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Retell AI is a developer platform for building conversational voice agents that sound remarkably human. It focuses on "LLM-based" telephony, handling the complex orchestration of speech-to-text, LLM processing, and text-to-speech with ultra-low latency. Its standout feature is its dashboard for monitoring calls, which provides recordings, transcripts, and sentiment analysis for every interaction. It integrates with Twilio for phone numbers. For businesses building AI receptionists or outbound sales bots, Retell provides the reliability layer. It ensures that the AI doesn't talk over the user, handles pauses naturally, and can be deployed to handle thousands of phone calls simultaneously.