Phone Numbers

Phone Numbers

Buy a US phone number or connect your own SIP trunk to route inbound calls to your agents.

Option A: Buy a number through HelloAIConnect

The fastest path to a live phone line.

Go to Phone Numbers in the dashboard
Click Buy a Number
Pick any available US number — currently we only support US numbers
Complete checkout (Stripe handles billing — monthly fee charged separately from usage)
Assign the number to an agent using the dropdown on the phone number card

Your agent is now live. Call the number and it will answer within a second.

Numbers are billed monthly as a separate Stripe subscription. Usage (per-minute) is billed on your main plan.

Option B: Connect your own SIP trunk

If you already have a number with Telnyx, Twilio, or another SIP provider, you can route it to HelloAIConnect.

Prerequisites

A SIP trunk from your provider
Outbound SIP credentials (username + password)
The SIP URI of your LiveKit project

Setup steps

In your provider's dashboard, create a SIP trunk pointed at LiveKit's SIP endpoint for your project
In HelloAIConnect, go to Phone Numbers → Connect SIP Trunk
Paste your SIP credentials and save
Assign the trunk to an agent

Detailed provider guides

LiveKit maintains up-to-date guides for each major SIP provider:

Telnyx — LiveKit Telnyx SIP setup
Twilio — LiveKit Twilio SIP setup
General SIP — LiveKit SIP trunk setup

Handling inbound calls

When a call arrives on a number assigned to an agent:

LiveKit's SIP service accepts the call
A LiveKit room is created with the agent's configuration as metadata
The Python agent (running on LiveKit Cloud) joins the room
The agent reads metadata to instantiate the correct LLM/STT/TTS
Conversation begins — transcript + recording are saved to the dashboard

Troubleshooting

No answer when calling — check the agent is active and the phone number is assigned
Call connects but no audio — verify your SIP trunk allows bidirectional audio (RTP) and is not behind a firewall blocking UDP
Call drops mid-conversation — enable failover models on the agent so transient provider errors don't end the call

Next steps

Review call history to see transcripts and recordings
Contact support if you're stuck on SIP configuration

Create Your First Agent

Configure a voice agent with a prompt, model, voice, and optional failover.

Frequently Asked Questions

Answers to common questions about AI voice agents — how they work, pricing, use cases, security, and how to deploy one in minutes with HelloAIConnect.