AI Phone Receptionist n8n Workflow: Twilio + ElevenLabs + Calendar

Turn incoming phone calls into instant, automated appointment scheduling

This AI Phone Receptionist n8n Workflow uses Twilio and ElevenLabs to answer calls, handle FAQs, and schedule appointments in Google Calendar—with n8n running the scheduling logic only when calendar operations are needed.

What this workflow does

• Answers incoming calls via Twilio and forwards the call to ElevenLabs voice AI.
• Handles casual conversation and FAQ responses instantly through ElevenLabs for a smooth caller experience.
• Triggers n8n only when scheduling is required: when the AI needs to check availability or book time, ElevenLabs calls your n8n webhook.
• Checks Google Calendar availability using your business rules and scheduling constraints.
• Uses an Claude-based agent to collect required information and finalize the booking.
• Keeps conversation context across the call using Redis, so the AI doesn’t need to reparse the entire conversation—avoiding severe lag in voice responses.

Use cases

• Clinics and healthcare practices scheduling appointments after asking standard questions.
• Service companies booking jobs based on availability and call details.
• Consultants capturing lead intent and reserving time slots in Google Calendar.
• Any phone-booked business reducing administrative overhead while maintaining a professional reception flow.

Technical details (integrations & nodes)

• Twilio for call handling
• ElevenLabs for voice AI and FAQ/conversational responses
• n8n webhook to route scheduling requests
• Google Calendar tool to check availability and schedule appointments
• Claude agent for request processing and information collection
• Redis memory (essential for low-latency conversation context)

Recommended: Claude 3.5 Sonnet for best scheduling results. Timing: ElevenLabs-only responses typically <1s; n8n tool calls take ~2–4s. Important: all placeholder values must be customized or scheduling will fail.