SAY_DTMF_INTERRUPT not working

Hi,

I am trying to use SAY_DTMF_INTERRUPT with Asterisk 20.0.1. I see that I
asked about it here https://www.spinics.net/lists/asterisk/msg174142.html
and Sean was nice enough to create a patch. I am trying it on 20.0.1 by
doing in the dial plan:
CHANNEL(SAY_DTMF_INTERRUPT)=on
and I get back:
Unknown or unavailable item requested: 'SAY_DTMF_INTERRUPT'
When I do: "core show function channel" I don't see it as an option. What
am I doing wrong?

TIA.

Dovid

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