SCCP phones get the time from the SCCP messaging through a Date/Time Request/Response mechanism. That time is from CUCM which is synced with NTP. SCCP phones do not talk to NTP directly.
For SIP phones, they can use the Phone NTP Reference which allows the phone to directly reach out to an NTP server for their time rather than using the messaging from CUCM. This was made since SIP doesn't have a built-in mechanism to exchange the time/date outside of looking at the Date header in SIP messaging which isn't very accurate compared to a real NTP setup. I would suggest using a Phone NTP Reference for your SIP phones.
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.