### Answer The issue is that your phone number was imported without the proper E.164 format. Phone numbers must be in E.164 format (+country code, then number with no space, no special characters) , for example

"+14157774444"

. [(1) ]() Since the UI won't let you delete due to the "already exists" error, try using the Update Phone Number API to correct the format. However, note that the path parameter itself requires the number in E.164 format. [(2) ]() Recommended approach: 1. Delete via API — Use the Delete Number API with the number as currently stored (

6786072884

) to remove it 2. Re-import with correct format — Import the number properly in E.164 format:

javascript
import Retell from 'retell-sdk';
const client = new Retell({
  apiKey: 'YOUR_RETELL_API_KEY',
}) ;
const phoneNumberResponse = await client.phoneNumber.import({
  phone_number: '+16786072884',
  termination_uri: 'someuri.pstn.twilio.com',
}) ;
console.log(phoneNumberResponse.inbound_agent_id) ;

[(1) ]() Make sure to: - Include the

+

prefix followed by the country code [(3) ]() - Remove any spaces or special characters from the number If the delete API also fails due to format mismatch, you may need to reach out to support directly: - Visit [Contact Sales]() - Check out [) Would you like me to provide a general answer on alternative approaches?

​ To learn more, see the sources I considered: [[1] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) [[2] Update Phone Number](https://docs.retellai.com/api-references/update-phone-number) [[3] SIP Trunk Outbound Call - No SIP INVITE reaching my server](https://community.retellai.com/t/sip-trunk-outbound-call-no-sip-invite-reaching-my-server/760) ​

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