---
title: "Telephony Integration"
description: "Connect voice agents with telephony providers for inbound and outbound calls"
---

## Overview

Dograh AI's telephony integration system provides a unified interface for connecting with various telephony providers. The same configuration powers both outbound calls (initiated from Dograh) and inbound calls (received on a phone number you own).

## Supported Providers

<CardGroup cols={3}>
  <Card title="Twilio" href="/integrations/telephony/twilio">
    Industry-leading cloud communications platform with global reach
  </Card>
  <Card title="Vonage" href="/integrations/telephony/vonage">
    High-quality voice with 16kHz audio and excellent international coverage
  </Card>
  <Card title="Plivo" href="/integrations/telephony/plivo">
    Cloud communications platform with programmable voice and global PSTN reach
  </Card>
  <Card title="Cloudonix" href="/integrations/telephony/cloudonix">
    SIP-based telephony with flexible trunk configuration
  </Card>
  <Card title="Vobiz" href="/integrations/telephony/vobiz">
    Cloud-based telephony with global reach and competitive pricing
  </Card>
  <Card title="Asterisk ARI" href="/integrations/telephony/asterisk-ari">
    Connect to your own Asterisk PBX via the Asterisk REST Interface
  </Card>
  <Card title="Custom Provider" href="/integrations/telephony/custom">
    Build your own telephony provider integration
  </Card>
</CardGroup>

## Configuration

All telephony providers are configured from a single page in Dograh:

1. Navigate to **/telephony-configurations** and click **Add configuration**
2. Select your provider
3. Enter your credentials and save
4. Open the new configuration and add at least one **phone number**
5. (Optional) Assign an **Inbound workflow** to a phone number to enable inbound calling

<iframe
  className="w-full aspect-video rounded-xl"
  src="https://www.tella.tv/video/setting-up-telephony-configurations-in-dobra-f6zj/embed"
  title="Setting up telephony configurations in Dograh"
  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
  allowFullScreen
></iframe>

A single org can hold multiple configurations (for example, separate Twilio sub-accounts) and multiple phone numbers per configuration. Mark one configuration as the **default outbound** to use it for test calls and campaigns by default.

## Common Features

The telephony integration in Dograh AI supports:

- **Outbound Calls**: Initiate calls to any phone number from a workflow or campaign
- **Inbound Calls**: Route incoming calls to the right voice agent — see the [Inbound Calling guide](/integrations/telephony/inbound)
- **Call Transfer**: Transfer an in-progress call to a human or another number (provider-dependent)
- **Call Status Tracking**: Monitor call lifecycle events (initiated, ringing, answered, completed, failed)
- **WebSocket Audio Streaming**: Real-time, bidirectional audio between caller and agent
- **Webhook Signature Verification**: Inbound webhooks are verified against the matched configuration's credentials

## Inbound Calling

Inbound calls use a **single org-wide webhook URL**:

```
https://api.dograh.com/api/v1/telephony/inbound/run
```

Dograh resolves the org from the webhook's account credentials and the agent from the called number's **Inbound workflow** assignment. See [Inbound Calling](/integrations/telephony/inbound) for the full setup.

## Troubleshooting

<AccordionGroup>
  <Accordion title="Calls not connecting">
    - Verify credentials are correctly configured
    - Check phone number format ([E.164](https://en.wikipedia.org/wiki/E.164) — the international standard: a `+`, then country code, then the number, no spaces or dashes, e.g. `+1234567890`)
    - Ensure webhook URLs are publicly accessible
    - Review provider-specific error logs
  </Accordion>
  
  <Accordion title="Audio quality issues">
    - Check network bandwidth and latency
    - Verify audio codec compatibility
    - Review WebSocket connection stability
  </Accordion>
  
  <Accordion title="Webhook signature validation failing">
    - Confirm auth tokens / API secrets match between provider and Dograh configuration
    - Verify webhook URL matches exactly (including the `/inbound/run` path)
    - Check for proxy or load balancer modifications
  </Accordion>
</AccordionGroup>

## Next Steps

- [Set up your first telephony provider](/integrations/telephony/twilio)
- [Configure inbound calling](/integrations/telephony/inbound)
- [Build a custom provider integration](/integrations/telephony/custom)
