How to Build an AI Voice Agent That Answers Calls & Books Appointments

Published at : 23 Dec 2025

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Ready to take your AI agent to the next level? In this video, you learn how to turn the text-based agent we built previously into a fully conversational Voice AI capable of answering real phone calls. Using the power of Ultravox (a state-of-the-art speech-to-speech model) and Twilio, we'll create a knowledgeable and responsive agent that is able to help your customers make important buying decisions.

Watch as we put the agent to the test in a live demo: hearing it answer complex product questions, recommend specific studio models based on square footage, and seamlessly book an appointment in real-time. If you want to automate customer support across phone lines with an agent that offers better latency and realism than standard tools, this is the workflow you need.

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