Please advice, after upgrading to cme 4.1 and cue 2.3.4, the time on the router and on the 7960 phones is correct, but the time on 7970 and 7961 phones is fast, I installed the latest phone loads for all phones I thought.
For a check, let us know what IOS and phonelods are you running.
1. router time set correctly, possibly via NTP, and dailight time, if applicable, set correctly.
2. timezone under tepehony-service, set correctly.
Hope this helps, please rate post if it does!