4) * Retell Inbound Voice Appointments *

Inbound Voice Appointments 

(AI Worker)

with Retell


 RETELL AI


* OVERALL * - Retell is focused on the conversation flow of the voice agent.  Vapi and other voice AI pieces really do not go down to this level.  This conversation flow seems to take part of the AI prompt that the others use.

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8a) Retell ( https://www.retellai.com/ ) for voice AI, n8n (https://n8n.io/), Google Calendar & Airtable

https://youtu.be/lEvClHR8YLs by Demetry on 1 Apr 2025. The nice thing is cancel, reschedule, etc.


8b) Retell ( https://www.retellai.com/ ) for voice AI, n8n (https://n8n.io/), GHL Calendar 

https://youtu.be/JPzzob6BY90 on 31 Mar 2025 by Justin Melendez. This tutorial covers setting up the booking calendar, creating and handling contacts, configuring APIs, and managing various appointment scenarios such as booking, rescheduling, and canceling appointments. 

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COSTS:  (as of 6/4/2025 recheck)

retell.ai is a "pay-as-you-go" with .07 to .08/minute for voice + LLM for 0.003/minute to 0.05/minute + telephony for 0.015 + other misc. costs.  One knowledge base is 0.005/minute. "Expensive" extras are verified phone # $100/month, phone # $2/month, extra knowledge base at $8/month, and concurrency at $8.  Voices are 11Labs, PlayHT, and OpenAI.  LLMs are 7 GPT, 2 Claude, and 2 Gemini versions.  Currently only buys phone # at $2/month through Twilio or Telnyx. Can connect phone # via SIP trunk.

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LEARNING:
  Currently only buys phone numbers through Twilio or Telnyx (as of 6/4/2025 recheck).

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