You need to order either CUWL or UCL licenses from Cisco reseller and you will receive PAKs that need to be registered and applied to the system. With version 8.6 you will get DLUs on the back end side, which is slightly confusing.
The licensing is not per phone but rahter per user, so you will need to decide how many users will be assigned to these phones to figure out exact license count, for example if a single user has more than 2 but less than 10 devices you will need CUWL Standard license for that user, if only one device then you will need UCL enhanced, if 2 devices then UCL Enhanced Plus, etc.
This is correct, Cisco has changed licensing approach few times, however until version 9 the enforcement did not keep up. So, even though DLUs have not been sold for quite some time, on the back end side they are used in version 8.6. When you buy CUWL or UCL licenses which are user based licenses, Cisco makes assumptions as to how many DLUs each license type equals and you get as such, for example I belive CUWL Standard assumes 11 or so DLUs. This is all finally addressed nicely in version 9 via ELM. Since you cannot buy DLUs you have to buy user licenses which will convert to DLUs accordingly.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.