How to catch the events of accepting an operator's call from the queue?

Question

Asterisk

The bottom line is this - I plan to implement a cluster of asterisks.
In order for the operator (who will be registered on several asterisk servers at once) not to receive calls in parallel from several servers, it is necessary to be able to catch the event “call answered in queue”, “end of call answered in queue”.

Answer 1

if it's not a secret, why do you need a cluster, the minuses are clear, what are the pluses?

Answer 2

fault tolerance.
we have a call center that can receive up to 1000 calls in total. keeping it on one asterisk is an unsafe thing, because even with large resources, an asterisk tends to enter a deadlock.