Retellai

Retellai is an LLM-based, voice-first conversational AI platform for automating phone calls with natural, multi-turn conversations. Build voice agents that can handle complex edge cases, route callers, book appointments, and execute actions in real time using function calling.

The platform supports rapid creation of reliable call flows with a drag-and-drop agentic framework and built-in guardrails. Add built-in or custom preset functions to perform tasks during the call—such as updating records, processing payments, and transferring calls.

Retellai also includes testing and monitoring for production quality. Simulate real-world scenarios before launch, then review post-call analysis with AI quality assurance and performance analytics dashboards to continuously improve outcomes.

You can connect Retellai to your existing telephony via SIP trunking, and integrate with tools across your workflow ecosystem, including HubSpot, Twilio, Vonage, Go High Level, and n8n.

What types of call automation can Retellai handle?

Retellai supports both inbound and outbound calls. Inbound use cases include AI receptionists, AI customer service, call routing/navigation of IVR, and appointment booking. Outbound use cases include lead qualification, reminders/confirmations, surveys, and follow-ups.

Can Retellai transfer a call to a human agent?

Yes—Retellai can transfer calls to a live agent when needed. This lets your voice agent handle routine conversations while escalation happens for complex cases.

How does Retellai connect to my existing phone numbers?

Retellai can integrate with your current telephony system through SIP trunking. This approach is designed to let you use your existing numbers or familiar VOIP providers without replacing your infrastructure.

How do you test AI voice agents before deployment?

Retellai provides built-in simulation testing so you can evaluate agents across real-world scenarios before launch. It also supports post-call monitoring and AI quality assurance to surface failure patterns and improve performance over time.

What can a Retellai voice agent do during a live conversation?

Retellai can run real-time function calling to take actions such as booking appointments, updating records, processing payments, and transferring calls. These actions are connected directly into the call flow via preset or custom functions.

Which tools can Retellai integrate with?

Retellai lists integrations including HubSpot, Twilio, Vonage, Go High Level, n8n, Zapier, Salesforce, and others. You can also connect through an API to build custom communication experiences.