[Freeswitch-users] Simulating Asterisk dial(x:y:z)

I want to simulate the Asterisk dial(x:y:z) app where (x=total call time, y=warning time, z=warning interval) in Freeswitch. I know it can be done with sched_hangup and sched_broadcast, my question is how can I call a series of "api_on_answer" comands to do it?