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CC is not my core competency, but after some investigation trying to find a list of parameters available to create reports and the customer not being happy with our documentation on CCO...http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/con...
I had the same challenge, it kept saying registering SIP, but didn't get anywhere. I changed the security settings > Call server mode to Auto detect and there we go, registration works and upgrade starts.
