Also, Twilio’s current documentation states to use Asterisk 15 and PJSIP trunks.
This page: https://www.twilio.com/docs/sip-trunking/sample-configuration
Has this link for FreePBX: https://www.twilio.com/docs/documents/53/TwilioElasticSIPTrunking-FreePBX-Configuration-Guide-Version1-0-FINAL-06122018.pdf
Yeah when you google, the first hit is some post from 2016…
But the PDF linked above is dated June 12, or December 6, of 2018. depending on how they formatted the date…