Hi Sinan,

When you install your system, the system enables CDRs by default. Call management records (CMRs) remain disabled by default. You can enable or disable CDRs or CMRs at any time that the system is in operation. You do not need to restart Cisco Unified Communications Manager for the change to take effect. The system responds to all changes within a few seconds. The system enables CMR or diagnostic data separately from CDR data.

Configuring CMRs

You can configure CMRs on the Service Parameters Configuration window in Cisco Unified Communications Manager Administration. To access the Service Parameters Configuration window, open Cisco Unified Communications Manager Administration and choose System -> Service Parameters. Choose the Advanced button to display the complete list of Service Parameters. Select the Call Diagnostics Enabled parameter.

This parameter determines whether the system generates CMRs, also called call diagnostic records. Valid values specify Disabled (do not generate CMRs), Enabled Only When CDR Enabled Flag is True (generate CMRs only when the CDR Enabled Flag service parameter is set to True), or Enabled Regardless of CDR Enabled Flag (generates CMRs without regard to the setting in the CDR Enabled Flag service parameter). This represents a required field. The default value specifies Disabled.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/7_0_1/cdr-defs/cdrcmru.html#wpxref36593

Hope this helps!

Rob