Setup NTP on in the Cisco Call Manager (CUCM), so the CUCM and phones always have the correct time!
The phones are connected / linked to a device pool in de Callmanager CUCM > System > Date/Time group [ CMlocal ] The time/date format on the phone is set in this field CUCM > System > Device Pool (one time setup)
Setup the time of the CUCM (+ phones) CUCM -> "Navigation" => Cisco Unified OS Administration Settings > fill in "Time" + "NTP Servers"
Time This is the local time CUCM + phone will use BUT use NTP instead! NTP Server : fill in one, or better 2 ip addresses of local NTP servers Try your internal Microsoft domain controllers or internet NTP servers. for example the ntp server of you provider and an extra backup (but it is possile you have to change firewall settings)
Note, what I found in the documentation CUCM only works with a Stratum > 10 and NTP Version 4
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.