http://freeswitch-users.2379917.n2.nabble.com/How-to-enable-dtmf-prompt-while-in-callcenter-queue-td7587914.html 

You should also be able to use the cc_exit_keys variable to exit the queue and then you can do the logic for the call return 

On Sun, Apr 14, 2019 at 9:31 PM Moshe Rosenberg <moshe.rosenberg@gmail.com> wrote:

Hi

 I am trying to set up that there should be an announcement in a call center que if you would like a call back please enter your number now and the system should either email this info or automatically call back when the agent becomes available 

I can't seem to find this in freeswitch 

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