htluo Wed, 04/21/2010 - 05:56
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Depending on your Windows version, there are some registry settings you need to set:

Changing the ‘Enabled’ flag to the value 1 enables the NTP Server.

Change the server type to NTP by specifying ‘NTP’ in the ‘Type’ registry entry.

Set the ‘Announce Flags’ registry entry to 5, to indicate a reliable time source.


Set 'LocalClockDispersion' to 0

The last one is most important one.

After changing registry, you need to restart "Windows Time" service.

Then you may go to CUCM > OS Administration > Settings > NTP Server to configure the time source(windows DC) address.


Richard Simmons Tue, 04/29/2014 - 01:28
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Hi Michael,

I know this is an old post but I've just used this on Windows 7 and its worked perfectly, many thanks!



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