How I Built an Orbital Hotline with Twilio Voice, ConversationRelay, Python, and OpenAI

Rishab Kumar explains the creation of the Orbital Hotline, a voice-first space guide designed to simulate a mission control desk experience using Twilio Voice, Conversation Relay, Python, and OpenAI, among other technologies. Users can call the hotline to inquire about the International Space Station's location, upcoming visibility over their city, local sky reports, and general space-related questions, as well as listen to curated space sounds. The project emphasizes using deterministic routes for known queries and only involving AI for more open-ended questions, ensuring a natural interaction by making responses friendly for spoken audio. The system uses FastAPI, WebSockets, and an array of APIs for accurate space data, while handling user interactions through an intentional design that includes a small Twilio-powered stats dashboard. The hotline also features silence handling and fallback paths for unknown intents, enhancing overall usability. Kumar guides readers on setting up a local environment, configuring Twilio, and deploying the app using Docker, highlighting the importance of maintaining long-lived WebSocket connections and warm instances to avoid cold starts in hosted environments.

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