dograh/docs/integrations/telephony/telnyx.mdx

---
title: "Telnyx Integration"
description: "Configure Telnyx for voice communication in Dograh AI"
---

## Overview

Telnyx is a cloud communications platform that provides programmable voice via its Call Control API. Dograh AI's Telnyx integration uses Call Control plus WebSocket media streaming to power your voice agents.

## Prerequisites

Before setting up Telnyx integration, you'll need:

- A [Telnyx account](https://telnyx.com/)
- An **API Key** from the Telnyx Mission Control Portal
- A **Call Control Application** (optional — leave the field blank in Dograh and we'll auto-create one for you on save, with the inbound webhook URL pre-set)
- At least one Telnyx phone number assigned to that Call Control Application
- Dograh AI instance running and accessible

## Configuration

### Step 1: Get Telnyx Credentials

1. Log in to the [Telnyx Mission Control Portal](https://portal.telnyx.com/)
2. Navigate to **API Keys** and create (or copy) an API Key
3. (Optional) Navigate to **Call Control** → **Applications** and create (or open) the application you'll use with Dograh, then copy its **Connection ID** (Call Control App ID). Skip this if you want Dograh to auto-create the Call Control Application for you on save.
4. Navigate to **Numbers** → **My Numbers** and assign your phone numbers to the Call Control Application you'll use with Dograh (if you're letting Dograh auto-create the application, do this after saving the configuration in Step 2)

### Step 2: Configure in Dograh AI

1. Navigate to **/telephony-configurations** and click **Add configuration**
2. Select **Telnyx** as your provider
3. Enter your credentials:
   - API Key
   - Call Control App ID (Connection ID) — *optional*. Leave blank and Dograh will auto-create a Call Control Application on save (with the inbound webhook URL already configured) and store its Connection ID on this configuration.
4. Click **Save Configuration**
5. Open the configuration you just created and add at least one **phone number** (with country code in E.164 format, e.g. `+1234567890`). The default caller ID is used for outbound calls.

   <Note>
     If Dograh auto-created the Call Control Application for you, you still
     need to assign your Telnyx numbers to that application in the Telnyx
     Portal under **Numbers** → **My Numbers**. The auto-created application
     is named `dograh-<random>` — its Connection ID is shown on the saved
     configuration.
   </Note>

### Step 3: Test Your Configuration

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

## Inbound Calling Setup

Telnyx delivers inbound webhooks at the **Call Control Application** level — the webhook URL is configured once on the application, and applies to every number assigned to it. **When you save an inbound workflow on a phone number, Dograh automatically pushes the webhook URL to your Call Control Application's `webhook_event_url`** (provided the credentials are correct). If Dograh auto-created the application during configuration save, the webhook URL is already set and this step is a no-op.

### Step 1: Assign an Inbound Workflow to the Phone Number

1. Go to **/telephony-configurations** and open your Telnyx configuration
2. In the **Phone numbers** section, edit the number that should receive inbound calls
3. Set its **Inbound workflow** to the agent that should answer
4. Save

### Step 2: Verify the Webhook URL on the Call Control Application

1. Go to **Call Control** → **Applications** in the Telnyx Portal
2. Open the application whose Connection ID you configured in Dograh
3. In **Webhook Settings**, confirm:
   - **Webhook URL** is set to: `https://api.dograh.com/api/v1/telephony/inbound/run`
   - **HTTP Method** is `POST`
4. Make sure the phone numbers you want to use for inbound are assigned to this application

   <Note>
     Dograh pushed this URL automatically when you saved the inbound workflow
     in Step 1. The same URL is shared across every number on the Call
     Control Application — Dograh matches the inbound call to the right
     agent using the called number's inbound workflow assignment. If the
     field is empty, shows a different URL, or Dograh surfaced a sync
     warning on save, the auto-push failed — most often because the API
     Key or Connection ID in Dograh is incorrect. Paste the URL into the
     field yourself, set the method to `POST`, and save. On self-hosted
     Dograh, replace `api.dograh.com` with your backend domain.
   </Note>

### Step 3: Verify Setup

- Ensure your Dograh AI instance is publicly accessible
- Verify any firewalls allow Telnyx's IP ranges

### Test Inbound Calling

1. Call your configured Telnyx phone number from another phone
2. Verify your Dograh AI voice agent answers and responds
3. Check call logs in both Dograh AI dashboard and Telnyx Portal

## Troubleshooting

<AccordionGroup>
  <Accordion title="Invalid phone number error">
    Ensure phone numbers include country code in E.164 format: `+1234567890`
  </Accordion>

  <Accordion title="Authentication failed">
    - Verify the API Key is correct and active - Check for extra spaces in the
    key - Ensure the key hasn't been revoked in the Telnyx Portal
  </Accordion>

  <Accordion title="Webhook signature validation failing">
    - Telnyx signs webhooks with Ed25519 - confirm the public key on the
    application hasn't changed - Verify the webhook URL matches what Telnyx
    sends - Check if you're behind a proxy that modifies request bodies
  </Accordion>

  <Accordion title="No audio on calls">
    - Verify WebSocket connection is established - Check firewall rules for
    WebSocket traffic - Ensure audio pipeline is configured correctly
  </Accordion>

  <Accordion title="Inbound calls aren't answered">
    - Verify the Call Control Application's webhook URL is set to
    `https://api.dograh.com/api/v1/telephony/inbound/run` - Ensure the webhook
    URL is publicly accessible from the internet - Confirm the called number
    is assigned to the same Call Control Application whose Connection ID is
    configured in Dograh - Confirm the called number exists in your Dograh
    telephony configuration and has an **Inbound workflow** assigned - Verify
    Dograh AI instance is running and responding
  </Accordion>

  <Accordion title="Voice agent doesn't respond to inbound calls">
    - Confirm the phone number has an **Inbound workflow** assigned in
    /telephony-configurations - Verify the API Key matches the one stored in
    your Dograh telephony configuration - Verify WebSocket connection
    establishes successfully - Review call logs for error messages
  </Accordion>
</AccordionGroup>

## Best Practices

- Test your configuration with a single call before running campaigns
- Monitor the Telnyx Portal for usage and billing
- Use a dedicated Call Control Application for Dograh so the shared webhook URL doesn't conflict with other systems