I am trying to set up call forwarding for our Vapi Assistant. I called via phone, not via the web interface. It's a blind transfer. I ensured we use the US Region on Twilio as I remember this being a problem a few months ago. The number I assigned the assistant to (which is the number I called) is a twilio number. The assistant uses the TransferCall tool which returns the result: { "name": "transferCall", "role": "tool_call_result", "time": 1768851902729, "result": "Transfer initiated.", "toolCallId": "call_CNaOeyBYbKy0W0guiWXY2h7p", "secondsFromStart": 37.638 } Here's a call Id from an example: 019bd7c9-7d72-7335-82c8-9f4fa441049e The call ended reason is: "endedReason": "call.in-progress.error-transfer-failed" Could you please support me regarding this?

Hey Timon, the transfer is failing with the error Authenticate, meaning the Twilio credentials are not valid. This is an inbound call. Can you try to make an outbound call from VAPI to check if the credentials are valid?

Okay, that must be it. Just a quick question, were you able to find the error in the call data that I can retrieve via the api as well? Just want to know if I could've spotted this error as well and in which part of the call response I can find it.

yes I found the error in our logs, but that won't be visible in your call Logs because it's an internal log that happened with the internal transfer process.