I have added 2 NTP Server IP addresses as shown in Capture_NTP1, but how do I apply one of these references to the phones?.
By default SCCP phones with take their time from the the CUCM server.
SIP phones can use PHONE NTP Refernces
You can change the PUB server to take its time from NTP server(s) too
Please read this link from the OS admin guide
Please rate useful posts
In reading the guide it gives the followig note:
What is a node in the Cisco world all devices? i.e all phones?
You make the the change use NTP on the publisher CUCM server.
If you have SUB servers in your cluster you need to restart them.
Obviously you need to carry this out at a time convenient to your users
Perhaps the evening or over a weekend
It is very important that servers in the cluster are synchronised.
Not sure if its worth mentioning or not but I have never restarted my subscribers when making a change to NTP on the Publisher node. I just ssh into the subscribers and issue the command Utils NTP restart and they sync up nicely. Unless thats what the documentation was referring to.