[Freeswitch-users] possible to use mod_fifo without parking a caller?

I’d like to use something like mod_fifo, if possible to support my use case: - caller calls in - freeswitch sends 183 (pre_answer) but does _not_ answer the call - via out of bands means, I send information to an “agent” that a caller is waiting (providing uuid, or parking slot) - agent calls in (to the “parking slot” or equivalent) - caller is now bridged with agent - OR, if no agent calls in within X seconds, caller is rejected with a SIP 480 Is something like that possible with mod_fifo, or other module? Dave