Silence while screening calls

How can I play a file while the person that calls is waiting for the called to make a selection ?

So the person dials extension 110 which chose to Screen calls. It rings, then the person at 110 picks up. At that moment the ringing stops and the caller is presented with silence until the called makes a decision.

How do I fill up that dead time ?

I have never reall messed with the privacy command but try using the m command in ur dial string.