Developer Builds AI Voice Sales Agent That Lets Dealers Order by Phone Call

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A developer has shared the architecture behind an AI voice sales agent designed to let dealers place orders through a natural phone conversation, without needing an app. The system uses Twilio for telephony, OpenAI's Realtime API for conversational intelligence, and LangGraph to manage a structured workflow of tools such as inventory checks and order creation. To minimize conversational lag, the developer opted for real-time voice processing rather than a basic speech-to-text-to-LLM pipeline. PostgreSQL serves as the source of truth for dealer data, product catalogs, and inventory, keeping the LLM focused on reasoning rather than data storage. The project is still in development, and the author documented the architectural decisions to share progress and invite feedback from the developer community.

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