# Part 11: AI Voice Agents

> AI voice agents that talk with your customers. Part 11 of 12 in the free Stepthrough AI course: 3 modules, Modules 52–54 of the course. Take them in…

Source: https://learn.ynteractive.com/content/course/part-11-ai-voice-agents · Updated 2026-10-10 · Free from Stepthrough (https://learn.ynteractive.com)

Updated October 10, 2026

AI voice agents that talk with your customers. Part 11 of 12 in the free Stepthrough AI course: 3 modules, Modules 52–54 of the course.

Take them in order: each module builds on the one before it, using ElevenLabs Agents and ChatGPT. Every module is a real project you build in a practice copy of the tool, right in your browser, with a voice-over explaining each step. It is free, and no experience is needed.

## The modules, in order

1. [**Module 52: Your First Voice Agent in ElevenLabs: An After-Hours Receptionist**](https://learn.ynteractive.com/content/elevenlabs-voice-agent-tutorial-after-hours-receptionist)
   Build an after-hours phone receptionist for a small plumbing company: system prompt, a greeting that says it is AI, a calm voice and a fast model, then test-call it in your browser and read the transcript.
   Free · ElevenLabs Agents · about 9 minutes
2. [**Module 53: Give Your Voice Agent Knowledge: A Price List and FAQ in ElevenLabs**](https://learn.ynteractive.com/content/elevenlabs-agent-knowledge-base-price-list-faq)
   Upload a plumbing company's price list and FAQ to your ElevenLabs agent's knowledge base, tell it to answer only from them, and test it with three tricky questions, including a price it must not guess.
   Free · ElevenLabs Agents · about 9 minutes
3. [**Module 54: ElevenLabs vs Vapi: Cost per Call and a Launch Checklist**](https://learn.ynteractive.com/content/elevenlabs-vs-vapi-cost-per-call-launch-checklist)
   Decide between the ElevenLabs and Vapi versions of Cedar Creek Plumbing's AI receptionist: give ChatGPT the real prices, catch its math slip, compare volumes and setup effort, then build a launch checklist and an…
   Free · ChatGPT · about 8 minutes

- Previous part: [Part 10 · Build Apps with Lovable](https://learn.ynteractive.com/content/course/part-10-build-apps-with-lovable)
- All parts: [The full course](https://learn.ynteractive.com/content/course)

[See the full course, every part in order](https://learn.ynteractive.com/content/course) · [All free tutorials](https://learn.ynteractive.com/content)

## How every module works

Each step is shown on the left, with a cursor pointing to exactly where to click. You do the same thing on the right, in a practice copy of the real tool. Get it right and it moves on. Nothing touches your real accounts until you're ready to build it for real.

[Start learning free](https://learn.ynteractive.com/)