We have CUCME 12.0, we have SCCP and SIP Phones deployed. SCCP Phones have correct time whereas SIP Phones have wrong date and time 01/01/1982
NTP Server is Ok, please find below some details:
Router#show telephony-service CONFIG (Version=12.0) ===================== Version 12.0
Router#show ntp status Clock is synchronized, stratum 1, reference is .LOCL. nominal freq is 250.0000 Hz, actual freq is 249.9991 Hz, precision is 2**21 ntp uptime is 7542600 (1/100 of seconds), resolution is 4016 reference time is DD2D9880.93C8EA05 (16:41:36.577 UAE Thu Aug 3 2017) clock offset is 0.0000 msec, root delay is 0.00 msec root dispersion is 0.42 msec, peer dispersion is 0.23 msec loopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000003320 s/s system poll interval is 16, last update was 14 sec ago.
Did you ever get this resolved? We have also struggled with this issue. I was able to get the time syncing to our 9971 (and 9951) phones correctly by downgrading the phone firmware to 126.96.36.199 (from 9-4-2SR3-1) while keeping CME at 12.
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