Onvif Vs Proprietary, Time Synch Issues

Could this be an issue with ONVIF, or am I doing something wrong?

I noticed that my ONVIF cameras are 1-3 seconds out of synch (late) from the cameras that are proprietary to the NVR.

I have a Hikvision DS-7716 NVR running IVMS-4200, using time.nist.gov

My cameras are:

3 Speco (set for ONVIF on the NVR, and they are in synch with the other Speco cameras.)

3 Hikvision (all in synch with the other Hikvision cameras.)

I looked at the setup of the ONVIF Speco cameras and noticed the NTP is an option in a drop down menu and is time-a.nist.gov.

So, I have time.nist.gov set in the NVR, but in Speco's setup it is nist-a.gov.

I've read the Time Synch Tutorial but, have not yet resolved this problem. Am I making too much of a fuss over this issue?

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