Clarification on Browser-Based Inbound Voice Agent (No Phone Number)

Support Help
1

Hi Retell AI Support Team,

I’m currently deploying an inbound voice agent and want to clarify whether it’s possible to run the agent entirely in the browser (WebRTC) without purchasing a phone number.

My goal is:

  • Inbound voice only

  • User clicks a button on my website

  • Browser microphone opens

  • Voice conversation happens fully in-browser

  • No phone call, no callback, no telephony number

Could you please confirm:

  1. Whether this setup is fully supported today using your Web Call / WebRTC flow

  2. The exact steps required to implement this (frontend + backend, token creation, SDK usage, etc.)

  3. Any limitations or requirements (HTTPS, backend endpoint, session limits, etc.)

If this is not currently supported without a phone number:

  • What is the closest supported alternative?

  • Is the only option to use the chat widget + callback / phone call flow?

  • Are there plans on your roadmap for a native browser voice widget?

This will help me determine the best deployment approach for my website.

Thank you in advance for the clarification.

Best regards,
Mark Stein