Call screening dtmf

hey all,
using call screening for some direct DIDs, often teh caller says nothing or coughs and it annoys i mean calls the clients, is there a way to force the caller to after saying their name, they have to push a button, like pound key? if they dont it just times out and hangs up, rather than calling the user and giving them nothing or some junk noises like coughs.

There is

Wnich you could coopt perhaps

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