Personalize Retell Voice Agents with Google Sheets Data

This workflow automates the integration between Retell AI's inbound call webhooks and Google Sheets, allowing voice agents to access personalized user data during calls. Upon receiving a webhook from Retell, it filters requests by whitelisted IP addresses for security, extracts the caller's phone number, and queries a Google Sheet to retrieve corresponding user information. The data is then formatted into Retell's expected dynamic variable structure and returned, seamlessly replacing placeholders in agent prompts with real-time details like names, preferences, or account info.

Benefits include enhanced personalization for voice interactions, reducing manual data management and improving customer engagement without custom coding. It saves developers hours of setup time by providing a ready-to-use n8n template, ensuring reliable data flow for scalable voice AI deployments.

Ideal use cases span customer support (greet by name, reference history), sales outreach (tailor pitches), appointment reminders (include specifics), and IoT device management (link caller to device data). Prerequisites are minimal: a Retell account with an agent and phone number, plus a configured Google Sheet with phone-based user records.