/mcp• QoS Notification indicates when the percentage of good calls drops below a specified range or the percentage of poor calls exceeds a specified limit. You can set the range in the Report Config > Notification Limits window. Enabling the system for email alerts comprises a two-step process. First, you must specify the mail server configuration information (System > System Parameters > Mail Parameters). CAR uses the configuration information to successfully connect to the email server. Next, you must enable the email alerts on the Automatic Report Generation/Alert window (Report Config > Automatic Generation/Alert). By default, CAR enables email alerts for some, but not all, reports. Be sure to disable the automatic email alerts to conserve system resources while you upgrade your system to a later version of Unified Communications Manager. The system does not provide email alerts to application users because no mail ID exists for an application user. Note Purging CAR Data This section contains information on the following topics: • Automatic purging • Manual purging • Event log purging CAR provides automatic and manual purging of the CAR database. By default, the system enables automatic purging. Before and after loading CDRs/CMRs, CAR checks the size of the CAR database and invokes automatic purging, if necessary, to control the CAR database size. With automatic purging, CAR continuously monitors the number of days that the CDRs are kept in the CAR database; when the CDR age exceeds the maximum number of days as configured in the maximum age setting in the Configure Automatic Database Purge window, CAR deletes all CDRs that are older than the number of days that you configured. In the Configure Automatic Database Purge window, you specify the percentages of the CAR database that you want to allot for CAR data; the system maintains the CAR database size between the high water mark and low water mark that you specify. When the CAR database size exceeds the low water mark, CAR sends an email to CAR administrators. When the CAR database size exceeds the high water mark, CAR begins to delete the partitions from billing data and billing error tables, starting from the oldest date partitions until under the specified limit, allowing the system to continue loading the latest records. In cases where there are many CDRs present in the CAR database and deleting the partitions does not lower the limit, CAR keeps at least two days worth of data and send an email to CAR administrators. Table 2: Maximum Size of CDR Database Maximum Aggreg Busy Hour Call At (BHCA) Maximum Size of Database Maximum Number of CDR Records Version 10,000 6 GB 2 million records Unified Communications Manager Call Reporting and Billing Administration Guide for Cisco Unified Communications Manager, Release 15 and SUs 7 CDR Analysis and Reporting CDR Analysis and Reporting Overview