Imagine I have Cisco SCCP IP Phone is associated with a some single DN in CUCM 6.x.
Please, advice, the way of how-to:
1. DeAssociate DN from this IP Phone thus moving it to Unassigned DNs category (we mustn't delete DN)
2. IP Phone configuration should remain in CUCM. I mean IP Phone has to remain without any DN (we mustn't delete Phone).