### Answer --- Yes, on February 5, 2025, Retell AI deprecated the V1 APIs and certain deprecated fields in webhooks. [(1) ]() Specifically, the following were deprecated: - V1 APIs and deprecated fields inside APIs - The "data" field inside webhooks - The old Retell legacy dashboard If your system was still using V1 APIs or relying on the deprecated webhook fields, this could have caused calls to fail or not be initiated properly after February 5th. ## Troubleshooting Steps 1. Check if you migrated to V2 APIs – If you were using V1 endpoints, they would have stopped working. 2. Review your webhooks – If your integration relied on the deprecated "data" field inside webhooks, you'll need to update to the new webhook structure. 3. Check call history for disconnection reasons – You can use the List Calls API to check the

disconnection_reason

field for calls with status

not_connected

. [(2) ]() [(3) ]() Common disconnection reasons include: [(2) ]() -

invalid_destination

– destination phone number is invalid -

telephony_provider_permission_denied

– SIP trunk authentication failed -

telephony_provider_unavailable

– telephony provider not available -

dial_failed

– unknown error or SIP error codes not available If you're still experiencing issues, I'd recommend checking your call logs for specific error messages and ensuring your integration has been updated to use the V2 API.

​ To learn more, see the sources I considered: [[1] Platform Changelogs | Retell AI](https://www.retellai.com/changelog) [[2] Debug outbound connection issues](https://docs.retellai.com/reliability/debug-outbound-call) [[3] List Calls](https://docs.retellai.com/api-references/list-calls) ​

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