When a CTL or ITL file is present, the IP Phone requests a signed TFTP configuration file from the TFTP server. This allows the phone to verify the configuration file came from a trusted source. With CTL / ITL files present on phones, configuration files must be signed by a trusted TFTP server. The file is plain text on the network while being transmitted, but comes with a special verification signature.
Since your ATA is not requesting a signed configuration file, then you shouldnt have any problems...
NB A signed configuration file will look like this: ATA18758A2A5E01.cnf.xml.sgn
Does your ATA not register? and has the ATA previuosly register with CUCM server in the past?
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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.