### Answer The "Phone number already exists" error indicates that phone number has already been imported into Retell's system—possibly under a different account or workspace. Possible causes: 1. Number registered under another Retell account — The phone number may have been previously imported by you (perhaps under a different email/workspace) or by someone else. 2. Sign-in method mismatch — Google SSO and email-password sign-in are treated as separate accounts in Retell's system. [(1) ]() If you created an account with one method but are now using another, you might be looking at a different workspace that doesn't show the imported number. What to try: - Check if you have multiple Retell accounts/workspaces (try signing in with Google SSO vs. email-password) - Verify the number isn't already imported in a different workspace within your organization The import endpoint expects the phone number in E.164 format (e.g.,

+14157774444

) along with the

termination_uri

for your Telnyx SIP trunk. [(2) ]() If you're certain the number isn't in any of your accounts, you'll need to contact support@retellai.com to investigate whether it's registered elsewhere in the system.

​ To learn more, see the sources I considered: [[1] Discord message from @trxgames9630 on 2025-12-17](https://discord.com/channels/1186424376300679209/1294891368505937952/1450680465643016278) [[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.

@AI Evy what is the termination_uri?

### Answer The

termination_uri

is the SIP URI used for routing outbound calls from Retell to your telephony provider. [(1) ]() For Telnyx specifically: You'll supply Telnyx's FQDN as the termination SIP URI. You can find your FQDN based on your choice of SIP region in Telnyx's documentation (e.g.,

sip.telnyx.com

) . [(2) ]() When importing your number, you'll also need to provide the username and password you configured in Telnyx's outbound authentication settings. Example import request:

javascript
const phoneNumberResponse = await client.phoneNumber.import({
  phone_number: '+14157774444',
  termination_uri: 'someuri.pstn.twilio.com',
}) ;

[(1) ]() Replace

someuri.pstn.twilio.com

with your Telnyx termination URI (e.g.,

sip.telnyx.com

) .

​ To learn more, see the sources I considered: [[1] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) [[2] Telnyx](https://docs.retellai.com/deploy/telnyx) ​

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