Retell AI

Retell AI is a voice-first conversational AI platform built on large language models, designed to automate phone-based interactions at human-like quality. The platform covers inbound and outbound call scenarios including customer service, appointment setting, lead qualification, debt collection, and surveys. Independent benchmarks place Retell at approximately 600ms latency, which the company attributes to a proprietary turn-taking model that manages conversation flow naturally. Agents are configured through a drag-and-drop agentic framework with built-in guardrails, and a streaming RAG system keeps the knowledge base current by automatically syncing with a business's latest website content.

For BPOs and contact centers, Retell provides the infrastructure to run AI agents across the full call lifecycle. Agents can execute real-time function calls to book appointments, process payments, update records, and route calls, reducing the need for live agents on routine interactions. The platform includes built-in simulation testing to validate agent behavior before deployment and continuous QA tools that surface failure patterns from recorded calls. Performance analytics dashboards let operations teams track call outcomes and agent metrics. Telephony features include SIP trunking for existing VOIP integrations, batch outbound calling campaigns, and verified phone numbers. Compliance coverage includes HIPAA, SOC2 Type II, and GDPR, a setup that fits contact centers operating in healthcare and other regulated sectors.