I have hit an issue since I upgraded the device packages on my CUCM cluster.
We are running CUCM 6.1 and I upgraded device packs for all of our phone models - 7906,7911,7931 and 7971.
Since the upgrade the 7931's have been intermittantly problematic, if powered off some go throught he upgrade process and seem to complete then constantly keep cycling through the same process.
They never seem to register again. At first I thought they were potentially faulty but I have since been able to register them against a CME in my lab and they function correctly.
Does anybody have an idea on resolving this or deleting the device pack from CUCM. The former device pack is still there and they all worked fine on this.