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I reset the time at 10:30 a.m. this morning; it is now 12:34 p.m. and the clock reads 4:34 p.m.
I do have caller ID and I received a number of calls since the system was reset this morning.
My service provider is Vonage (a VOIP) and the system worked fine for a number of years. I tried the step that you suggested above and the time jumped ahead by 4 hours!