​ To learn more, see the sources I considered: [[1] I’m trying to use a toll-free number (connected from Twilio through a SIP trunk)](https://retell.discourse.group/t/i-m-trying-to-use-a-toll-free-number-connected-from-twilio-through-a-sip-trunk/127) [[2] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) ​

### Answer I'm not able to enable features on your workspace—that's something you'll need to configure yourself or request from Retell support directly. However, you can set up your UK Twilio number with Retell using Elastic SIP Trunking. Here's what you need to do: 1. Configure Twilio Elastic SIP Trunk [(1) ]() - Create an elastic SIP trunk in Twilio with proper termination settings (for outbound) - Set up origination (for inbound) with Retell's SIP server address:

sip:sip.retellai.com

2. Import the Number to Retell - After moving your Twilio number to the elastic SIP trunk, import it to Retell - Supply the termination SIP URI you set up in Twilio - If you configured auth via credentials, provide the username and password as well You can import via the dashboard (Phone Numbers → "Connect via SIP Trunking") or programmatically using the Import Phone Number API: [(2) ]()

javascript
import Retell from 'retell-sdk';
const client = new Retell({
  apiKey: 'YOUR_RETELL_API_KEY',
}) ;
const phoneNumberResponse = await client.phoneNumber.import({
  phone_number: '+447XXXXXXXXX',
  termination_uri: 'someuri.pstn.twilio.com',
}) ;

3. Bind an Inbound Agent - Set the

inbound_agent_id

to your voice agent's ID when importing the number For detailed setup instructions, see: [Import Phone Number]() If you need account-level changes or run into issues, reach out via [Contact Sales]() .

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.