Non existent calls taken when no agents were available seem to be lagging in the queue

If you enable the maxlen, joinempty, leavewhenempty options in a queue, it is well possible that if a call enters a queue with too many waiters, or no available agents, the call is not queued but terminated immediately. Unfortunately such ghost calls seem to be present in QueueMetrics and never being taken by any agent. This is because Asterisk is not logging the piece of information that tells us that the call was rejected from the queue, so QueueMetrics has no way to know the call is not there anymore.

What we do to fix this case is that whenever the queue() command terminates and goes on with the dialplan, we make sure that we output the missing information - and this is in fact pretty easy..

We configure a queue like this:

exten => s,1,Queue(queuename||)
exten => s,2,System( echo "${EPOCH}|${UNIQUEID}|queuename|NONE|EXITWITHTIMEOUT|1" >> /var/log/asterisk/queue_log )

Of course this is a very simplified case, but you should get the idea of how to do it.

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