How to send the json of the package after the call?

Question

Asterisk

Tell me how to send json to the server of all incoming calls.

I'm trying to do this in the file extensions_override_freepbx.conf I write

[sub-add-call]
exten => s,1,Set(MyRes=${SHELL(/usr/bin/curl -X POST -s -m 1 -H 'Content-Type: application/json\; charset=utf-8' --data '{"phoneNumber":"${CALLERID(num)}","startTime":"${CDR(start)}","endTime":"${CDR(end)}"}' http://localhost/)})
same => n,noop(${MyRes})
same => n,Return

But unfortunately it doesn't work and I don't understand why. Tell me where to look, maybe I didn’t finish it