Hi, Thanks very much for your help. We are also planning an upgrade to a later version. I´ve found that this bug is also fixed in it, so I expect to solve this problem. Regards

Hi farshinejad, I have the same sympthom in my installation: from time to time, phones are not reachable but users can still make calls. My installation is older: Secured CUCM 8.6.2 and 78xx/69xx phones. And I found the same message in logs: 09:07:36...