[Freeswitch-users] esl originate + sessions-per-second

Hi, Is there a way do detect that an "originate" call over ESL has failed because of the "sessions-per-second" setting? I see "Throttle Error!" in the Freeswitch logfile and "503 Maximum Calls In Progress" on the SIP level, but the originate call itself just returns "-ERR DESTINATION_OUT_OF_ORDER" with no indication that the "sessions-per-second" limit was the reason for it. Thanks, René