My Dialplan calls an IVR once the IVR picks up it dials the extension.  At this point it gets transferred to a Lua script and after the answer() the Lua script waits for silence.  

session:execute("wait_for_silence", "300 25 10 50000")

The problem is that after about 1-2 seconds it detects audio automatically without anyone picking up the phone.  I am looking at the cli and the script is paused waiting without anything else executing, then all of a sudden.

"2019-05-27 17:05:17.298768 [ERR] switch_ivr_play_say.c:2108 switch_ivr_wait_for_silence: SILENCE DETECTED".