How to control and record voice calls with Node.js serverless functions

The author of this article, Stefan Judis, is exploring the possibility of generating an RSS feed from Twilio voice calls. He introduces the concept of "PodBot" - a phone call-driven podcast site where users can make phone calls to generate podcast episodes without needing a microphone setup or audio file storage. To achieve this, the author uses Twilio serverless functions to accept and manage phone calls, recordings, and voice transcriptions. The article provides a step-by-step guide on how to set up these functions using Node.js and Twilio's API, including creating three JavaScript files for call-enter, transcribe-title, and call-exit endpoints. With this setup, users can log information from the phone calls, such as CallSid, RecordingUrl, and TranscriptionText, which can be stored in a database or other stores. The article concludes by explaining how to run these functions locally using twilio-run and connect them with Twilio numbers for incoming calls.