Hi Juan,
Cisco 6900 Series IP Phone support
CCA 3.0 supports configuration of the following Cisco
Model 6900 Series IP phones.
• 6901
• 6911
• 6921
• 6941
• 6961
NOTE Model 6945 is not supported.
Drag-and-drop phone firmware upgrades are also
supported for these phones.
Software Pack and Locale Pack
UC500 Software
Pack Version 8.1.0
Support
CCA 3.0 supports UC500 software pack version 8.1.0.
http://www.cisco.com/en/US/docs/net_mgmt/cisco_configuration_assistant/version3_0/release/notes/cca_30_relnotes_OL23762-01.pdf
Cheers!
Rob