Twilio's ConversationRelay service allows developers to integrate Speech-to-Text (STT), Text-to-Speech (TTS), and AI Large Language Models (LLMs) with their Twilio Voice Applications. Recently, ElevenLabs has been added as a TTS provider, offering over 1000 voices to choose from. This tutorial guides users through integrating and customizing ElevenLabs voices with ConversationRelay in Node.js. By following the steps outlined in the tutorial, developers can create AI chatbots or personalized assistants that respond to customer queries through natural voice interactions, without having to connect with an agent. The tutorial covers setting up a ConversationRelay service, importing environment variables, integrating ElevenLabs voices, customizing voice settings, and connecting the application to Twilio. Once completed, users can run and test their application, refining the voice settings as needed. By integrating ElevenLabs with ConversationRelay, developers can create rich, human-like voices that bring their voice applications to life.