---
title: Twilio Calling Integration | Sendblue Docs
description: Link your Twilio phone number to Sendblue for outbound voice calls
---

Sendblue integrates with Twilio to enable outbound voice calling from your dashboard. This guide covers how to verify your caller ID and connect it to Sendblue.

## Verify Your Caller ID with Twilio

Before making calls through Sendblue, you must verify your phone number as an outgoing caller ID in Twilio.

### Step 1: Add Your Number in Twilio Console

1. Log in to your [Twilio Console](https://console.twilio.com)
2. Navigate to **Phone Numbers** → **Manage** → **Verified Caller IDs**
3. Click **Add a new Caller ID**
4. Enter your phone number in E.164 format (e.g., `+14155551234`)

### Step 2: Enable Inbound in Sendblue

1. Log in to your [Sendblue dashboard](https://app.sendblue.co)
2. Navigate to settings
3. Enable inbound messaging for your line

This allows Sendblue to receive the verification SMS from Twilio.

### Step 3: Complete Verification

1. In Twilio, when prompted for verification method, select **SMS**
2. Twilio will send a 6-digit verification code via SMS
3. The code will appear in your Sendblue dashboard
4. Enter the code in Twilio to complete verification

For more details, see Twilio’s guide: [How to Add and Remove a Verified Phone Number or Caller ID with Twilio](https://help.twilio.com/articles/223180048-How-to-Add-and-Remove-a-Verified-Phone-Number-or-Caller-ID-with-Twilio)

### Step 4: Make Calls via Twilio API

Once verified, use the Twilio API to make outbound calls with your verified caller ID. See Twilio’s [Voice API documentation](https://www.twilio.com/docs/voice) for implementation details.

### Step 5: Configure Inbound Call Forwarding

To receive inbound calls:

1. Go to your Sendblue settings
2. Configure call forwarding to a Twilio number
3. Incoming calls will now route to your system via Twilio

## Important Notes

- **Twilio powers voice only**: Twilio handles voice calls. SMS, RCS, MMS, and iMessage are all handled by the Sendblue API.
- **E.164 format**: Always use E.164 format for phone numbers (e.g., `+14155551234`).
- **Voice AI agents**: If you want to use your Sendblue number’s caller ID with a third-party voice AI agent, the provider must support Verified Caller IDs. Some providers (e.g., Retell) do not currently support this integration — check with your provider’s documentation.

## Programmatic Verification

If you need to verify multiple numbers, Twilio provides an API for bulk verification. See [Verifying Caller IDs at Scale](https://www.twilio.com/docs/voice/api/verifying-caller-ids-scale) for details.