### Answer Unfortunately, based on previous cases, the Retell AI team has not been able to retrieve deleted agents [(1) ]() . When users have requested restoration of mistakenly deleted agents, the team has attempted recovery but was unsuccessful [(1) ]() [(2) ]() . If you need to attempt recovery anyway, you should reach out to the support team and provide your organization ID and agent ID [(2) ]() . However, based on documented cases, recovery of deleted agents has not been possible [(1) ]() .

​ To learn more, see the sources I considered: [[1] Agent shows in “All Agents” but opening it throws “Resource Not Found” (permission/resource mismatch](https://discord.com/channels/1186424376300679209/1466968187680854077) [[2] Want to Restore a mistakenly deleted voice agent](https://discord.com/channels/1186424376300679209/1434948592128364574) ​

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

### Answer Based on the Twilio 11200 error with HTTP 404 status you're receiving, the webhook URL you're using appears to be incorrect or the endpoint structure may have changed [(1) ]() . According to the platform changelog, SMS functionality was released with specific setup requirements . The 2-Way SMS feature requires you to apply for SMS capability and link your chat agent for 2-way SMS . Key Configuration Steps: For custom SIP trunking numbers with SMS, you need to ensure your number is properly configured with an

inbound_sms_webhook_url

[(2) ]() [(3) ]() . When you import or update a phone number, you can set this webhook URL where Retell will send inbound SMS events . The webhook URL format you mentioned (

<https://api.retellai.com/twilio-sms-webhook/org_(my> org id)

) is not documented in the available sources. Instead, you should configure your own webhook endpoint in the

inbound_sms_webhook_url

field when importing or updating your number . Troubleshooting Steps: 1. Verify your number has

inbound_sms_agents

configured with proper agent bindings 2. Set up your own

inbound_sms_webhook_url

to receive SMS events from Retell 3. Check that your number was properly imported with SMS capabilities enabled [(2) ]() Since the 404 error suggests the endpoint doesn't exist, and this webhook format isn't in the current documentation, I recommend checking if there have been recent changes to the SMS webhook configuration or reaching out to support for the correct webhook URL format for your setup. [Visit Documentation]() , [Hire certified Retell partner]()

, or ask on [Discord]() for real-time assistance with SMS configuration issues.

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

​ To learn more, see the sources I considered: [[1] Platform Changelogs | Retell AI](https://www.retellai.com/changelog) [[2] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) [[3] Update Phone Number](https://docs.retellai.com/api-references/update-phone-number) ​