USing a queue with analog phones, how to get it to skip someone who is on the phone

I am trying to set up a queue that will ring analog phones This is by dialing a number not by using a FXS card.
I set up the extensions as custom extensions. And that works. The problem is that the queue does not know the phone is in use when someone in on the phone and will send another call right away. Is there a way for it to know that the person is on the phone still? Setting it to skip busy agents doesnt help

Thank you

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