i have configure the core switch as NTP server for my ip phones. It take the time just fine but i notice that the time in the core switch is not accurate so now i need to change the time in the core (NTP server) so once i change the time in the Core should i reset all the ip phones in the CUCM to get the correct time or it will get the time without any reset?
No need to reset any phones, once the time is corrected and CUCM adjusts it's time based on it so will the phones. It may take a while though depending on how off the time was, so be patient.
