LiveKit Outbound Calling Agent

This project provides a production-ready solution for making outbound AI phone calls using LiveKit and Vobiz SIP trunks. The AI agent can place calls, wait for an answer, and hold a natural conversation with the recipient.

📂 Project Structure

File	Description
agent.py	The main AI worker. It runs in the background, waits for dispatch jobs, and places outbound calls.
make_call.py	A utility script to trigger calls. It dispatches the agent to a unique room with the target phone number.
setup_trunk.py	Script to configure the LiveKit SIP Trunk with Vobiz credentials.
transfer_call.md	Guide for configuring and using SIP transfers.
.env.example	Template for environment variables and secrets.
requirements.txt	List of Python dependencies.

---

🚀 Installation & Setup

1. Prerequisites

Ensure you have the following installed:

• Python 3.9+
• uv (recommended for fast package management) - Install uv

2. LiveKit & Vobiz Credentials

You will need the following accounts:

1. LiveKit Cloud Account: Get your Project URL, API Key, and Secret from cloud.livekit.io.
2. Vobiz Account:
   • Log in to the Vobiz Console Platform.
   • Navigate to your SIP Trunk settings to find:
     • SIP Domain (e.g., xxx.sip.vobiz.ai)
     • Username & Password
   • Get your DID Number (e.g., +91...).
3. OpenAI / Deepgram Keys:
   • OpenAI API Key (for LLM and optional TTS)
   • Deepgram API Key (for STT)

3. Installation Steps

1. Clone/Copy the project to your local machine.

2. Open a terminal in the project folder (livekit-outbound-calls).

3. Install dependencies using uv:

   # Create virtual environment
   uv venv
   
   # Install required packages
   uv pip install -r requirements.txt

4. Configuration

1. Create your env file:

   cp .env.example .env.local

2. Edit .env.local and fill in your keys:

   LIVEKIT_URL=wss://...
   LIVEKIT_API_KEY=...
   LIVEKIT_API_SECRET=...
   OPENAI_API_KEY=...
   DEEPGRAM_API_KEY=...
   
   # SIP Config
   VOBIZ_SIP_DOMAIN=...
   VOBIZ_USERNAME=...
   VOBIZ_PASSWORD=...
   VOBIZ_OUTBOUND_NUMBER=+91...

3. Set Trunk ID in agent.py:
   • If you haven't created a trunk yet, you'll need to create one using the LiveKit CLI or setup script.
   • Once created, get the TRUNK_ID (starts with ST_...).
   • Open agent.py and update line 25:

     OUTBOUND_TRUNK_ID = "ST_xxxxxxxxx"

---

📞 How to Use

Step 1: Start the Background Agent

Open a PowerShell terminal and run:

uv run python agent.py start

• Wait until you see the message: INFO:livekit.agents:registered worker ...
• Keep this terminal open. This agent will listen for call requests.

Step 2: Make a Call

Open a separate terminal window (keep the first one running) and run:

uv run python make_call.py --to +919988776655 (your number)

(Replace +919988776655 with the actual number you want to call)

What Happens Next?

1. make_call.py sends a "dispatch" request to LiveKit.
2. LiveKit assigns the job to your running agent.py.
3. The agent joins a secure room (e.g., call-9148...).
4. The agent dials the phone number via the Vobiz SIP trunk.
5. When the user answers, the agent will start listening and speaking.
6. Call Transfer: You can ask the agent to transfer you.
   • Default: "Transfer me." -> Transfers to the configured default number.
   • Custom: "Transfer me to +1..." -> Transfers to the specific number.
   • For detailed setup and troubleshooting, see transfer_call.md.

---

🛠️ Troubleshooting

• Agent not starting?

  • Check .env.local is correct.
  • Ensure dependencies are installed (uv pip install ...).

• Call not connecting?

  • Check OUTBOUND_TRUNK_ID in agent.py.
  • Verify your Vobiz SIP credentials and balance.
  • Ensure the phone number includes the country code (e.g., +91).

• No audio?

  • Check OpenAI/Deepgram API keys.
  • Check the agent logs for errors.