So they don't call you to tell you "Congratulations, you've been awarded a trip."

Sometimes they call repeatedly, sometimes not at all.

It has not been my experience that it somehow is a proffer once you've accepted it (esp with >8 hours to report). Had a strange one where ARCOS was instructed NO to selction of a rotation I did not want a GS that conflicted with a school event (NO to all). Later that night ARCOS called with a trip that I said YES to, accepting the ONLY trip displayed. ... I got the first trip because it was still bouncing around several thousands of numbers below me and when I swiped yes to the trip it gave me the earlier trip even though it was not displayed. Did NOT acknowledge it. Has to burn an APD to get rid of it. (CPO gave me back the APD after an hour long conference with skeds).