[Freeswitch-users] Question about FIFO event

Hi, I am trying to write an event listener that can record the time when a FIFO consumer rejoins the queue after the caller hangs up. Tracing through all the event traffic, I notice that there is FIFO-Action= consumer_start, consumer_stop, and consumer_pop, but there isn't one that indicates that the consumer rejoins the queue after the caller hangs up. Is there anyway I can detect this particular event? Thanks for your help. Woody