Platform: CUCMBE 6.1
If I want to sync all the phones to a NTP source, is there more to it than pointing to a server in the "Phone NTP Reference" and then add the NTP reference in "Date/Time Group"? I've reset:ed the phones.
I normally configure when prompted during the installation. You should be able to add them using the web interface though.
Try Cisco Unified OS Administration page then Settings > NTP Servers.