### Answer The "phone number already exists" error typically means the number is already imported into Retell AI, either in your account or another account. [(1) ]() Here are the steps to resolve this: 1. Check if the number is already in your Retell AI dashboard Go to your Phone Numbers tab in the Retell AI dashboard and verify if the number is already listed there. 2. If you can't see it in your dashboard The number might be imported by another Retell AI account. You can manage phone numbers through the API using the Delete Number API if needed. 3. Verify your Twilio setup Make sure the number is properly assigned to your SIP trunk in Twilio. If the number was previously connected to something else in Twilio or another platform, it may need to be released first. 4. Try a different unassigned number If the issue persists, try using a different Twilio number that hasn't been assigned anywhere else. When importing via SIP trunking, you'll need to provide the termination URI from your Twilio elastic SIP trunk (it typically ends with ".pstn.twilio.com") . [(2) ]() Make sure you've set up both the termination (outbound) and origination (inbound) settings correctly in your Twilio SIP trunk. [(3) ]() If you continue having issues, you can check the [Twilio integration guide]() for detailed setup steps.

​ To learn more, see the sources I considered: [[1] sip trunking](https://discord.com/channels/1186424376300679209/1340050770598559855) [[2] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) [[3] Twilio](https://docs.retellai.com/deploy/twilio) ​

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

### Answer If your Retell phone number list is empty and other numbers work but that specific number doesn't, the number may be registered in another Retell AI organization or workspace. [(1) ]() Here are steps to troubleshoot: 1. Verify the number isn't in another Retell workspace The same phone number cannot be imported into multiple Retell AI accounts or workspaces simultaneously. If you previously used this number in a different workspace or if someone else has imported it, you'll get the "phone number already exists" error. 2. Check your Twilio SIP trunk configuration Ensure the number is properly assigned to your elastic SIP trunk in Twilio and that you're using the correct termination URI (which should end with ".pstn.twilio.com") . Double-check that there are no spaces in the termination SIP URI. 3. Verify E.164 format Make sure you're entering the phone number in E.164 format: +country code, then the number with no spaces or special characters (e.g., "+14157774444") . [(2) ]() 4. Try the API directly You can attempt to import the number programmatically via the Import Number API to see if you get a more specific error message. [(2) ]() [(1) ]() If the issue persists after checking these items, the number may need to be released from a previous Retell AI account before you can import it into yours.

​ To learn more, see the sources I considered: [[1] Twilio](https://docs.retellai.com/deploy/twilio) [[2] 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.

### Answer Since you've tried the standard troubleshooting steps, you can reach out to Retell AI support directly for assistance with this specific phone number issue. Check out these potentially useful sources: - [Twilio]() - [Import Phone Number]() - [Custom Telephony Overview]() I could try to answer generally if you'd like, but for account-specific issues like a phone number that appears to be blocked from import, direct support contact would be most effective in resolving the problem.

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