We have just release a plugin that adds functionality to the core Twilio integration for Mautic. This plugin helps keep DNC (do not contact) in sync between Twilio and Mautic, and allows you to specify an automatic reply for incoming SMS messages.
Github: GitHub - EMRL/mautic-twilio-sms-bundle: Adds functionality to the Twilio integration for Mautic.
Packagist: emrl/mautic-twilio-sms-bundle - Packagist