Well, CUCM IP Phones does not take time from NTP, the "NTP Reference" is only for SIP Phones. As well as the SIP Phones on CME can also get time from NTP - "ntp-server" command in voice register global.
I have made a very simple test, to prove that the UCM Platform TimeZone, and even the Routers Timezone does not have any impact on IP Phones time: Well I have changed the UCM Platform Timezone, but the IP Phones still showed up the older time. So the Platform Timezone does not have any effect on IP Phones time. The same was done on the Router - changed the IOS Timezone, and the IP Phones were still showing up the older time. So the IOS Timezone does not effect the IP phones Time. On Tue, Jan 3, 2012 at 7:14 PM, Ken Wyan <kew...@gmail.com> wrote: > For CUCM Phones , timezone of the date/time group applies. We can define > an NTP server for a specific date-time group (independant of CUCM time) > For CME Phones time-zone configured under telephony-service applies. But > CME phones have to take time from Router only. (Router can sync to an > external NTP Server) > > I haven't decoded NTP messages to know whether it contain time in UTC or > does it contains NTP server's time & it's time offset from UTC. > > On Tue, Jan 3, 2012 at 2:51 PM, datucha123 datucha123 < > datucha...@gmail.com> wrote: > >> Please correct me if I am wrong: >> >> When the CUCM is synchornized with NTP, it synchronizes its UTC time with >> NTP, and then we can set the Timezone for the Platform, which will effect >> only OS (setting the Timezone in OS does not effect the Time on IP Phones). >> >> But when we are configuring the Date/Time Group, and setting the >> Timezone, it is based on the NTP synchornized UTC Time of the OS (Not the >> Time that is received by the Timezone in OS). >> >> The same goes for the Routers - they synchronize time through NTP, and >> they basically synchronize their UCT Time, and setting the Timezone on the >> Router will not effect the Telephony-service time. When configuring the >> TimeZone in Telephony-Service for IP Phones, the TimeZone is based on the >> Routers UTC time and not based on the Routers TimeZone corrected time. >> >> >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> Are you a CCNP or CCIE and looking for a job? Check out >> www.PlatinumPlacement.com <http://www.platinumplacement.com/> >> > >
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