Retell AI

Retell AI is a third-generation AI voice agent platform that enables businesses to build, deploy, and manage humanlike AI phone agents for automating inbound and outbound calls. Powered by large language models (LLMs) and proprietary voice AI orchestration, Retell delivers natural, multi-turn conversations with approximately 600ms latency—industry-leading responsiveness that keeps interactions smooth and fluid. The platform supports use cases including customer support, lead qualification, appointment booking, receptionist services, dispatch, debt collection, and more, serving industries such as healthcare, financial services, insurance, logistics, home services, retail, and travel.

Retell AI provides a highly configurable agentic framework with a drag-and-drop call flow builder, real-time function calling, streaming RAG (Retrieval-Augmented Generation) for up-to-date knowledge base answers, and built-in simulation testing for pre-launch validation. It integrates with major telephony providers (Twilio, Vonage, Avaya, Genesys, Five9) via SIP trunking, and connects to CRM and automation tools like HubSpot, Salesforce, Go High Level, Zapier, and n8n. The platform also supports voice, chat, SMS, and API channels for true omni-channel communication.

Enterprise-grade security and compliance are built-in, with HIPAA, SOC 2 Type II, and GDPR certifications, plus features like SSO, custom role-based access control, personal info redaction, and on-premises deployment options. Retell AI is designed to scale to millions of calls and is suited for both fast-growing startups and large enterprise support and sales teams looking to reduce costs and improve customer experience through voice AI automation.