service creates.
The high and low water mark settings that you configure specify percentages of the total disk space that are allocated for the CDR repository. Although the preserved folder under the CDR repository folder contributes to the high and low water mark percentages, Log Partition Monitoring never deletes the folder if the high water mark gets reached. If the high water mark gets reached, the CDR Repository Manager deletes processed CDR files until the low water mark is reached or all processed files are deleted, whichever comes first. If all processed CDR files are deleted but the low water mark has not been reached, the deletion stops. The CDRHighWaterMarkExceeded alarm gets generated until the system reaches the maximum disk allocation. If the maximum disk allocation gets reached, the system deletes undelivered files, and files within the preservation duration, starting with the oldest files, until disk utilization falls below the high water mark. If you receive the CDRMaximumDiskSpaceExceeded alarm repeatedly for this scenario, either increase the disk allocation or lower the number of preservation days.
Information on these alarms is found in the CDR Repository Alarm Catalog (CDRRepAlarmCatalog). The following table displays the alarms/alerts in this catalog.
To configure these alarms, go to Cisco Unified Serviceability > Alarm > Configuration > CDR Services.
Table 1 CDR Repository Alarm Catalog
SFTP delivery of CDR files to the outside billing server failed.
The CDR Agent cannot send CDR files from the Cisco Unified CM node to the CDR Repository node within the Cisco Unified Communications Manager cluster.
The high water mark (HWM) for CDR files was reached; some successfully delivered CDR files have been deleted.
The CDR files disk usage exceeded the maximum disk allocation. Some undelivered files may have been deleted to bring disk usage down.
SFTP delivery of CDR files failed on retries.
The CDR Agent cannot send CDR files from the Cisco Unified CM node to the CDR Repository node on retries.
For additional information on these alarms and recommended action, see the alarm definitions at Cisco Unified Serviceability > Alarm > Definitions > CDRRepAlarmCatalog.
For more information on CDR services and alarms, see the Cisco Unified Serviceability Administration Guide.
If you upgrade from Cisco Unified Communications Manager 4.x, Cisco Unified Communications Manager saves the content of the Cisco Unified Communications Manager 4.x CAR database to CSV files. The Cisco Unified Communications Manager 4.x CAR database has part of the CDR information. The Cisco Unified Communications Manager 4.x CDR database stores the complete information about CDRs. This database does not migrate. The Data Migration Tool uses the CAR database CSV files to migrate the CAR database. The system stores the CSV files in the /common/download/windows/car directory. The system stores the pregenerated reports in the /common/download/windows/pregenerated database. Because no corresponding CDR database exists in Cisco Unified Communications Manager 5.x and later releases, the complete CDR data does not migrate to the Cisco Unified Communications Manager 5.x, 6.x, or 7.x system. The Cisco Unified Communications Manager 5.x, 6.x, and 7.x CAR database schema gets extended to contain complete CDR information, but only for the new CDRs that are generated by the Cisco Unified Communications Manager 5.x, 6.x, and 7.x system.
The version of CAR that runs on Cisco Unified Communications Manager 5.x, 6.x, and 7.x does not retain CDRs that are older than the ART database age that gets configured in the Cisco Unified Communications Manager 4.x ART database. The ART database age gets configured in the Configure Automatic Database Purge window of ART. The default ART database age is 180 days. If the ART database age is greater than 180 days, the CAR database in Cisco Unified Communications Manager 5.x, 6.x, and 7.x will retain only 180 days of data. However, if the ART database age is less than 180 days, only data within the specified age limit get retained in the Cisco Unified Communications Manager 5.x, 6.x, or 7.x CAR database after migration. If you migrate records older than 180 days, the system deletes these records immediately after you upgrade.
The Cisco Unified Communications Manager installation program limits the time period for the migration of the CAR records from the CSV files in the Data Migration Assistant (DMA) TAR file to the CAR database on the upgraded system. The migration time period is 60 minutes. To allow the migration of the highest number of CSV files in the allotted time period, CAR record migration uses the following steps:
Data migration begins with the migration of the billing records from the tbl_billing_data CSV file to the tbl_billing_data table of the CAR database. Data migration begins with the youngest record and proceeds toward the oldest record in the CSV file. The billing data migration stops when there are no more billing records to migrate or the migration time period reaches 60 minutes.
If time remains after the billing data gets migrated, data migration proceeds with the migration of error records from the tbl_billing_error CSV file to the tbl_billing_error table of the CAR database. Data migration begins with the youngest record and proceeds toward the oldest record in the CSV file. For each error record that gets migrated, CAR migrates the data that corresponds to the error_record_id that is present in the tbl_error_id_map CSV file into the tbl_error_id_map table of the CAR database. This action ensures that error record data migration stays consistent with data in the tbl_error_id_map. The error record data migration stops when there are no more error records to migrate or the migration period reaches 60 minutes.
If the 60 minute migration time limit occurs at any point in the migration process, CAR data migration ceases and the tbl_system_preferences of the CAR database gets updated to reflect the data present in the upgraded system database.
You cannot upgrade from a Microsoft Windows version of Cisco Unified Communications Manager system to a Cisco Unified Communications Manager Business Edition 5000 system (that runs Linux). However, you can integrate a Windows version of Cisco Unified Communications Manager with a standalone Cisco Unity Connection system. In this particular situation, the CAR installation program will detect this option. CAR does not get supported on a Cisco Unity Connection system and will not get installed. When CAR is not installed, Cisco Unified Communications Manager Administration cannot activate, deactivate, start, stop, or restart CAR Web Service and CAR Scheduler from Cisco Unified Serviceability.