Hai-VoxAI phone agent orchestrates guest calls through Tencent TCCC voice AI, routing to knowledge bases, LLM inference, and hotel backend systems. Guest inquiries flow from SBC/CTI through the voice robot to Hai-VoxAI, which queries HOS property management, HData analytics, Tencent ADP brand knowledge, Bailian DashScope LLM, and Amap services in parallel. The agent escalates complex requests to front-desk staff via CEM work order system while caching responses in Redis and persisting data to MySQL, with Apollo managing configuration. This architecture enables 24/7 multilingual guest support, reduces front-desk workload, and maintains context across property systems. Fork this diagram to customize integrations, add additional backend connectors, or adapt for multi-property hotel chains. The sequence demonstrates how modern hospitality leverages AI voice agents to balance automation with human escalation.