Vonage Integration

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Overview

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Prerequisites

• A Vonage account
• Vonage Application with Voice capability enabled
• Application ID and Private Key from your Vonage Dashboard
• At least one Vonage phone number
• Dograh AI instance running and accessible

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Video Tutorial

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Configuration

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Step 1: Create Vonage Application

1. Log in to your Vonage Dashboard
2. Navigate to Applications → Create a new application
3. Enable Voice capability
4. Generate a private key (save this securely - you’ll need it)
5. Note your Application ID

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Step 2: Get API Credentials

1. Find your API Key and API Secret in the dashboard under API Settings
2. Navigate to Numbers → Your Numbers
3. Copy your phone number(s)
4. Link your numbers to your application

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Step 3: Configure in Dograh AI

1. Navigate to Workflow → Phone Call → Configure Telephony
2. Watch the Vonage setup video tutorial above for detailed guidance
3. Select Vonage as your provider
4. Enter your credentials:
   • Application ID
   • Private Key (entire key including BEGIN/END lines)
   • API Key (Optional - for some operations)
   • API Secret (Optional - for webhook verification)
   • From Phone Number (without ’+’ prefix, e.g., 14155551234)
5. Click Save Configuration

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Step 4: Test Your Configuration

1. Create a test workflow
2. Click “Test Call” to verify connection
3. Check call logs for successful connection

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How It Works

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Technical Details

• Audio Format: Uses 16kHz Linear PCM (vs Twilio’s 8kHz μ-law)
• Protocol: NCCO (Nexmo Call Control Objects) instead of TwiML
• Authentication: JWT-based authentication using private keys
• WebSocket: Binary audio frames instead of base64-encoded

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Call Flow

1. Dograh AI generates a JWT token using your private key
2. Call is initiated via Vonage Voice API
3. Vonage requests NCCO instructions at the webhook URL
4. Dograh returns WebSocket connection details
5. Audio streams as 16kHz PCM over WebSocket
6. Real-time voice interaction occurs with your agent

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NCCO Response Example

[
  {
    "action": "connect",
    "endpoint": [{
      "type": "websocket",
      "uri": "wss://your-domain/api/v1/telephony/ws/123/456/789",
      "content-type": "audio/l16;rate=16000",
      "headers": {}
    }]
  }
]

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Campaign Features

• Global Reach: Excellent international call quality and coverage
• Number Pool Management: Automatic rotation of configured numbers
• Call Analytics: Detailed metrics via Vonage Dashboard
• Cost Tracking: Per-call cost calculation for billing

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Audio Quality Optimization

• Clearer voice reproduction
• Better speech recognition accuracy
• More natural-sounding TTS output
• Reduced transcription errors

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Troubleshooting

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Best Practices

• Security: Private keys are stored securely in the database
• Testing: Use Vonage Voice Inspector for debugging call issues
• Numbers: Configure multiple numbers for redundancy
• Monitoring: Set up alerts in Vonage Dashboard for failures
• Cost Management: Monitor usage to control costs

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Cost Considerations

• Per-minute charges for calls
• Phone number rental fees
• Optional features (recording, transcription)

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Advanced Configuration

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Custom Headers

# In your webhook response
"headers": {
    "X-Custom-Header": "value",
    "Authorization": "Bearer token"
}

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Call Recording

{
  "action": "record",
  "eventUrl": ["https://your-domain/recording-webhook"],
  "format": "mp3"
}

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API Differences from Twilio

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Next Steps

• Test your Vonage integration with a simple workflow
• Configure VAD settings for optimal voice detection
• Set up monitoring and alerts
• Explore advanced features like call recording