In this tutorial, learn how to transcribe phone calls in real-time using C# .NET with AssemblyAI and Twilio. The application involves creating a WebSocket server for Twilio media streams and transcribing the media stream using AssemblyAI's real-time transcription service. This can be further extended by passing the final transcript to a large language model (LLM) to generate responses or executing specific actions based on the caller's preferences.