Cisco Unified CM Service Parameter Configuration

C.

The correct answer is B. Set CDR Log Calls with Zero Duration Flag to True.

Explanation: Call Detail Records (CDRs) are used to track call activity on Cisco Unified Communications Manager (CUCM). CDRs contain information about call details such as call duration, caller ID, dialed number, etc. In this scenario, the company policy mandates logging of all calls that last less than one second in CDRs.

To comply with this policy, the CUCM Service Parameter "CDR Log Calls with Zero Duration Flag" needs to be set to True. This parameter enables CDRs to be generated for calls that last less than one second. When this parameter is set to False, CDRs are not generated for calls that last less than one second.

Option A, setting CDR Enabled Flag to True, enables CDRs to be generated on the CUCM system. However, it does not specifically address the company policy of logging all calls that last less than one second.

Option C, setting both CDR Enabled Flag and CDR Log Calls with Zero Duration Flag to True, would also comply with the company policy. However, it is not the minimum configuration required to achieve compliance.

Option D, setting CDR Enabled Flag to True and Call Diagnostics Enabled to Enable Only When CDR Enabled Flag is True, is not relevant to the scenario. Call Diagnostics is a separate feature that allows CUCM to collect additional information about calls for troubleshooting purposes.

Option E, leaving CDR Enabled Flag and Call Diagnostics Enabled to their default settings, would not comply with the company policy as the CDR Log Calls with Zero Duration Flag is not set to True.

Therefore, the correct option is B, setting CDR Log Calls with Zero Duration Flag to True.