When you add a COP file to a CUCM (10.5) cluster I understand you should install the COP file to the publisher first and reboot it. Then install to the 1st subscriber and reboot it. Then do the same for the second subscriber. Does this cause any downtime for the phones and call processing beyond the normal process of phones registering to their next in priority UCM when their UCM is rebooted? My guess would be no. But I don't have a lab to be certain. Thank you. Anything I might be missing?