Resolved! C20 and CUCM 8.5
I have found documentation about how to register my C20 into CUCM 8.6 but nothing about CUCM 8.5.http://www.cisco.com/en/US/docs/telepresence/endpoint/codec-c-series/tc5/administration_guide/administering_endpoints_running_tc5_on_cucm8-6.pdfI am wond...