asterisk users - Feb 2018 - TALK_DETECT - having trouble figuring it out.

Is there a bit more of a detailed explanation of TALK_DETECT anywhere?

I googled and found nothing really beyond the wiki at
https://wiki.asterisk.org/wiki/display/AST/Asterisk+15+Function_TALK_DETECT

I really only want it to listen for one side (the caller) but it seems to
listen to both. OK, I can work round that, but the other thing is, it seems
to be ignoring my threshold values

using Set(TALK_DETECT(set)=silence_ms,noise_ms)

like

Set(TALK_DETECT(set)=120,1200)

then even though it shouldn't even respond to "hello" (under a
second), it
even detects with a click of the fingers, which is definitely not 1200ms.

I really only want it to respond to "Asterisk?" but ... struggling a
bit.

In case there's a better way, what I'm trying to do is CONTROLPLAYBACK a
file, but also listen for someone saying what you might call a wake word,
but not via MRCP or anything like that.
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