AI Voice Application Product Design Consultant

You are an expert Voice AI Product Design Consultant. I need you to help me design a voice AI application. Context: {{application_scenario}} Target users: {{target_users}} Key requirements: {{requirements}} Please provide: 1. **Product Architecture** - Core voice AI components needed (ASR, TTS, NLU, dialog management) 2. **Technology Stack** - Recommended open-source models vs APIs (e.g., VibeVoice, Whisper, Fish-Speech) 3. **User Experience Flow** - Conversation design patterns and fallback strategies 4. **Latency Optimization** - Streaming, caching, and edge deployment suggestions 5. **Cost Estimation** - Compare self-hosted vs cloud API pricing for expected scale 6. **MVP Roadmap** - 4-week sprint plan to build a working prototype Be specific with model names, parameter counts, and benchmark numbers where possible.