Twilio Integration

This guide walks you through connecting your Twilio phone numbers using Elastic SIP Trunking. You'll create a SIP trunk in Twilio, assign your numbers to it, and import them into the platform.

Step 1: Create Elastic SIP Trunking

1. Log in to your Twilio Console

2. In the search bar at the top of the dashboard, type "Elastic SIP Trunking" and click the result

   Alternatively, click the "..." menu on the left sidebar for All Products & Services, then scroll down and click Elastic SIP Trunking

3. Click Create new SIP Trunk and give it a Friendly name (e.g., voxlink)

Configure Termination (for outbound calls)

4. In the left sidebar, click Termination

5. In the Termination SIP URI field, enter only a unique name — for example, yourcompany

   Twilio automatically appends .pstn.twilio.com, so your full URI will be: yourcompany.pstn.twilio.com

6. For your SIP trunk to accept outbound requests, you need to set up authentication. Scroll down to Authentication and configure IP Access Control Lists:

   Currently the SIP server does not have a static IP, so you need to whitelist all the IP addresses in the range:

Configure Origination (for inbound calls)

7. In the left sidebar, click Origination

8. Click Add new Origination URI and enter the SIP server address:

   sip:5wed79aeavr.sip.livekit.cloud
   

Step 2: Assign Numbers to Your SIP Trunk

Now assign your Twilio phone numbers to the trunk you just created.

1. In your SIP trunk, click Numbers in the left sidebar
2. Click Add a Number and select the phone number(s) you want to use

Step 3: Import Numbers to the Platform

Now import the number so the platform knows how to route calls.

1. Go directly to the Phone Numbers page in your dashboard:

   https://app.voxlink.ai/phone-numbers

   If it takes you to the login page, log in first — it will automatically redirect you to the Phone Numbers page.

2. Click "Integrate SIP trunk" (top-right corner of the page)

3. Fill in your phone number and SIP credentials:

   Phone number: e.g., +1 555 0123
   Username: Your extension username
   Password: Your extension password
   

4. Enter the Termination SIP URI you created in Step 1:

   Server address: e.g., yourcompany.pstn.twilio.com
   

5. Select the Authorization type. If you configured IP-based authentication in Step 1, select IP and add these addresses:

   54.244.51.0
   54.244.51.1
   54.244.51.2
   54.244.51.3
   54.172.60.0
   54.172.60.1
   54.172.60.2
   54.172.60.3
   

6. Select the country where your SIP trunk is located.

Step 4: Verify Setup

After configuration:

1. Make a test call to your number
2. Check that the AI assistant answers
3. Use the test call feature to verify outbound calling

Security Requirements

Your SIP credentials need to be secure:

• Username: Your extension number or provider-supplied username
• Password must have:
  • 12 or more characters
  • Numbers
  • Upper and lowercase letters
  • Special characters recommended

Common Issues

No. You only create the Elastic SIP Trunk once (Step 1). For each new number, simply assign it to your existing trunk (Step 2) and import it into the platform (Step 3).

- **Check your Termination SIP URI** — make sure there are no spaces and it reads correctly (e.g., `yourcompany.pstn.twilio.com`). Verify you only entered the name part in Twilio and didn't accidentally include a localized URI or duplicate the `.pstn.twilio.com` suffix.
- **Check your username and credentials** — the username is **not** the same as the "Friendly name" in the credential list. Double-check you entered the actual username.

1. In the Twilio Console search bar, search for **"geo"** to find **Voice Geographic Permissions**.

2. Choose **"Elastic SIP Trunking"** in the selector, then select the countries you want to dial.