In the context of video games, integrating voice AI with non-player characters (NPCs) enhances the player's experience by enabling more natural interactions, eliminating the need for pre-recorded responses or complex dialogue trees. Agora's ConvoAI Engine facilitates this integration by handling real-time audio processing, speech recognition, and large language model (LLM) orchestration, ensuring low-latency communication. This guide outlines the steps to implement conversational AI for NPCs in Unity, leveraging Agora's infrastructure to create NPCs that can engage in dynamic conversations and respond contextually based on game state and player interactions. It emphasizes the importance of configuring NPC personalities, managing conversation states, and optimizing for performance while maintaining quality and reliability. The guide also addresses the challenges of testing and optimizing spatial audio for immersive gameplay experiences, ensuring that NPC interactions remain seamless and engaging.