How to Easily Connect a Twilio Phone Number to Retell AI

In this video, I break down how to connect AI voice agents with phone numbers using Retell AI and Twilio. As no-code solutions make AI-powered calls more accessible, the key challenge is setting up the right connection for seamless inbound and outbound calls. I simplify this process so you can get your AI voice agent up and running effortlessly. If you tried setting it up yourself, but are facing issues, this video is for you. I’ve covered some Twilio free account restrictions and how to work around them to get your voice agent working without limitations.

You’ll learn:
- How to create a Twilio account and receive free trial credits
- How to purchase a voice-enabled Twilio number using free credits
- How to set up SIP trunking to link Twilio with Retell AI
- How to configure authentication credentials, IP access controls, and PSTN transfers
- How to bypass trial account restrictions for smooth call handling

Let’s make AI-powered calling effortless!

📞Retell AI Voice Agent Series:
- Learn how to build basic Single Prompt Agents (Must Watch for Beginners): https://youtu.be/c4R6AgUwYFs?si=gciLRK5yJLj4udyO
- Learn how to build Advanced Multi Prompt Agents with Functions (For anyone looking to level up): https://youtu.be/wVnp1tw6u38?si=C_KpDbm4MegpY2qD
- Learn how to build AI Outbound Caller (easily call with AI): https://youtu.be/vijewnnQSwM?si=noVuk0scn4BkF_5y

🎯Looking for AI and Automation Services like these? Work with me: https://automatezai.com/
📞 Looking for my guidance? Book a 1:1 call with me: https://cal.com/yashica-jain/consulting

🛠TOOLS USED: (some of these are my affiliate links. If you use it, it will get you a free trial, and buy me an extra cup of coffee for the day☕️).
1. Retell AI: https://dashboard.retellai.com//?ref=yashica
2. Twilio: https://www.twilio.com/en-us

💁🏼‍♀️Connect with me: https://www.linkedin.com/in/yashicajain9/

Hope this video helped you in some manner, if so let me know in the comments below!👇🏻

#retellai #aivoiceagents #aicaller

0:00 Intro
1:39 Twilio Account Setup
3:17 SIP Trunk Setup
5:56 Authentication
7:27 Final Connection
10:33 Hacks & Testing