Conversational AI is transforming user interactions with artificial intelligence by enabling natural, real-time voice conversations with AI agents, providing more intuitive and efficient interactions. Developers who have built custom large language model (LLM) workflows for text-based agents can now connect these workflows to an Agora channel using Agora's Conversational AI Engine, allowing for real-time voice conversations without needing to overhaul existing AI infrastructures. The guide details the process of creating a Fastify backend server to manage voice-based AI interactions, including setting up the environment, creating necessary directories and files, implementing agent routes, and integrating token generation for seamless operation with Agora's Conversational AI Engine. The server uses TypeScript and Fastify, incorporates environment validation and request validation middleware, and is designed to support dynamic token generation and conversational agent management, providing a robust base for integrating voice AI capabilities into applications.