Retell AI (voice agent)

A high-performance conversational AI platform that builds human-like voice agents with sub-800ms latency.

Retell AI delivers a developer-first API for deploying autonomous voice agents that handle complex, real-time interactions. The engine combines proprietary LLM orchestration with low-latency WebSocket streaming to eliminate the awkward pauses typical of AI telephony. Built for scale, it integrates directly with Twilio and Vonage, supporting high-stakes use cases like automated medical scheduling, outbound sales qualification, and 24/7 customer support. Developers get granular control over turn-taking logic, interruption handling, and custom voice synthesis (including ElevenLabs and PlayHT) to ensure every call sounds natural and achieves its objective.

https://www.retellai.com