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Retell AI - Dashboard Setup

Connect your Retell AI conversational agents to Vobiz SIP infrastructure using the visual dashboard interface.

Prefer using API/CLI?

Check out the API-Based Setup Guide for curl commands and programmatic integration.

Overview

This guide shows how to integrate Retell AI with Vobiz using the dashboard to enable outbound calling - your AI agents can call any phone number with natural conversations.

Call flow:

Integration Flow
Your App → Retell AI Agent → Vobiz SIP → Phone Network → AI Conversation

Prerequisites

Before starting:

Step 1: Open Phone Numbers Section

Phone Numbers Screen in Retell Dashboard
  1. Log in to Retell Dashboard
  2. Navigate to Phone Numbers in the sidebar
  3. Click the "+" button to add a new number

Step 2: Select SIP Trunking

Connect via SIP Trunking Option

Select "Connect to your number via SIP trunking"

This option allows you to use your own Vobiz phone number and SIP infrastructure instead of buying a number from Retell.

Step 3: Configure SIP Trunk

SIP Trunk Configuration Form

Required Fields:

Phone Number

Your Vobiz phone number in E.164 format:

Example
+1234567890

Include country code with + prefix

Termination URI

Your Vobiz SIP domain:

Example SIP Domain
abc123.sip.vobiz.ai

⚠️ Do NOT include sip: prefix

SIP Trunk User Name (Optional)

Your Vobiz trunk username:

Example Username
your_username

SIP Trunk Password (Optional)

Your Vobiz trunk password:

Example Password
your_password

Nickname (Optional)

Friendly name for this number (e.g., "Vobiz Main Line")

Where to get Vobiz credentials:

Click Save to complete the configuration.

Your phone number is now configured and ready for outbound calling!

Step 4: Make a Batch Call

Create Batch Call Screen
  1. Click on your configured phone number
  2. Select "Create a batch call"
  3. Fill in the details:
    • Batch Call Name: Name for this campaign (e.g., "Customer Outreach")
    • From number: Select your configured Vobiz number
    • Upload Recipients: Upload CSV file with phone numbers
    • When to send: Choose "Send Now" or "Schedule" for later
  4. Click Send or Schedule

Expected Behavior:

  • Calls initiate to all numbers in CSV
  • AI agent speaks when answered
  • View call logs in Retell Dashboard

CSV Format:

For CSV file format and requirements, see Retell Batch Calling Docs

Dashboard Setup Complete!

Your Retell AI agent can now make outbound calls through Vobiz SIP infrastructure. Perfect for testing and manual campaigns!

Troubleshooting

"Phone number not found"

Problem: Phone number not configured in Retell.

Fix:

  • Verify number format is E.164 (+countrycode + number)
  • Re-configure the phone number in Step 3
  • Check number exists in Vobiz Console

Call fails immediately

Problem: SIP authentication or configuration issue.

Fix:

  • Verify Vobiz username/password at Vobiz Console
  • Must be exact Vobiz domain (e.g., abc123.sip.vobiz.ai)
  • Do NOT include sip: prefix
  • Try different transport type (TCP vs UDP) in trunk config

Insufficient Balance

Problem: Vobiz account has no credits.

Fix:

Agent doesn't speak

Problem: Agent not configured or not published.

Fix:

Need more detailed troubleshooting?

Check the complete troubleshooting guide in the API documentation for more error scenarios and solutions.

Next Steps

  • →
    Customize your agent

    Configure voice, personality, and prompts in Retell Dashboard → Agents

  • →
    View call analytics

    Monitor call logs and transcripts in Retell Dashboard → Calls

  • →
    Automate with API

    Learn to trigger calls programmatically in the API Setup Guide

  • →
    Monitor usage

    Track Vobiz balance and call records

Vapi
Retell AI (API Setup)