When A CSV file is created for use with the Cisco Unified Communications Manager Auto- Register Phone Tool, how is the IP phone MAC address configured?
A. A dummy MAC address is entered for each phone in the CSV file.
B. The MAC address is left blank in the CSV file and Cisco Unified Communications Manager BAT imports the CSV file with the Create Dummy MAC Address option selected.
C. When the CSV file is created, the Create Dummy MAC Address option must be selected before the file is uploaded into the Cisco Unified Communications Manager BAT tool.
D. The MAC address is left blank in the CSV file and Cisco Unified Communications Manager BAT queries the Cisco Unified Communications Manager device database for the MAC address that matches the extension created in the CSV file.
I believe correct answer should be C.
“By using the dummy MAC address option in the CSV data file, you do not need to add the individual MAC addresses for the new phones.”
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/bat/11_0_1/CUCM_BK_B9E9D7C7_00_bulk-administration-guide-1101/tool_for_auto_registered_phones_support__taps_.pdf