[Freeswitch-users] What is "Recovery On Timer Expire"?

I'm trying to clear up my CDRs from errors, if possible... I see a bunch of Recovery On Timer Expire and they mostly seem to be after 45 seconds of ring time (there is progress). Does that basically mean it rang for 40+ seconds before some timer somewhere kicked in and ended the call? So it's basically a "no answer" or "no user response"? Thanks, -Avi