Hi,

It's happenning for some of the 7940 IP Phones and one 7970 IP Phone.

Regards,

Have you tried to reset the phones to check if that changes anything ?

Yes, i tried resetting one IP Phone . But still IP Phone shows incorrect timing..

Can you check and see if the phones are not running an old firmware. If yes, you should upgrade them to a newer version.

Also, the phones try to sync the time with the CallManager at 2 AM everyday. And ensure that Timezone configured for these phones are correct and match the settings of the phones which display the right time

All the IP Phones are having Date Time Group Configured as a Indian Standard Timing.

Is it we need to do any individual configuration for time setting on IP Phones?

Regards,

No, that should be it. How many mins/hours is the phone off the correct time ?

The max time difference we found of about 30mins from correct time. Remaining are 10mins,17mins,5mins.. etc.

The oddity is that the times differ on different phones. Our time was off by a couple of minutes on all phones so we ensure all of our call managers were pointed to our NTP server and under the service made sure it was set to automatic so if the servers reboot the service starts. CM 4.1(3) 7940 and 60's