I know that CDR records in CM have timestamps based on "computer time" which is the elapsed seconds since Midnight on the 1st January 1970 (don't ask me why, I was only 6 years old at the time!).
That doesn't seem to work with your numbers unless your system time is set for the mid '70s (188706854 / 60 / 60 / 24 / 365 = just under 6 years).
The difference between Connect and Disconnect time is quite large (8129), so it's unlikely to be seconds (that would be over 2 hours).
Try making some calls with timed duration and at timed intervals and check the results.
Sorry I can't give a definite answer.