### Answer To add a Verizon number to Retell AI, you'll need to use Elastic SIP Trunking since Verizon is not a directly integrated provider like Twilio or Telnyx. [(1) ]() Here's the general process: 1. Set up SIP Trunking with a compatible provider You'll need to port or connect your Verizon number to a SIP trunking provider that supports Elastic SIP Trunking (such as Twilio, Telnyx, or Vonage) . 2. Configure your SIP trunk - Set up termination (for outbound calls) with your provider [(2) ]() - Set up origination (for inbound calls) pointing to Retell's SIP server:

sip:sip.retellai.com

[(1) ]() 3. Import the number into Retell Once your number is configured with your SIP trunking provider, import it to Retell using the dashboard or the Import Number API: [(3) ]()

javascript
import Retell from 'retell-sdk';
const client = new Retell({
  apiKey: 'YOUR_RETELL_API_KEY',
}) ;
const phoneNumberResponse = await client.phoneNumber.import({
  phone_number: '+14157774444',
  termination_uri: 'someuri.pstn.twilio.com',
}) ;
console.log(phoneNumberResponse.inbound_agent_id) ;

You'll need to provide the termination URI from your SIP trunking provider, and optionally authentication credentials if required. Transport options supported: TCP (recommended) , UDP, or TLS. [(1) ]() Check out these resources for detailed setup guides: - [Custom Telephony Overview]() - [Twilio SIP Trunking Guide]()

​ To learn more, see the sources I considered: [[1] Custom Telephony Overview](https://docs.retellai.com/deploy/custom-telephony) [[2] Twilio](https://docs.retellai.com/deploy/twilio) [[3] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) ​

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