NTP in CUCM-SUB is unsynchronised with publisher

[networkexpert]

Dear All ,

I have NTP synchronisation issue between CUCM publisher and one of subscriber even after ntp restart still not sync.

please advise how to solve such issue

cucm ver 12.5.1

[Jonathan Schulenberg · Accepted solution]

Does the publisher itself have valid/synchronized time to a real NTPv4 (ie not Windows SNTP) server in either stratum one or two? If not then I would expect the subscriber not to accept that time source.

[networkexpert]

Thanks Jonathan it was NTP issue in publisher as the startum was 6